Decimal.Explicit 操作员

定义

命名空间:: System

程序集:: mscorlib.dll, System.Runtime.dll

程序集:: netstandard.dll, System.Runtime.dll

程序集:: System.Runtime.dll

程序集:: mscorlib.dll

程序集:: netstandard.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

定义对象与另一种类型的显式转换 Decimal 。

重载

名称	说明
Explicit(Single to Decimal)	定义单精度浮点数到 a 的 Decimal显式转换。
Explicit(Double to Decimal)	定义双精度浮点数到 a Decimal的显式转换。
Explicit(Decimal to UInt64)	定义到 64 位无符号整数的 Decimal 显式转换。此 API 不符合 CLS。
Explicit(Decimal to UInt32)	定义到 32 位无符号整数的 Decimal 显式转换。此 API 不符合 CLS。
Explicit(Decimal to UInt16)	定义到 16 位无符号整数的 Decimal 显式转换。此 API 不符合 CLS。
Explicit(Decimal to SByte)	定义到 8 位有符号整数的 Decimal 显式转换。此 API 不符合 CLS。
Explicit(Decimal to Single)	定义到单精度浮点数的 Decimal 显式转换。
Explicit(Decimal to Int32)	定义到 32 位有符号整数的 Decimal 显式转换。
Explicit(Decimal to Int16)	定义到 16 位有符号整数的 Decimal 显式转换。
Explicit(Decimal to Double)	定义对双精度浮点数的 Decimal 显式转换。
Explicit(Decimal to Char)	定义对 Unicode 字符的 Decimal 显式转换。
Explicit(Decimal to Byte)	定义到 8 位无符号整数的 Decimal 显式转换。
Explicit(Decimal to Int64)	定义到 64 位有符号整数的 Decimal 显式转换。

Explicit(Single to Decimal)

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

定义单精度浮点数到 a 的 Decimal显式转换。

public:
 static explicit operator System::Decimal(float value);

public static explicit operator decimal(float value);

static member op_Explicit : single -> decimal

Public Shared Narrowing Operator CType (value As Single) As Decimal

参数

value: Single

要转换的单精度浮点数。

Decimal

转换的单精度浮点数。

例外

OverflowException

value 大于 Decimal.MaxValue 或小于 Decimal.MinValue。

-或-

value 是 NaN， PositiveInfinity或 NegativeInfinity。

示例

以下示例使用Single转换Decimal Single运算符将值转换为Decimal数字。此转换需要Visual Basic中的 op_Explicit 运算符。

// Example of the explicit conversion from float to decimal.
using System;

class DecimalFromSingleDemo
{
    const string formatter = "{0,16:E7}{1,33}";

    // Get the exception type name; remove the namespace prefix.
    public static string GetExceptionType( Exception ex )
    {
        string exceptionType = ex.GetType( ).ToString( );
        return exceptionType.Substring(
            exceptionType.LastIndexOf( '.' ) + 1 );
    }

    // Convert the float argument; catch exceptions that are thrown.
    public static void DecimalFromSingle( float argument )
    {
        object decValue;

        // Convert the float argument to a decimal value.
        try
        {
            decValue = (decimal)argument;
        }
        catch( Exception ex )
        {
            decValue = GetExceptionType( ex );
        }

        Console.WriteLine( formatter, argument, decValue );
    }

    public static void Main( )
    {
        Console.WriteLine(
            "This example of the explicit conversion from float " +
            "to decimal \ngenerates the following output.\n" );
        Console.WriteLine( formatter, "float argument",
            "decimal value" );
        Console.WriteLine( formatter, "--------------",
            "-------------" );

        // Convert float values and display the results.
        DecimalFromSingle( 1.2345E-30F );
        DecimalFromSingle( 1.2345E-26F );
        DecimalFromSingle( 1.23456E-22F );
        DecimalFromSingle( 1.23456E-12F );
        DecimalFromSingle( 1.234567F );
        DecimalFromSingle( 1.234567E+12F );
        DecimalFromSingle( 1.2345678E+28F );
        DecimalFromSingle( 1.2345678E+30F );
    }
}

/*
This example of the explicit conversion from float to decimal
generates the following output.

  float argument                    decimal value
  --------------                    -------------
  1.2345000E-030                                0
  1.2345000E-026   0.0000000000000000000000000123
  1.2345600E-022    0.000000000000000000000123456
  1.2345600E-012              0.00000000000123456
  1.2345671E+000                         1.234567
  1.2345670E+012                    1234567000000
  1.2345678E+028    12345680000000000000000000000
  1.2345678E+030                OverflowException
*/

// Example of the explicit conversion from float to decimal.
let print obj1 obj2 = printfn $"{obj1,16:E7}{obj2,33}"

// Get the exception type name; remove the namespace prefix.
let getExceptionType (ex: exn) =
    let exceptionType = ex.GetType() |> string
    exceptionType.Substring(exceptionType.LastIndexOf '.' + 1)

// Convert the float argument; catch exceptions that are thrown.
let decimalFromSingle (argument: float32) =
    // Convert the float argument to a decimal value.
    try
        decimal argument
        |> print argument
    with ex ->
        getExceptionType ex
        |> print argument

printfn "This example of the explicit conversion from float to decimal \ngenerates the following output.\n"
print "float argument" "decimal value"
print "--------------" "-------------"

// Convert float values and display the results.
decimalFromSingle 1.2345E-30f
decimalFromSingle 1.2345E-26f
decimalFromSingle 1.23456E-22f
decimalFromSingle 1.23456E-12f
decimalFromSingle 1.234567f
decimalFromSingle 1.234567E+12f
decimalFromSingle 1.2345678E+28f
decimalFromSingle 1.2345678E+30f


// This example of the explicit conversion from float to decimal
// generates the following output.
//
//   float argument                    decimal value
//   --------------                    -------------
//   1.2345000E-030                                0
//   1.2345000E-026   0.0000000000000000000000000123
//   1.2345600E-022    0.000000000000000000000123456
//   1.2345600E-012              0.00000000000123456
//   1.2345671E+000                         1.234567
//   1.2345670E+012                    1234567000000
//   1.2345678E+028    12345680000000000000000000000
//   1.2345678E+030                OverflowException

' Example of the explicit conversion from Single to Decimal.
Module DecimalFromSingleDemo

    Const formatter As String = "{0,16:E7}{1,33}"
 
    ' Get the exception type name; remove the namespace prefix.
    Function GetExceptionType( ex As Exception ) As String

        Dim exceptionType   As String = ex.GetType( ).ToString( )
        Return exceptionType.Substring( _
            exceptionType.LastIndexOf( "."c ) + 1 )
    End Function

    ' Convert the Single argument; catch exceptions that are thrown.
    Sub DecimalFromSingle( argument As Single )

        Dim decValue    As Object
          
        ' Convert the Single argument to a Decimal value.
        Try
            decValue = Decimal.op_Explicit( argument )
        Catch ex As Exception
            decValue = GetExceptionType( ex )
        End Try

        ' Display the Decimal.
        Console.WriteLine( formatter, argument, decValue )
    End Sub 
       
    Sub Main( )

        Console.WriteLine( _
            "This example of the explicit conversion from Single " & _
            "to Decimal " & vbCrLf & "generates the following " & _
            "output." & vbCrLf )
        Console.WriteLine( formatter, "Single argument", _
            "Decimal value" )
        Console.WriteLine( formatter, "---------------", _
            "-------------" )
          
        ' Convert Single values and display the results.
        DecimalFromSingle( 1.2345E-30 )
        DecimalFromSingle( 1.2345E-26 )
        DecimalFromSingle( 1.23456E-22 )
        DecimalFromSingle( 1.23456E-12 )
        DecimalFromSingle( 1.234567 )
        DecimalFromSingle( 1.234567E+12 )
        DecimalFromSingle( 1.2345678E+28 ) 
        DecimalFromSingle( 1.2345678E+30 )
    End Sub 
End Module

' This example of the explicit conversion from Single to Decimal
' generates the following output.
' 
'  Single argument                    Decimal value
'  ---------------                    -------------
'   1.2345000E-030                                0
'   1.2345000E-026   0.0000000000000000000000000123
'   1.2345600E-022    0.000000000000000000000123456
'   1.2345600E-012              0.00000000000123456
'   1.2345671E+000                         1.234567
'   1.2345670E+012                    1234567000000
'   1.2345678E+028    12345680000000000000000000000
'   1.2345678E+030                OverflowException

另请参阅

Single

适用于

Explicit(Double to Decimal)

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

定义双精度浮点数到 a Decimal的显式转换。

public:
 static explicit operator System::Decimal(double value);

public static explicit operator decimal(double value);

static member op_Explicit : double -> decimal

Public Shared Narrowing Operator CType (value As Double) As Decimal

参数

value: Double

要转换的双精度浮点数。

Decimal

转换后的双精度浮点数。

例外

OverflowException

value 大于 Decimal.MaxValue 或小于 Decimal.MinValue。

-或-

value 是 NaN， PositiveInfinity或 NegativeInfinity。

示例

以下示例使用Double转换Decimal Double运算符将值转换为Decimal数字。此转换需要Visual Basic中的 op_Explicit 运算符。

// Example of the explicit conversion from double to decimal.
using System;

class DecimalFromDoubleDemo
{
    const string formatter = "{0,25:E16}{1,33}";

    // Get the exception type name; remove the namespace prefix.
    public static string GetExceptionType( Exception ex )
    {
        string exceptionType = ex.GetType( ).ToString( );
        return exceptionType.Substring(
            exceptionType.LastIndexOf( '.' ) + 1 );
    }

    // Convert the double argument; catch exceptions that are thrown.
    public static void DecimalFromDouble( double argument )
    {
        object decValue;

        // Convert the double argument to a decimal value.
        try
        {
            decValue = (decimal)argument;
        }
        catch( Exception ex )
        {
            decValue = GetExceptionType( ex );
        }

        Console.WriteLine( formatter, argument, decValue );
    }

    public static void Main( )
    {
        Console.WriteLine(
            "This example of the explicit conversion from double " +
            "to decimal \ngenerates the following output.\n" );
        Console.WriteLine( formatter, "double argument",
            "decimal value" );
        Console.WriteLine( formatter, "---------------",
            "-------------" );

        // Convert double values and display the results.
        DecimalFromDouble( 1.234567890123E-30 );
        DecimalFromDouble( 1.2345678901234E-25 );
        DecimalFromDouble( 1.23456789012345E-20 );
        DecimalFromDouble( 1.234567890123456E-10 );
        DecimalFromDouble( 1.2345678901234567 );
        DecimalFromDouble( 1.23456789012345678E+12 );
        DecimalFromDouble( 1.234567890123456789E+28 );
        DecimalFromDouble( 1.234567890123456789E+30 );
    }
}

/*
This example of the explicit conversion from double to decimal
generates the following output.

          double argument                    decimal value
          ---------------                    -------------
  1.2345678901230000E-030                                0
  1.2345678901233999E-025   0.0000000000000000000000001235
  1.2345678901234499E-020   0.0000000000000000000123456789
  1.2345678901234560E-010       0.000000000123456789012346
  1.2345678901234567E+000                 1.23456789012346
  1.2345678901234568E+012                 1234567890123.46
  1.2345678901234568E+028    12345678901234600000000000000
  1.2345678901234569E+030                OverflowException
*/

// Example of the explicit conversion from double to decimal.
let print obj1 obj2 = printfn $"{obj1,25:E16}{obj2,33}"

// Get the exception type name; remove the namespace prefix.
let getExceptionType (ex: exn) =
    let exceptionType = ex.GetType() |> string
    exceptionType.Substring(exceptionType.LastIndexOf '.' + 1)

// Convert the double argument; catch exceptions that are thrown.
let decimalFromDouble (argument: double) =
    // Convert the double argument to a decimal value.
    try
        decimal argument
        |> print argument
    with ex ->
        getExceptionType ex
        |> print argument


printfn "This example of the explicit conversion from double to decimal \ngenerates the following output.\n"
print "double argument" "decimal value"
print "---------------" "-------------"

// Convert double values and display the results.
decimalFromDouble 1.234567890123E-30
decimalFromDouble 1.2345678901234E-25
decimalFromDouble 1.23456789012345E-20
decimalFromDouble 1.234567890123456E-10
decimalFromDouble 1.2345678901234567
decimalFromDouble 1.23456789012345678E+12
decimalFromDouble 1.234567890123456789E+28
decimalFromDouble 1.234567890123456789E+30


// This example of the explicit conversion from double to decimal
// generates the following output.

//           double argument                    decimal value
//           ---------------                    -------------
//   1.2345678901230000E-030                                0
//   1.2345678901233999E-025   0.0000000000000000000000001235
//   1.2345678901234499E-020   0.0000000000000000000123456789
//   1.2345678901234560E-010       0.000000000123456789012346
//   1.2345678901234567E+000                 1.23456789012346
//   1.2345678901234568E+012                 1234567890123.46
//   1.2345678901234568E+028    12345678901234600000000000000
//   1.2345678901234569E+030                OverflowException

' Example of the explicit conversion from Double to Decimal.
Module DecimalFromDoubleDemo

    Const formatter As String = "{0,25:E16}{1,33}"
 
    ' Get the exception type name; remove the namespace prefix.
    Function GetExceptionType( ex As Exception ) As String

        Dim exceptionType   As String = ex.GetType( ).ToString( )
        Return exceptionType.Substring( _
            exceptionType.LastIndexOf( "."c ) + 1 )
    End Function

    ' Convert the Double argument; catch exceptions that are thrown.
    Sub DecimalFromDouble( argument As Double )

        Dim decValue    As Object
          
        ' Convert the Double argument to a Decimal value.
        Try
            decValue = Decimal.op_Explicit( argument )
        Catch ex As Exception
            decValue = GetExceptionType( ex )
        End Try

        ' Display the Decimal.
        Console.WriteLine( formatter, argument, decValue )
    End Sub 
       
    Sub Main( )

        Console.WriteLine( _
            "This example of the explicit conversion from Double " & _
            "to Decimal " & vbCrLf & "generates the following " & _
            "output." & vbCrLf )
        Console.WriteLine( formatter, "Double argument", _
            "Decimal value" )
        Console.WriteLine( formatter, "---------------", _
            "-------------" )
          
        ' Convert Double values and display the results.
        DecimalFromDouble( 1.234567890123E-30 )
        DecimalFromDouble( 1.2345678901234E-25 )
        DecimalFromDouble( 1.23456789012345E-20 )
        DecimalFromDouble( 1.234567890123456E-10 )
        DecimalFromDouble( 1.2345678901234567 )
        DecimalFromDouble( 1.23456789012345678E+12 )
        DecimalFromDouble( 1.234567890123456789E+28 ) 
        DecimalFromDouble( 1.234567890123456789E+30 )
    End Sub 
End Module

' This example of the explicit conversion from Double to Decimal
' generates the following output.
'
'           Double argument                    Decimal value
'           ---------------                    -------------
'   1.2345678901230000E-030                                0
'   1.2345678901233999E-025   0.0000000000000000000000001235
'   1.2345678901234499E-020   0.0000000000000000000123456789
'   1.2345678901234560E-010       0.000000000123456789012346
'   1.2345678901234567E+000                 1.23456789012346
'   1.2345678901234568E+012                 1234567890123.46
'   1.2345678901234568E+028    12345678901234600000000000000
'   1.2345678901234569E+030                OverflowException

另请参阅

Double

适用于

Explicit(Decimal to UInt64)

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

重要

此 API 不符合 CLS。

定义到 64 位无符号整数的 Decimal 显式转换。

此 API 不符合 CLS。

public:
 static explicit operator System::UInt64(System::Decimal value);

[System.CLSCompliant(false)]
public static explicit operator ulong(decimal value);

[<System.CLSCompliant(false)>]
static member op_Explicit : decimal -> uint64

Public Shared Narrowing Operator CType (value As Decimal) As ULong

参数

value: Decimal

要转换的值。

UInt64

一个表示已 Decimal转换的 64 位无符号整数。

属性: CLSCompliantAttribute

例外

OverflowException

value 为负或大于 UInt64.MaxValue。

示例

以下示例使用显式Decimal到UInt64转换运算符将数字转换为Decimal UInt64值。

// Example of the explicit conversions from decimal to long and
// decimal to ulong.
using System;

class DecimalToU_Int64Demo
{
    const string formatter = "{0,25}{1,22}{2,22}";

    // Get the exception type name; remove the namespace prefix.
    public static string GetExceptionType( Exception ex )
    {
        string exceptionType = ex.GetType( ).ToString( );
        return exceptionType.Substring(
            exceptionType.LastIndexOf( '.' ) + 1 );
    }

    // Convert the decimal argument; catch exceptions that are thrown.
    public static void DecimalToU_Int64( decimal argument )
    {
        object Int64Value;
        object UInt64Value;

        // Convert the argument to a long value.
        try
        {
            Int64Value = (long)argument;
        }
        catch( Exception ex )
        {
            Int64Value = GetExceptionType( ex );
        }

        // Convert the argument to a ulong value.
        try
        {
            UInt64Value = (ulong)argument;
        }
        catch( Exception ex )
        {
            UInt64Value = GetExceptionType( ex );
        }

        Console.WriteLine( formatter, argument,
            Int64Value, UInt64Value );
    }

    public static void Main( )
    {
        Console.WriteLine(
            "This example of the explicit conversions from decimal " +
            "to long \nand decimal to ulong generates the following " +
            "output. It displays \nseveral converted decimal " +
            "values.\n" );
        Console.WriteLine( formatter, "decimal argument",
            "long/exception", "ulong/exception" );
        Console.WriteLine( formatter, "----------------",
            "--------------", "---------------" );

        // Convert decimal values and display the results.
        DecimalToU_Int64( 123M );
        DecimalToU_Int64( new decimal( 123000, 0, 0, false, 3 ) );
        DecimalToU_Int64( 123.999M );
        DecimalToU_Int64( 18446744073709551615.999M );
        DecimalToU_Int64( 18446744073709551616M );
        DecimalToU_Int64( 9223372036854775807.999M );
        DecimalToU_Int64( 9223372036854775808M );
        DecimalToU_Int64( - 0.999M );
        DecimalToU_Int64( - 1M );
        DecimalToU_Int64( - 9223372036854775808.999M );
        DecimalToU_Int64( - 9223372036854775809M );
    }
}

/*
This example of the explicit conversions from decimal to long
and decimal to ulong generates the following output. It displays
several converted decimal values.

         decimal argument        long/exception       ulong/exception
         ----------------        --------------       ---------------
                      123                   123                   123
                  123.000                   123                   123
                  123.999                   123                   123
 18446744073709551615.999     OverflowException  18446744073709551615
     18446744073709551616     OverflowException     OverflowException
  9223372036854775807.999   9223372036854775807   9223372036854775807
      9223372036854775808     OverflowException   9223372036854775808
                   -0.999                     0                     0
                       -1                    -1     OverflowException
 -9223372036854775808.999  -9223372036854775808     OverflowException
     -9223372036854775809     OverflowException     OverflowException
*/

// Example of the explicit conversions from decimal to long and
// decimal to ulong.
let print obj1 obj2 obj3 = printfn $"{obj1,25}{obj2,22}{obj3,22}"

// Get the exception type name; remove the namespace prefix.
let getExceptionType (ex: exn) =
    let exceptionType = ex.GetType() |> string
    exceptionType.Substring(exceptionType.LastIndexOf '.' + 1)

// Convert the decimal argument; catch exceptions that are thrown.
let decimalToU_Int64 (argument: decimal) =
    let int32Value: obj =
        // Convert the argument to a int64 value.
        try
            int32 argument
        with ex -> getExceptionType ex

    let uint32Value: obj =
        // Convert the argument to a uint64 value.
        try
            uint32 argument
        with ex -> getExceptionType ex

    print argument int32Value uint32Value

printfn "This example of the explicit conversions from decimal to long\nand decimal to ulong generates the following output. It displays\nseveral converted decimal values.\n"

print "decimal argument" "long/exception" "ulong/exception"
print "----------------" "--------------" "---------------"

// Convert decimal values and display the results.
decimalToU_Int64 123M
decimalToU_Int64 (new decimal(123000, 0, 0, false, 3uy))
decimalToU_Int64 123.999M
decimalToU_Int64 18446744073709551615.999M
decimalToU_Int64 18446744073709551616M
decimalToU_Int64 9223372036854775807.999M
decimalToU_Int64 9223372036854775808M
decimalToU_Int64 -0.999M
decimalToU_Int64 -1M
decimalToU_Int64 -9223372036854775808.999M
decimalToU_Int64 -9223372036854775809M


// This example of the explicit conversions from decimal to long
// and decimal to ulong generates the following output. It displays
// several converted decimal values.
//
//          decimal argument        long/exception       ulong/exception
//          ----------------        --------------       ---------------
//                       123                   123                   123
//                   123.000                   123                   123
//                   123.999                   123                   123
//  18446744073709551615.999     OverflowException  18446744073709551615
//      18446744073709551616     OverflowException     OverflowException
//   9223372036854775807.999   9223372036854775807   9223372036854775807
//       9223372036854775808     OverflowException   9223372036854775808
//                    -0.999                     0                     0
//                        -1                    -1     OverflowException
//  -9223372036854775808.999  -9223372036854775808     OverflowException
//      -9223372036854775809     OverflowException     OverflowException

' Example of the explicit conversions from Decimal to Long and 
' Decimal to ULong.
Module DecimalToU_Int64Demo

    Const formatter As String = "{0,25}{1,22}{2,22}"

    ' Convert the decimal argument catch exceptions that are thrown.
    Public Sub DecimalToU_Int64(argument As Decimal)
        Dim Int64Value As Object
        Dim UInt64Value As Object

        ' Convert the argument to a long value.
        Try
            Int64Value = CLng(argument)
        Catch ex As Exception
            Int64Value = ex.GetType().Name
        End Try

        ' Convert the argument to a ulong value.
        Try
            UInt64Value = CULng(argument)
        Catch ex As Exception
            UInt64Value = ex.GetType().Name
        End Try

        Console.WriteLine(formatter, argument, _ 
            Int64Value, UInt64Value)
    End Sub

    Public Sub Main( )
        Console.WriteLine( formatter, "Decimal argument", _
            "Long/Exception", "ULong/Exception" )
        Console.WriteLine( formatter, "----------------", _
            "--------------", "---------------" )

        ' Convert decimal values and display the results.
        DecimalToU_Int64(123d)
        DecimalToU_Int64(New Decimal(123000, 0, 0, False, 3))
        DecimalToU_Int64(123.999d)
        DecimalToU_Int64(18446744073709551615.999d)
        DecimalToU_Int64(18446744073709551616d)
        DecimalToU_Int64(9223372036854775807.999d)
        DecimalToU_Int64(9223372036854775808d)
        DecimalToU_Int64(-0.999d)
        DecimalToU_Int64(-1d)
        DecimalToU_Int64(-9223372036854775808.999d)
        DecimalToU_Int64(-9223372036854775809d)
    End Sub
End Module
' The example displays the following output to the console:
'             Decimal argument        Long/Exception       ULong/Exception
'             ----------------        --------------       ---------------
'                          123                   123                   123
'                      123.000                   123                   123
'                      123.999                   124                   124
'     18446744073709551615.999     OverflowException     OverflowException
'         18446744073709551616     OverflowException     OverflowException
'      9223372036854775807.999     OverflowException   9223372036854775808
'          9223372036854775808     OverflowException   9223372036854775808
'                       -0.999                    -1     OverflowException
'                           -1                    -1     OverflowException
'     -9223372036854775808.999     OverflowException     OverflowException
'         -9223372036854775809     OverflowException     OverflowException

注解

此运算符支持显式转换为 Decimal a UInt64. 此类显式转换的语法依赖于语言，各个语言编译器可以提供不同的实现并返回不同的结果。该示例演示了在使用 C# 和 Visual Basic 将 Decimal 值显式转换为 UInt64 值时的不同返回值。若要执行独立于语言的转换，可以调用 Decimal.ToUInt64(Decimal) 或 Convert.ToUInt64(Decimal) 方法。

另请参阅

UInt64

适用于

Explicit(Decimal to UInt32)

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

重要

此 API 不符合 CLS。

符合 CLS 的替代方案: System.Decimal.ToInt64(Decimal)

定义到 32 位无符号整数的 Decimal 显式转换。

此 API 不符合 CLS。

public:
 static explicit operator System::UInt32(System::Decimal value);

[System.CLSCompliant(false)]
public static explicit operator uint(decimal value);

[<System.CLSCompliant(false)>]
static member op_Explicit : decimal -> uint32

Public Shared Narrowing Operator CType (value As Decimal) As UInteger

参数

value: Decimal

要转换的值。

UInt32

一个表示已 Decimal转换的 32 位无符号整数。

属性: CLSCompliantAttribute

例外

OverflowException

value 小于 UInt32.MinValue 或大于 UInt32.MaxValue。

示例

以下示例使用显式Decimal到UInt32转换运算符将数字转换为Decimal UInt32值。

// Example of the explicit conversions from decimal to int and
// decimal to uint.
using System;

class DecimalToU_Int32Demo
{
    const string formatter = "{0,17}{1,19}{2,19}";

    // Get the exception type name; remove the namespace prefix.
    public static string GetExceptionType( Exception ex )
    {
        string exceptionType = ex.GetType( ).ToString( );
        return exceptionType.Substring(
            exceptionType.LastIndexOf( '.' ) + 1 );
    }

    // Convert the decimal argument; catch exceptions that are thrown.
    public static void DecimalToU_Int32( decimal argument )
    {
        object Int32Value;
        object UInt32Value;

        // Convert the argument to an int value.
        try
        {
            Int32Value = (int)argument;
        }
        catch( Exception ex )
        {
            Int32Value = GetExceptionType( ex );
        }

        // Convert the argument to a uint value.
        try
        {
            UInt32Value = (uint)argument;
        }
        catch( Exception ex )
        {
            UInt32Value = GetExceptionType( ex );
        }

        Console.WriteLine( formatter, argument,
            Int32Value, UInt32Value );
    }

    public static void Main( )
    {
        Console.WriteLine(
            "This example of the explicit conversions from decimal " +
            "to int \nand decimal to uint generates the following " +
            "output. It displays \nseveral converted decimal " +
            "values.\n" );
        Console.WriteLine( formatter, "decimal argument",
            "int/exception", "uint/exception" );
        Console.WriteLine( formatter, "----------------",
            "-------------", "--------------" );

        // Convert decimal values and display the results.
        DecimalToU_Int32( 123M );
        DecimalToU_Int32( new decimal( 123000, 0, 0, false, 3 ) );
        DecimalToU_Int32( 123.999M );
        DecimalToU_Int32( 4294967295.999M );
        DecimalToU_Int32( 4294967296M );
        DecimalToU_Int32( 2147483647.999M );
        DecimalToU_Int32( 2147483648M );
        DecimalToU_Int32( - 0.999M );
        DecimalToU_Int32( - 1M );
        DecimalToU_Int32( - 2147483648.999M );
        DecimalToU_Int32( - 2147483649M );
    }
}

/*
This example of the explicit conversions from decimal to int
and decimal to uint generates the following output. It displays
several converted decimal values.

 decimal argument      int/exception     uint/exception
 ----------------      -------------     --------------
              123                123                123
          123.000                123                123
          123.999                123                123
   4294967295.999  OverflowException         4294967295
       4294967296  OverflowException  OverflowException
   2147483647.999         2147483647         2147483647
       2147483648  OverflowException         2147483648
           -0.999                  0                  0
               -1                 -1  OverflowException
  -2147483648.999        -2147483648  OverflowException
      -2147483649  OverflowException  OverflowException
*/

// Example of the explicit conversions from decimal to int and
// decimal to uint.
let print obj1 obj2 obj3 = printfn $"{obj1,17}{obj2,19}{obj3,19}"

// Get the exception type name; remove the namespace prefix.
let getExceptionType (ex: exn) =
    let exceptionType = ex.GetType() |> string
    exceptionType.Substring(exceptionType.LastIndexOf '.' + 1)

// Convert the decimal argument; catch exceptions that are thrown.
let decimalToU_Int32 (argument: decimal) =
    let int32Value: obj =
        // Convert the argument to a int32 value.
        try
            int32 argument
        with ex -> getExceptionType ex

    let uint32Value: obj =
        // Convert the argument to a uint32 value.
        try
            uint32 argument
        with ex -> getExceptionType ex

    print argument int32Value uint32Value

printfn "This example of the explicit conversions from decimal to int\nand decimal to uint generates the following output. It displays\nseveral converted decimal values.\n"

print "decimal argument" "int/exception" "uint/exception"
print "----------------" "-------------" "--------------" 

// Convert decimal values and display the results.
decimalToU_Int32 123M
decimalToU_Int32 (new decimal(123000, 0, 0, false, 3uy))
decimalToU_Int32 123.999M
decimalToU_Int32 4294967295.999M
decimalToU_Int32 4294967296M
decimalToU_Int32 2147483647.999M
decimalToU_Int32 2147483648M
decimalToU_Int32 -0.999M
decimalToU_Int32 -1M
decimalToU_Int32 -2147483648.999M
decimalToU_Int32 -2147483649M


// This example of the explicit conversions from decimal to int
// and decimal to uint generates the following output. It displays
// several converted decimal values.
//
//  decimal argument      int/exception     uint/exception
//  ----------------      -------------     --------------
//               123                123                123
//           123.000                123                123
//           123.999                123                123
//    4294967295.999  OverflowException         4294967295
//        4294967296  OverflowException  OverflowException
//    2147483647.999         2147483647         2147483647
//        2147483648  OverflowException         2147483648
//            -0.999                  0                  0
//                -1                 -1  OverflowException
//   -2147483648.999        -2147483648  OverflowException
//       -2147483649  OverflowException  OverflowException

' Example of the explicit conversions from Decimal to Integer and 
' Decimal to UInteger.
Module DecimalToU_Int32Demo

    Const formatter As String = "{0,17}{1,19}{2,19}"

    ' Convert the decimal argument catch exceptions that are thrown.
    Public Sub DecimalToU_Int32(argument As Decimal)
        Dim Int32Value As Object
        Dim UInt32Value As Object

        ' Convert the argument to an int value.
        Try
            Int32Value = CInt(argument)
        Catch ex As Exception 
            Int32Value = ex.GetType().Name
        End Try

        ' Convert the argument to a uint value.
        Try
            UInt32Value = CUInt(argument)
        Catch ex As Exception
            UInt32Value = ex.GetType().Name
        End Try

        Console.WriteLine(formatter, argument, _
            Int32Value, UInt32Value)
    End Sub

    Public Sub Main( )
        Console.WriteLine( formatter, "Decimal Argument", _ 
            "Integer/Exception", "UInteger/Exception" )
        Console.WriteLine( formatter, "----------------", _ 
            "-------------", "--------------" )

        ' Convert decimal values and display the results.
        DecimalToU_Int32( 123d)
        DecimalToU_Int32(New Decimal(123000, 0, 0, False, 3))
        DecimalToU_Int32(123.999d)
        DecimalToU_Int32(4294967295.999d)
        DecimalToU_Int32(4294967296d)
        DecimalToU_Int32(2147483647.999d)
        DecimalToU_Int32(2147483648d)
        DecimalToU_Int32(-0.999d)
        DecimalToU_Int32(-1d)
        DecimalToU_Int32(-2147483648.999d)
        DecimalToU_Int32(-2147483649d)
    End Sub
End Module
' The example displays the following output to the console:
'     Decimal Argument  Integer/Exception UInteger/Exception
'     ----------------      -------------     --------------
'                  123                123                123
'              123.000                123                123
'              123.999                124                124
'       4294967295.999  OverflowException  OverflowException
'           4294967296  OverflowException  OverflowException
'       2147483647.999  OverflowException         2147483648
'           2147483648  OverflowException         2147483648
'               -0.999                 -1  OverflowException
'                   -1                 -1  OverflowException
'      -2147483648.999  OverflowException  OverflowException
'          -2147483649  OverflowException  OverflowException

注解

此运算符支持显式转换为 Decimal a UInt32. 此类显式转换的语法依赖于语言，各个语言编译器可以提供不同的实现并返回不同的结果。该示例演示了在使用 C# 和 Visual Basic 将 Decimal 值显式转换为 UInt32 值时的不同返回值。若要执行独立于语言的转换，可以调用 Decimal.ToUInt32(Decimal) 或 Convert.ToUInt32(Decimal) 方法。

另请参阅

UInt32

适用于

Explicit(Decimal to UInt16)

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

重要

此 API 不符合 CLS。

定义到 16 位无符号整数的 Decimal 显式转换。

此 API 不符合 CLS。

public:
 static explicit operator System::UInt16(System::Decimal value);

[System.CLSCompliant(false)]
public static explicit operator ushort(decimal value);

[<System.CLSCompliant(false)>]
static member op_Explicit : decimal -> uint16

Public Shared Narrowing Operator CType (value As Decimal) As UShort

参数

value: Decimal

要转换的值。

UInt16

一个表示已 Decimal转换的 16 位无符号整数。

属性: CLSCompliantAttribute

例外

OverflowException

value 小于 UInt16.MinValue 或大于 UInt16.MaxValue。

示例

以下示例使用显式Decimal到UInt16转换运算符将数字转换为Decimal UInt16值。

// Example of the explicit conversions from decimal to short and
// decimal to ushort.
using System;

class DecimalToU_Int16Demo
{
    const string formatter = "{0,16}{1,19}{2,19}";

    // Get the exception type name; remove the namespace prefix.
    public static string GetExceptionType( Exception ex )
    {
        string exceptionType = ex.GetType( ).ToString( );
        return exceptionType.Substring(
            exceptionType.LastIndexOf( '.' ) + 1 );
    }

    // Convert the decimal argument; catch exceptions that are thrown.
    public static void DecimalToU_Int16( decimal argument )
    {
        object Int16Value;
        object UInt16Value;

        // Convert the argument to a short value.
        try
        {
            Int16Value = (short)argument;
        }
        catch( Exception ex )
        {
            Int16Value = GetExceptionType( ex );
        }

        // Convert the argument to a ushort value.
        try
        {
            UInt16Value = (ushort)argument;
        }
        catch( Exception ex )
        {
            UInt16Value = GetExceptionType( ex );
        }

        Console.WriteLine( formatter, argument,
            Int16Value, UInt16Value );
    }

    public static void Main( )
    {
        Console.WriteLine(
            "This example of the explicit conversions from decimal " +
            "to short \nand decimal to ushort generates the " +
            "following output. It displays \nseveral converted " +
            "decimal values.\n" );
        Console.WriteLine( formatter, "decimal argument",
            "short/exception", "ushort/exception" );
        Console.WriteLine( formatter, "----------------",
            "---------------", "----------------" );

        // Convert decimal values and display the results.
        DecimalToU_Int16( 123M );
        DecimalToU_Int16( new decimal( 123000, 0, 0, false, 3 ) );
        DecimalToU_Int16( 123.999M );
        DecimalToU_Int16( 65535.999M );
        DecimalToU_Int16( 65536M );
        DecimalToU_Int16( 32767.999M );
        DecimalToU_Int16( 32768M );
        DecimalToU_Int16( - 0.999M );
        DecimalToU_Int16( - 1M );
        DecimalToU_Int16( - 32768.999M );
        DecimalToU_Int16( - 32769M );
    }
}

/*
This example of the explicit conversions from decimal to short
and decimal to ushort generates the following output. It displays
several converted decimal values.

decimal argument    short/exception   ushort/exception
----------------    ---------------   ----------------
             123                123                123
         123.000                123                123
         123.999                123                123
       65535.999  OverflowException              65535
           65536  OverflowException  OverflowException
       32767.999              32767              32767
           32768  OverflowException              32768
          -0.999                  0                  0
              -1                 -1  OverflowException
      -32768.999             -32768  OverflowException
          -32769  OverflowException  OverflowException
*/

// Example of the explicit conversions from decimal to short and
// decimal to ushort.
let print obj1 obj2 obj3 =
    printfn $"{obj1, 16}{obj2, 19}{obj3, 19}"

// Get the exception type name; remove the namespace prefix.
let getExceptionType (ex: exn) =
    let exceptionType = ex.GetType() |> string
    exceptionType.Substring(exceptionType.LastIndexOf '.' + 1)

// Convert the decimal argument; catch exceptions that are thrown.
let decimalToU_Int16 (argument: decimal) =
    let int16Value: obj =
        // Convert the argument to a int16 value.
        try
            int16 argument
        with ex -> getExceptionType ex

    let uint16Value: obj =
        // Convert the argument to a uint16 value.
        try
            uint16 argument
        with ex -> getExceptionType ex

    print argument int16Value uint16Value

printfn "This example of the explicit conversions from decimal to short\nand decimal to ushort generates the following output. It displays \nseveral converted decimal values.\n"
print "decimal argument" "short/exception" "ushort/exception"
print "----------------" "---------------" "----------------"

// Convert decimal values and display the results.
decimalToU_Int16 123M
decimalToU_Int16 (new decimal (123000, 0, 0, false, 3uy))
decimalToU_Int16 123.999M
decimalToU_Int16 65535.999M
decimalToU_Int16 65536M
decimalToU_Int16 32767.999M
decimalToU_Int16 32768M
decimalToU_Int16 -0.999M
decimalToU_Int16 -1M
decimalToU_Int16 -32768.999M
decimalToU_Int16 -32769M


// This example of the explicit conversions from decimal to short
// and decimal to ushort generates the following output. It displays
// several converted decimal values.
//
// decimal argument    short/exception   ushort/exception
// ----------------    ---------------   ----------------
//              123                123                123
//          123.000                123                123
//          123.999                123                123
//        65535.999  OverflowException              65535
//            65536  OverflowException  OverflowException
//        32767.999              32767              32767
//            32768  OverflowException              32768
//           -0.999                  0                  0
//               -1                 -1  OverflowException
//       -32768.999             -32768  OverflowException
//           -32769  OverflowException  OverflowException

' Example of the explicit conversions from Decimal to Short and 
' Decimal to UShort.
Module DecimalToU_Int16Demo

    Const formatter As String = "{0,16}{1,19}{2,19}"

    ' Convert the decimal argument and catch exceptions that are thrown.
    Public Sub DecimalToU_Int16(argument As Decimal)
        Dim Int16Value As Object
        Dim UInt16Value As Object

        ' Convert the argument to a Short value.
        Try
            Int16Value = CShort(argument)
        Catch ex As Exception 
            Int16Value = ex.GetType().Name
        End Try

        ' Convert the argument to a UShort value.
        Try
            UInt16Value = CUShort(argument)
        Catch ex As Exception
            UInt16Value = ex.GetType().Name
        End Try

        Console.WriteLine( formatter, argument, _
            Int16Value, UInt16Value )
    End Sub

    Public Sub Main( )
        Console.WriteLine( formatter, "Decimal argument", _ 
            "Short/Exception", "UShort/Exception" )
        Console.WriteLine( formatter, "----------------", _ 
            "---------------", "----------------" )

        ' Convert decimal values and display the results.
        DecimalToU_Int16(123d)
        DecimalToU_Int16(New Decimal( 123000, 0, 0, False, 3 ))
        DecimalToU_Int16(123.999d)
        DecimalToU_Int16(65535.999d)
        DecimalToU_Int16(65536d)
        DecimalToU_Int16(32767.999d)
        DecimalToU_Int16(32768d)
        DecimalToU_Int16(-0.999d)
        DecimalToU_Int16(-1d)
        DecimalToU_Int16(-32768.999d)
        DecimalToU_Int16(-32769d)
    End Sub
End Module
' This example displays the following output to the console:
'    Decimal argument    Short/Exception   UShort/Exception
'    ----------------    ---------------   ----------------
'                 123                123                123
'             123.000                123                123
'             123.999                124                124
'           65535.999  OverflowException  OverflowException
'               65536  OverflowException  OverflowException
'           32767.999  OverflowException              32768
'               32768  OverflowException              32768
'              -0.999                 -1  OverflowException
'                  -1                 -1  OverflowException
'          -32768.999  OverflowException  OverflowException
'              -32769  OverflowException  OverflowException

注解

此运算符支持显式转换为 Decimal a UInt16. 此类显式转换的语法依赖于语言，各个语言编译器可以提供不同的实现并返回不同的结果。该示例演示了在使用 C# 和 Visual Basic 将 Decimal 值显式转换为 UInt16 值时的不同返回值。若要执行独立于语言的转换，可以调用 Decimal.ToUInt16(Decimal) 或 Convert.ToUInt16(Decimal) 方法。

另请参阅

UInt16

适用于

Explicit(Decimal to SByte)

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

重要

此 API 不符合 CLS。

符合 CLS 的替代方案: System.Decimal.ToInt16(Decimal)

定义到 8 位有符号整数的 Decimal 显式转换。

此 API 不符合 CLS。

public:
 static explicit operator System::SByte(System::Decimal value);

[System.CLSCompliant(false)]
public static explicit operator sbyte(decimal value);

[<System.CLSCompliant(false)>]
static member op_Explicit : decimal -> sbyte

Public Shared Narrowing Operator CType (value As Decimal) As SByte

参数

value: Decimal

要转换的值。

SByte

一个表示已 Decimal转换的 8 位有符号整数。

属性: CLSCompliantAttribute

例外

OverflowException

value 小于 SByte.MinValue 或大于 SByte.MaxValue。

示例

以下示例使用显式Decimal到SByte转换运算符将数字转换为Decimal SByte值。

using System;

class Example
{
    public static void Main()
    {
        // Define an array of decimal values.
       decimal[] values = { 78m, new Decimal(78000, 0, 0, false, 3),
                            78.999m, 255.999m, 256m, 127.999m,
                            128m, -0.999m, -1m, -128.999m, -129m };
       foreach (var value in values) {
          try {
              SByte byteValue = (SByte) value;
              Console.WriteLine("{0} ({1}) --> {2} ({3})", value,
                                value.GetType().Name, byteValue,
                                byteValue.GetType().Name);
           }
           catch (OverflowException) {
              Console.WriteLine("OverflowException: Cannot convert {0}",
                                value);
           }
       }
    }
}
// The example displays the following output:
//       78 (Decimal) --> 78 (SByte)
//       78.000 (Decimal) --> 78 (SByte)
//       78.999 (Decimal) --> 78 (SByte)
//       OverflowException: Cannot convert 255.999
//       OverflowException: Cannot convert 256
//       127.999 (Decimal) --> 127 (SByte)
//       OverflowException: Cannot convert 128
//       -0.999 (Decimal) --> 0 (SByte)
//       -1 (Decimal) --> -1 (SByte)
//       -128.999 (Decimal) --> -128 (SByte)
//       OverflowException: Cannot convert -129

open System

// Define a list of decimal values.
let values = 
    [ 78m; Decimal(78000, 0, 0, false, 3uy)
      78.999m; 255.999m; 256m; 127.999m
      128m; -0.999m; -1m; -128.999m; -129m ]
for value in values do
    try
        let byteValue = int8 value
        printfn $"{value} ({value.GetType().Name}) --> {byteValue} ({byteValue.GetType().Name})"
    with :? OverflowException ->
        printfn $"OverflowException: Cannot convert {value}"

// The example displays the following output:
//       78 (Decimal) --> 78 (SByte)
//       78.000 (Decimal) --> 78 (SByte)
//       78.999 (Decimal) --> 78 (SByte)
//       OverflowException: Cannot convert 255.999
//       OverflowException: Cannot convert 256
//       127.999 (Decimal) --> 127 (SByte)
//       OverflowException: Cannot convert 128
//       -0.999 (Decimal) --> 0 (SByte)
//       -1 (Decimal) --> -1 (SByte)
//       -128.999 (Decimal) --> -128 (SByte)
//       OverflowException: Cannot convert -129

Option Strict On

Module Example
    Public Sub Main()
        ' Define an array of decimal values.
        Dim values() As Decimal = { 78d, New Decimal(78000, 0, 0, False, 3),
                                    78.999d, 255.999d, 256d, 127.999d,
                                    128d, -0.999d, -1d, -128.999d, 
                                    -129d }           
        For Each value In values
           Try
              Dim byteValue As SByte = CSByte(value)
              Console.WriteLine("{0} ({1}) --> {2} ({3})", value,
                                value.GetType().Name, byteValue, 
                                byteValue.GetType().Name)
           Catch e As OverflowException
              Console.WriteLine("OverflowException: Cannot convert {0}",
                                value)
           End Try
        Next   
    End Sub
End Module
' The example displays the following output:
'       78 (Decimal) --> 78 (SByte)
'       78.000 (Decimal) --> 78 (SByte)
'       78.999 (Decimal) --> 79 (SByte)
'       OverflowException: Cannot convert 255.999
'       OverflowException: Cannot convert 256
'       OverflowException: Cannot convert 127.999
'       OverflowException: Cannot convert 128
'       -0.999 (Decimal) --> -1 (SByte)
'       -1 (Decimal) --> -1 (SByte)
'       OverflowException: Cannot convert -128.999
'       OverflowException: Cannot convert -129

注解

此运算符支持显式转换为 Decimal a SByte. 此类显式转换的语法依赖于语言，各个语言编译器可以提供不同的实现并返回不同的结果。该示例演示了在使用 C# 和 Visual Basic 将 Decimal 值显式转换为 Byte 和 SByte 值时的不同返回值。若要执行独立于语言的转换，可以调用 Decimal.ToSByte(Decimal) 该方法或 Convert.ToSByte(Decimal) 方法。

另请参阅

SByte

适用于

Explicit(Decimal to Single)

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

定义到单精度浮点数的 Decimal 显式转换。

public:
 static explicit operator float(System::Decimal value);

public static explicit operator float(decimal value);

static member op_Explicit : decimal -> single

Public Shared Narrowing Operator CType (value As Decimal) As Single

参数

value: Decimal

要转换的值。

Single

一个表示转换 Decimal后的单精度浮点数。

示例

以下示例使用显式Decimal到Single转换运算符将数字转换为Decimal Single值。

using System;

class Example
{
    public static void Main( )
    {
        // Define an array of decimal values.
        decimal[] values = { 0.0000000000000000000000000001M,
                             0.0000000000123456789123456789M,
                             123M, new decimal(123000000, 0, 0, false, 6),
                             123456789.123456789M,
                             123456789123456789123456789M,
                             decimal.MinValue, decimal.MaxValue };
        // Convert each value to a double.
        foreach (var value in values) {
            float dblValue = (float) value;
            Console.WriteLine("{0} ({1}) --> {2} ({3})", value,
                              value.GetType().Name, dblValue,
                              dblValue.GetType().Name);
       }
    }
}
// The example displays the following output:
//    0.0000000000000000000000000001 (Decimal) --> 1E-28 (Single)
//    0.0000000000123456789123456789 (Decimal) --> 1.234568E-11 (Single)
//    123 (Decimal) --> 123 (Single)
//    123.000000 (Decimal) --> 123 (Single)
//    123456789.123456789 (Decimal) --> 1.234568E+08 (Single)
//    123456789123456789123456789 (Decimal) --> 1.234568E+26 (Single)
//    -79228162514264337593543950335 (Decimal) --> -7.922816E+28 (Single)
//    79228162514264337593543950335 (Decimal) --> 7.922816E+28 (Single)

open System

// Define a list of decimal values.
let values = 
    [ 0.0000000000000000000000000001M
      0.0000000000123456789123456789M
      123M; Decimal(123000000, 0, 0, false, 6uy)
      123456789.123456789M
      123456789123456789123456789M
      Decimal.MinValue; Decimal.MaxValue ]

// Convert each value to a double.
for value in values do
    let dblValue = float32 value
    printfn $"{value} ({value.GetType().Name}) --> {dblValue} ({dblValue.GetType().Name})"

// The example displays the following output:
//    0.0000000000000000000000000001 (Decimal) --> 1E-28 (Single)
//    0.0000000000123456789123456789 (Decimal) --> 1.234568E-11 (Single)
//    123 (Decimal) --> 123 (Single)
//    123.000000 (Decimal) --> 123 (Single)
//    123456789.123456789 (Decimal) --> 1.234568E+08 (Single)
//    123456789123456789123456789 (Decimal) --> 1.234568E+26 (Single)
//    -79228162514264337593543950335 (Decimal) --> -7.922816E+28 (Single)
//    79228162514264337593543950335 (Decimal) --> 7.922816E+28 (Single)

Module Example
    Public Sub Main( )
        ' Define an array of Decimal values.
        Dim values() As Decimal= { 0.0000000000000000000000000001d, 
                                   0.0000000000123456789123456789d,
                                   123d, 
                                   New Decimal(123000000, 0, 0, False, 6),
                                   123456789.123456789d, 
                                   123456789123456789123456789d, 
                                   Decimal.MinValue, Decimal.MaxValue }
        For Each value In values
            Dim dblValue As Single = CSng(value)
            Console.WriteLine("{0} ({1}) --> {2} ({3})", value,
                              value.GetType().Name, dblValue, 
                              dblValue.GetType().Name)
        Next
    End Sub
End Module
' The example displays the following output:
'    0.0000000000000000000000000001 (Decimal) --> 1E-28 (Single)
'    0.0000000000123456789123456789 (Decimal) --> 1.234568E-11 (Single)
'    123 (Decimal) --> 123 (Single)
'    123.000000 (Decimal) --> 123 (Single)
'    123456789.123456789 (Decimal) --> 1.234568E+08 (Single)
'    123456789123456789123456789 (Decimal) --> 1.234568E+26 (Single)
'    -79228162514264337593543950335 (Decimal) --> -7.922816E+28 (Single)
'    79228162514264337593543950335 (Decimal) --> 7.922816E+28 (Single)

注解

此操作可能会导致精度损失，因为单精度浮点数的显著位数比 a Decimal少。

此运算符支持显式转换为 Decimal a Single. 此类显式转换的语法依赖于语言，各个语言编译器可以提供不同的实现并返回不同的结果。该示例演示了在使用 C# 和 Visual Basic 将 Decimal 值显式转换为 Single 值时的不同返回值。若要执行独立于语言的转换，可以调用 Decimal.ToSingle(Decimal) 或 Convert.ToSingle(Decimal) 方法。

另请参阅

Single

适用于

Explicit(Decimal to Int32)

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

定义到 32 位有符号整数的 Decimal 显式转换。

public:
 static explicit operator int(System::Decimal value);

public static explicit operator int(decimal value);

static member op_Explicit : decimal -> int

Public Shared Narrowing Operator CType (value As Decimal) As Integer

参数

value: Decimal

要转换的值。

Int32

一个表示已 Decimal转换的 32 位有符号整数。

例外

OverflowException

value 小于 Int32.MinValue 或大于 Int32.MaxValue。

示例

以下示例使用显式Decimal到Int32转换运算符将数字转换为Decimal Int32值。

// Example of the explicit conversions from decimal to int and
// decimal to uint.
using System;

class DecimalToU_Int32Demo
{
    const string formatter = "{0,17}{1,19}{2,19}";

    // Get the exception type name; remove the namespace prefix.
    public static string GetExceptionType( Exception ex )
    {
        string exceptionType = ex.GetType( ).ToString( );
        return exceptionType.Substring(
            exceptionType.LastIndexOf( '.' ) + 1 );
    }

    // Convert the decimal argument; catch exceptions that are thrown.
    public static void DecimalToU_Int32( decimal argument )
    {
        object Int32Value;
        object UInt32Value;

        // Convert the argument to an int value.
        try
        {
            Int32Value = (int)argument;
        }
        catch( Exception ex )
        {
            Int32Value = GetExceptionType( ex );
        }

        // Convert the argument to a uint value.
        try
        {
            UInt32Value = (uint)argument;
        }
        catch( Exception ex )
        {
            UInt32Value = GetExceptionType( ex );
        }

        Console.WriteLine( formatter, argument,
            Int32Value, UInt32Value );
    }

    public static void Main( )
    {
        Console.WriteLine(
            "This example of the explicit conversions from decimal " +
            "to int \nand decimal to uint generates the following " +
            "output. It displays \nseveral converted decimal " +
            "values.\n" );
        Console.WriteLine( formatter, "decimal argument",
            "int/exception", "uint/exception" );
        Console.WriteLine( formatter, "----------------",
            "-------------", "--------------" );

        // Convert decimal values and display the results.
        DecimalToU_Int32( 123M );
        DecimalToU_Int32( new decimal( 123000, 0, 0, false, 3 ) );
        DecimalToU_Int32( 123.999M );
        DecimalToU_Int32( 4294967295.999M );
        DecimalToU_Int32( 4294967296M );
        DecimalToU_Int32( 2147483647.999M );
        DecimalToU_Int32( 2147483648M );
        DecimalToU_Int32( - 0.999M );
        DecimalToU_Int32( - 1M );
        DecimalToU_Int32( - 2147483648.999M );
        DecimalToU_Int32( - 2147483649M );
    }
}

/*
This example of the explicit conversions from decimal to int
and decimal to uint generates the following output. It displays
several converted decimal values.

 decimal argument      int/exception     uint/exception
 ----------------      -------------     --------------
              123                123                123
          123.000                123                123
          123.999                123                123
   4294967295.999  OverflowException         4294967295
       4294967296  OverflowException  OverflowException
   2147483647.999         2147483647         2147483647
       2147483648  OverflowException         2147483648
           -0.999                  0                  0
               -1                 -1  OverflowException
  -2147483648.999        -2147483648  OverflowException
      -2147483649  OverflowException  OverflowException
*/

// Example of the explicit conversions from decimal to int and
// decimal to uint.
let print obj1 obj2 obj3 = printfn $"{obj1,17}{obj2,19}{obj3,19}"

// Get the exception type name; remove the namespace prefix.
let getExceptionType (ex: exn) =
    let exceptionType = ex.GetType() |> string
    exceptionType.Substring(exceptionType.LastIndexOf '.' + 1)

// Convert the decimal argument; catch exceptions that are thrown.
let decimalToU_Int32 (argument: decimal) =
    let int32Value: obj =
        // Convert the argument to a int32 value.
        try
            int32 argument
        with ex -> getExceptionType ex

    let uint32Value: obj =
        // Convert the argument to a uint32 value.
        try
            uint32 argument
        with ex -> getExceptionType ex

    print argument int32Value uint32Value

printfn "This example of the explicit conversions from decimal to int\nand decimal to uint generates the following output. It displays\nseveral converted decimal values.\n"

print "decimal argument" "int/exception" "uint/exception"
print "----------------" "-------------" "--------------" 

// Convert decimal values and display the results.
decimalToU_Int32 123M
decimalToU_Int32 (new decimal(123000, 0, 0, false, 3uy))
decimalToU_Int32 123.999M
decimalToU_Int32 4294967295.999M
decimalToU_Int32 4294967296M
decimalToU_Int32 2147483647.999M
decimalToU_Int32 2147483648M
decimalToU_Int32 -0.999M
decimalToU_Int32 -1M
decimalToU_Int32 -2147483648.999M
decimalToU_Int32 -2147483649M


// This example of the explicit conversions from decimal to int
// and decimal to uint generates the following output. It displays
// several converted decimal values.
//
//  decimal argument      int/exception     uint/exception
//  ----------------      -------------     --------------
//               123                123                123
//           123.000                123                123
//           123.999                123                123
//    4294967295.999  OverflowException         4294967295
//        4294967296  OverflowException  OverflowException
//    2147483647.999         2147483647         2147483647
//        2147483648  OverflowException         2147483648
//            -0.999                  0                  0
//                -1                 -1  OverflowException
//   -2147483648.999        -2147483648  OverflowException
//       -2147483649  OverflowException  OverflowException

' Example of the explicit conversions from Decimal to Integer and 
' Decimal to UInteger.
Module DecimalToU_Int32Demo

    Const formatter As String = "{0,17}{1,19}{2,19}"

    ' Convert the decimal argument catch exceptions that are thrown.
    Public Sub DecimalToU_Int32(argument As Decimal)
        Dim Int32Value As Object
        Dim UInt32Value As Object

        ' Convert the argument to an int value.
        Try
            Int32Value = CInt(argument)
        Catch ex As Exception 
            Int32Value = ex.GetType().Name
        End Try

        ' Convert the argument to a uint value.
        Try
            UInt32Value = CUInt(argument)
        Catch ex As Exception
            UInt32Value = ex.GetType().Name
        End Try

        Console.WriteLine(formatter, argument, _
            Int32Value, UInt32Value)
    End Sub

    Public Sub Main( )
        Console.WriteLine( formatter, "Decimal Argument", _ 
            "Integer/Exception", "UInteger/Exception" )
        Console.WriteLine( formatter, "----------------", _ 
            "-------------", "--------------" )

        ' Convert decimal values and display the results.
        DecimalToU_Int32( 123d)
        DecimalToU_Int32(New Decimal(123000, 0, 0, False, 3))
        DecimalToU_Int32(123.999d)
        DecimalToU_Int32(4294967295.999d)
        DecimalToU_Int32(4294967296d)
        DecimalToU_Int32(2147483647.999d)
        DecimalToU_Int32(2147483648d)
        DecimalToU_Int32(-0.999d)
        DecimalToU_Int32(-1d)
        DecimalToU_Int32(-2147483648.999d)
        DecimalToU_Int32(-2147483649d)
    End Sub
End Module
' The example displays the following output to the console:
'     Decimal Argument  Integer/Exception UInteger/Exception
'     ----------------      -------------     --------------
'                  123                123                123
'              123.000                123                123
'              123.999                124                124
'       4294967295.999  OverflowException  OverflowException
'           4294967296  OverflowException  OverflowException
'       2147483647.999  OverflowException         2147483648
'           2147483648  OverflowException         2147483648
'               -0.999                 -1  OverflowException
'                   -1                 -1  OverflowException
'      -2147483648.999  OverflowException  OverflowException
'          -2147483649  OverflowException  OverflowException

注解

此运算符支持将 a Decimal 显式转换为 .Int32 此类显式转换的语法依赖于语言，各个语言编译器可以提供不同的实现并返回不同的结果。该示例演示了将值Decimal显式转换为Int32值时的不同返回值。若要执行独立于语言的转换，可以调用 Decimal.ToInt32(Decimal) 或 Convert.ToInt32(Decimal) 方法。

另请参阅

Int32

适用于

Explicit(Decimal to Int16)

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

定义到 16 位有符号整数的 Decimal 显式转换。

public:
 static explicit operator short(System::Decimal value);

public static explicit operator short(decimal value);

static member op_Explicit : decimal -> int16

Public Shared Narrowing Operator CType (value As Decimal) As Short

参数

value: Decimal

要转换的值。

Int16

一个表示已 Decimal转换的 16 位带符号整数。

例外

OverflowException

value 小于 Int16.MinValue 或大于 Int16.MaxValue。

示例

以下示例使用显式Decimal到Int16转换运算符将数字转换为Decimal Int16值。

// Example of the explicit conversions from decimal to short and
// decimal to ushort.
using System;

class DecimalToU_Int16Demo
{
    const string formatter = "{0,16}{1,19}{2,19}";

    // Get the exception type name; remove the namespace prefix.
    public static string GetExceptionType( Exception ex )
    {
        string exceptionType = ex.GetType( ).ToString( );
        return exceptionType.Substring(
            exceptionType.LastIndexOf( '.' ) + 1 );
    }

    // Convert the decimal argument; catch exceptions that are thrown.
    public static void DecimalToU_Int16( decimal argument )
    {
        object Int16Value;
        object UInt16Value;

        // Convert the argument to a short value.
        try
        {
            Int16Value = (short)argument;
        }
        catch( Exception ex )
        {
            Int16Value = GetExceptionType( ex );
        }

        // Convert the argument to a ushort value.
        try
        {
            UInt16Value = (ushort)argument;
        }
        catch( Exception ex )
        {
            UInt16Value = GetExceptionType( ex );
        }

        Console.WriteLine( formatter, argument,
            Int16Value, UInt16Value );
    }

    public static void Main( )
    {
        Console.WriteLine(
            "This example of the explicit conversions from decimal " +
            "to short \nand decimal to ushort generates the " +
            "following output. It displays \nseveral converted " +
            "decimal values.\n" );
        Console.WriteLine( formatter, "decimal argument",
            "short/exception", "ushort/exception" );
        Console.WriteLine( formatter, "----------------",
            "---------------", "----------------" );

        // Convert decimal values and display the results.
        DecimalToU_Int16( 123M );
        DecimalToU_Int16( new decimal( 123000, 0, 0, false, 3 ) );
        DecimalToU_Int16( 123.999M );
        DecimalToU_Int16( 65535.999M );
        DecimalToU_Int16( 65536M );
        DecimalToU_Int16( 32767.999M );
        DecimalToU_Int16( 32768M );
        DecimalToU_Int16( - 0.999M );
        DecimalToU_Int16( - 1M );
        DecimalToU_Int16( - 32768.999M );
        DecimalToU_Int16( - 32769M );
    }
}

/*
This example of the explicit conversions from decimal to short
and decimal to ushort generates the following output. It displays
several converted decimal values.

decimal argument    short/exception   ushort/exception
----------------    ---------------   ----------------
             123                123                123
         123.000                123                123
         123.999                123                123
       65535.999  OverflowException              65535
           65536  OverflowException  OverflowException
       32767.999              32767              32767
           32768  OverflowException              32768
          -0.999                  0                  0
              -1                 -1  OverflowException
      -32768.999             -32768  OverflowException
          -32769  OverflowException  OverflowException
*/

// Example of the explicit conversions from decimal to short and
// decimal to ushort.
let print obj1 obj2 obj3 =
    printfn $"{obj1, 16}{obj2, 19}{obj3, 19}"

// Get the exception type name; remove the namespace prefix.
let getExceptionType (ex: exn) =
    let exceptionType = ex.GetType() |> string
    exceptionType.Substring(exceptionType.LastIndexOf '.' + 1)

// Convert the decimal argument; catch exceptions that are thrown.
let decimalToU_Int16 (argument: decimal) =
    let int16Value: obj =
        // Convert the argument to a int16 value.
        try
            int16 argument
        with ex -> getExceptionType ex

    let uint16Value: obj =
        // Convert the argument to a uint16 value.
        try
            uint16 argument
        with ex -> getExceptionType ex

    print argument int16Value uint16Value

printfn "This example of the explicit conversions from decimal to short\nand decimal to ushort generates the following output. It displays \nseveral converted decimal values.\n"
print "decimal argument" "short/exception" "ushort/exception"
print "----------------" "---------------" "----------------"

// Convert decimal values and display the results.
decimalToU_Int16 123M
decimalToU_Int16 (new decimal (123000, 0, 0, false, 3uy))
decimalToU_Int16 123.999M
decimalToU_Int16 65535.999M
decimalToU_Int16 65536M
decimalToU_Int16 32767.999M
decimalToU_Int16 32768M
decimalToU_Int16 -0.999M
decimalToU_Int16 -1M
decimalToU_Int16 -32768.999M
decimalToU_Int16 -32769M


// This example of the explicit conversions from decimal to short
// and decimal to ushort generates the following output. It displays
// several converted decimal values.
//
// decimal argument    short/exception   ushort/exception
// ----------------    ---------------   ----------------
//              123                123                123
//          123.000                123                123
//          123.999                123                123
//        65535.999  OverflowException              65535
//            65536  OverflowException  OverflowException
//        32767.999              32767              32767
//            32768  OverflowException              32768
//           -0.999                  0                  0
//               -1                 -1  OverflowException
//       -32768.999             -32768  OverflowException
//           -32769  OverflowException  OverflowException

' Example of the explicit conversions from Decimal to Short and 
' Decimal to UShort.
Module DecimalToU_Int16Demo

    Const formatter As String = "{0,16}{1,19}{2,19}"

    ' Convert the decimal argument and catch exceptions that are thrown.
    Public Sub DecimalToU_Int16(argument As Decimal)
        Dim Int16Value As Object
        Dim UInt16Value As Object

        ' Convert the argument to a Short value.
        Try
            Int16Value = CShort(argument)
        Catch ex As Exception 
            Int16Value = ex.GetType().Name
        End Try

        ' Convert the argument to a UShort value.
        Try
            UInt16Value = CUShort(argument)
        Catch ex As Exception
            UInt16Value = ex.GetType().Name
        End Try

        Console.WriteLine( formatter, argument, _
            Int16Value, UInt16Value )
    End Sub

    Public Sub Main( )
        Console.WriteLine( formatter, "Decimal argument", _ 
            "Short/Exception", "UShort/Exception" )
        Console.WriteLine( formatter, "----------------", _ 
            "---------------", "----------------" )

        ' Convert decimal values and display the results.
        DecimalToU_Int16(123d)
        DecimalToU_Int16(New Decimal( 123000, 0, 0, False, 3 ))
        DecimalToU_Int16(123.999d)
        DecimalToU_Int16(65535.999d)
        DecimalToU_Int16(65536d)
        DecimalToU_Int16(32767.999d)
        DecimalToU_Int16(32768d)
        DecimalToU_Int16(-0.999d)
        DecimalToU_Int16(-1d)
        DecimalToU_Int16(-32768.999d)
        DecimalToU_Int16(-32769d)
    End Sub
End Module
' This example displays the following output to the console:
'    Decimal argument    Short/Exception   UShort/Exception
'    ----------------    ---------------   ----------------
'                 123                123                123
'             123.000                123                123
'             123.999                124                124
'           65535.999  OverflowException  OverflowException
'               65536  OverflowException  OverflowException
'           32767.999  OverflowException              32768
'               32768  OverflowException              32768
'              -0.999                 -1  OverflowException
'                  -1                 -1  OverflowException
'          -32768.999  OverflowException  OverflowException
'              -32769  OverflowException  OverflowException

注解

此运算符支持将 a Decimal 显式转换为 .Int16 此类显式转换的语法依赖于语言，各个语言编译器可以提供不同的实现并返回不同的结果。该示例演示了将值Decimal显式转换为Int16值时的不同返回值。若要执行独立于语言的转换，可以调用 Decimal.ToInt16(Decimal) 或 Convert.ToInt16(Decimal) 方法。

另请参阅

Int16

适用于

Explicit(Decimal to Double)

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

定义对双精度浮点数的 Decimal 显式转换。

public:
 static explicit operator double(System::Decimal value);

public static explicit operator double(decimal value);

static member op_Explicit : decimal -> double

Public Shared Narrowing Operator CType (value As Decimal) As Double

参数

value: Decimal

要转换的值。

Double

表示已 Decimal转换的双精度浮点数。

示例

以下示例使用显式Decimal到Double转换运算符将数字转换为Decimal Double值。

using System;

class Example
{
    public static void Main( )
    {
        // Define an array of decimal values.
        decimal[] values = { 0.0000000000000000000000000001M,
                             0.0000000000123456789123456789M,
                             123M, new decimal(123000000, 0, 0, false, 6),
                             123456789.123456789M,
                             123456789123456789123456789M,
                             decimal.MinValue, decimal.MaxValue };
        // Convert each value to a double.
        foreach (var value in values) {
            double dblValue = (double) value;
            Console.WriteLine("{0} ({1}) --> {2} ({3})", value,
                              value.GetType().Name, dblValue,
                              dblValue.GetType().Name);
       }
    }
}
// The example displays the following output:
//    0.0000000000000000000000000001 (Decimal) --> 1E-28 (Double)
//    0.0000000000123456789123456789 (Decimal) --> 1.23456789123457E-11 (Double)
//    123 (Decimal) --> 123 (Double)
//    123.000000 (Decimal) --> 123 (Double)
//    123456789.123456789 (Decimal) --> 123456789.123457 (Double)
//    123456789123456789123456789 (Decimal) --> 1.23456789123457E+26 (Double)
//    -79228162514264337593543950335 (Decimal) --> -7.92281625142643E+28 (Double)
//    79228162514264337593543950335 (Decimal) --> 7.92281625142643E+28 (Double)

open System

// Define a list of decimal values.
let values = 
    [ 0.0000000000000000000000000001M
      0.0000000000123456789123456789M
      123M; Decimal(123000000, 0, 0, false, 6uy)
      123456789.123456789M
      123456789123456789123456789M
      Decimal.MinValue; Decimal.MaxValue ]

// Convert each value to a double.
for value in values do
    let dblValue = double value
    printfn $"{value} ({value.GetType().Name}) --> {dblValue} ({dblValue.GetType().Name})"

// The example displays the following output:
//    0.0000000000000000000000000001 (Decimal) --> 1E-28 (Double)
//    0.0000000000123456789123456789 (Decimal) --> 1.23456789123457E-11 (Double)
//    123 (Decimal) --> 123 (Double)
//    123.000000 (Decimal) --> 123 (Double)
//    123456789.123456789 (Decimal) --> 123456789.123457 (Double)
//    123456789123456789123456789 (Decimal) --> 1.23456789123457E+26 (Double)
//    -79228162514264337593543950335 (Decimal) --> -7.92281625142643E+28 (Double)
//    79228162514264337593543950335 (Decimal) --> 7.92281625142643E+28 (Double)

Module Example
    Public Sub Main( )
        ' Define an array of Decimal values.
        Dim values() As Decimal= { 0.0000000000000000000000000001d, 
                                   0.0000000000123456789123456789d,
                                   123d, 
                                   New Decimal(123000000, 0, 0, False, 6),
                                   123456789.123456789d, 
                                   123456789123456789123456789d, 
                                   Decimal.MinValue, Decimal.MaxValue }
        For Each value In values
            Dim dblValue As Double = CDbl(value)
            Console.WriteLine("{0} ({1}) --> {2} ({3})", value,
                              value.GetType().Name, dblValue, 
                              dblValue.GetType().Name)
        Next
    End Sub
End Module
' The example displays the following output:
'    0.0000000000000000000000000001 (Decimal) --> 1E-28 (Double)
'    0.0000000000123456789123456789 (Decimal) --> 1.23456789123457E-11 (Double)
'    123 (Decimal) --> 123 (Double)
'    123.000000 (Decimal) --> 123 (Double)
'    123456789.123456789 (Decimal) --> 123456789.123457 (Double)
'    123456789123456789123456789 (Decimal) --> 1.23456789123457E+26 (Double)
'    -79228162514264337593543950335 (Decimal) --> -7.92281625142643E+28 (Double)
'    79228162514264337593543950335 (Decimal) --> 7.92281625142643E+28 (Double)

注解

此操作可能会导致精度损失，因为双精度浮点数的显著位数比 a Decimal少。

此运算符支持显式转换为 Decimal a Double. 此类显式转换的语法依赖于语言，各个语言编译器可以提供不同的实现并返回不同的结果。该示例演示了将值Decimal显式转换为Double值时的不同返回值。若要执行独立于语言的转换，可以调用 Decimal.ToDouble(Decimal) 或 Convert.ToDouble(Decimal) 方法。

另请参阅

Double

适用于

Explicit(Decimal to Char)

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

定义对 Unicode 字符的 Decimal 显式转换。

public:
 static explicit operator char(System::Decimal value);

public static explicit operator char(decimal value);

static member op_Explicit : decimal -> char

Public Shared Narrowing Operator CType (value As Decimal) As Char

参数

value: Decimal

要转换的值。

Char

表示已 Decimal转换的 Unicode 字符。

例外

OverflowException

value 小于 Char.MinValue 或大于 Char.MaxValue。

示例

以下示例使用显式Decimal转换Char运算符将数字转换为Decimal Char值（Unicode 字符）。

using System;

class Example
{
   public static void Main( )
   {
      // Define an array of decimal values.
      decimal[] values = { 3.33m, 55.5m, 77.7m, 123m, 123.999m, 170m,
                           188.88m, 222m, 244m, 8217m, 8250m, 65536m,
                           -1m };
      // Convert each value to a Char.
      foreach (decimal value in values) {
         try {
            char charValue = (char) value;
            Console.WriteLine("{0} --> {1} ({2:X4})", value,
                              charValue, (ushort) charValue);
         }
         catch (OverflowException) {
            Console.WriteLine("OverflowException: Cannot convert {0}",
                              value);
         }
      }
   }
}
// The example displays the following output:
//       3.33 --> ? (0003)
//       55.5 --> 7 (0037)
//       77.7 --> M (004D)
//       123 --> { (007B)
//       123.999 --> { (007B)
//       170 --> ª (00AA)
//       188.88 --> ¼ (00BC)
//       222 --> _ (00DE)
//       244 --> ô (00F4)
//       8217 --> ' (2019)
//       8250 --> > (203A)
//       OverflowException: Cannot convert 65536
//       OverflowException: Cannot convert -1

open System

// Define a list of decimal values.
let values = 
    [ 3.33m; 55.5m; 77.7m; 123m; 123.999m; 170m; 188.88m; 222m; 244m; 8217m; 8250m; 65536m; -1m ]

// Convert each value to a Char.
for value in values do
    try
        let charValue = char value
        printfn $"{value} --> {charValue} ({uint16 charValue:X4})"

    with :? OverflowException ->
        printfn $"OverflowException: Cannot convert {value}"

// The example displays the following output:
//       3.33 --> ? (0003)
//       55.5 --> 7 (0037)
//       77.7 --> M (004D)
//       123 --> { (007B)
//       123.999 --> { (007B)
//       170 --> ª (00AA)
//       188.88 --> ¼ (00BC)
//       222 --> _ (00DE)
//       244 --> ô (00F4)
//       8217 --> ' (2019)
//       8250 --> > (203A)
//       OverflowException: Cannot convert 65536
//       OverflowException: Cannot convert -1

' Visual Basic does not support explicit Decimal-to-Char
' conversion using either CType or CChar.

注解

此运算符支持显式转换为 Decimal a Char. 此类显式转换的语法依赖于语言，各个语言编译器可以提供不同的实现并返回不同的结果，或者根本不支持转换。例如，Visual Basic和 C++ 编译器不支持对 Decimal 转换的显式Char。

另请参阅

Char

适用于

Explicit(Decimal to Byte)

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

定义到 8 位无符号整数的 Decimal 显式转换。

public:
 static explicit operator System::Byte(System::Decimal value);

public static explicit operator byte(decimal value);

static member op_Explicit : decimal -> byte

Public Shared Narrowing Operator CType (value As Decimal) As Byte

参数

value: Decimal

要转换的值。

Byte

一个表示已 Decimal转换的 8 位无符号整数。

例外

OverflowException

value 小于 Byte.MinValue 或大于 Byte.MaxValue。

示例

以下示例使用显式Decimal到Byte转换运算符将数字转换为Decimal Byte值。

using System;

class Example
{
    public static void Main()
    {
        // Define an array of decimal values.
       decimal[] values = { 78m, new Decimal(78000, 0, 0, false, 3),
                            78.999m, 255.999m, 256m, 127.999m,
                            128m, -0.999m, -1m, -128.999m, -129m };
       foreach (var value in values) {
          try {
              Byte byteValue = (Byte) value;
              Console.WriteLine("{0} ({1}) --> {2} ({3})", value,
                                value.GetType().Name, byteValue,
                                byteValue.GetType().Name);
           }
           catch (OverflowException) {
              Console.WriteLine("OverflowException: Cannot convert {0}",
                                value);
           }
       }
    }
}
// The example displays the following output:
//       78 (Decimal) --> 78 (Byte)
//       78.000 (Decimal) --> 78 (Byte)
//       78.999 (Decimal) --> 78 (Byte)
//       255.999 (Decimal) --> 255 (Byte)
//       OverflowException: Cannot convert 256
//       127.999 (Decimal) --> 127 (Byte)
//       128 (Decimal) --> 128 (Byte)
//       -0.999 (Decimal) --> 0 (Byte)
//       OverflowException: Cannot convert -1
//       OverflowException: Cannot convert -128.999
//       OverflowException: Cannot convert -129

open System

// Define a list of decimal values.
let values = 
    [ 78m; Decimal(78000, 0, 0, false, 3uy)
      78.999m; 255.999m; 256m; 127.999m
      128m; -0.999m; -1m; -128.999m; -129m ]

for value in values do
    try
        let byteValue = byte value
        printfn $"{value} ({value.GetType().Name}) --> {byteValue} ({byteValue.GetType().Name})"

    with :? OverflowException ->
        printfn $"OverflowException: Cannot convert {value}"

// The example displays the following output:
//       78 (Decimal) --> 78 (Byte)
//       78.000 (Decimal) --> 78 (Byte)
//       78.999 (Decimal) --> 78 (Byte)
//       255.999 (Decimal) --> 255 (Byte)
//       OverflowException: Cannot convert 256
//       127.999 (Decimal) --> 127 (Byte)
//       128 (Decimal) --> 128 (Byte)
//       -0.999 (Decimal) --> 0 (Byte)
//       OverflowException: Cannot convert -1
//       OverflowException: Cannot convert -128.999
//       OverflowException: Cannot convert -129

Option Strict On

Module Example
    Public Sub Main()
        ' Define an array of decimal values.
        Dim values() As Decimal = { 78d, New Decimal(78000, 0, 0, False, 3),
                                    78.999d, 255.999d, 256d, 127.999d,
                                    128d, -0.999d, -1d, -128.999d, 
                                    -129d }           
        For Each value In values
           Try
              Dim byteValue As Byte = CByte(value)
              Console.WriteLine("{0} ({1}) --> {2} ({3})", value,
                                value.GetType().Name, byteValue, 
                                byteValue.GetType().Name)
           Catch e As OverflowException
              Console.WriteLine("OverflowException: Cannot convert {0}",
                                value)
           End Try
        Next   
    End Sub
End Module
' The example displays the following output:
'       78 (Decimal) --> 78 (Byte)
'       78.000 (Decimal) --> 78 (Byte)
'       78.999 (Decimal) --> 79 (Byte)
'       OverflowException: Cannot convert 255.999
'       OverflowException: Cannot convert 256
'       127.999 (Decimal) --> 128 (Byte)
'       128 (Decimal) --> 128 (Byte)
'       OverflowException: Cannot convert -0.999
'       OverflowException: Cannot convert -1
'       OverflowException: Cannot convert -128.999
'       OverflowException: Cannot convert -129

注解

此运算符支持显式转换为 Decimal a Byte. 此类显式转换的语法依赖于语言，各个语言编译器可以提供不同的实现并返回不同的结果。该示例演示了将值Decimal显式转换为Byte值时的不同返回值。若要执行独立于语言的转换，可以调用 Decimal.ToByte(Decimal) 或 Convert.ToByte(Decimal) 方法。

另请参阅

Byte

适用于

Explicit(Decimal to Int64)

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

Source:: Decimal.cs

定义到 64 位有符号整数的 Decimal 显式转换。

public:
 static explicit operator long(System::Decimal value);

public static explicit operator long(decimal value);

static member op_Explicit : decimal -> int64

Public Shared Narrowing Operator CType (value As Decimal) As Long

参数

value: Decimal

要转换的值。

Int64

一个表示已转换 Decimal的 64 位有符号整数。

例外

OverflowException

value 小于 Int64.MinValue 或大于 Int64.MaxValue。

示例

以下示例使用显式Decimal到Int64转换运算符将数字转换为Decimal Int64值。

// Example of the explicit conversions from decimal to long and
// decimal to ulong.
using System;

class DecimalToU_Int64Demo
{
    const string formatter = "{0,25}{1,22}{2,22}";

    // Get the exception type name; remove the namespace prefix.
    public static string GetExceptionType( Exception ex )
    {
        string exceptionType = ex.GetType( ).ToString( );
        return exceptionType.Substring(
            exceptionType.LastIndexOf( '.' ) + 1 );
    }

    // Convert the decimal argument; catch exceptions that are thrown.
    public static void DecimalToU_Int64( decimal argument )
    {
        object Int64Value;
        object UInt64Value;

        // Convert the argument to a long value.
        try
        {
            Int64Value = (long)argument;
        }
        catch( Exception ex )
        {
            Int64Value = GetExceptionType( ex );
        }

        // Convert the argument to a ulong value.
        try
        {
            UInt64Value = (ulong)argument;
        }
        catch( Exception ex )
        {
            UInt64Value = GetExceptionType( ex );
        }

        Console.WriteLine( formatter, argument,
            Int64Value, UInt64Value );
    }

    public static void Main( )
    {
        Console.WriteLine(
            "This example of the explicit conversions from decimal " +
            "to long \nand decimal to ulong generates the following " +
            "output. It displays \nseveral converted decimal " +
            "values.\n" );
        Console.WriteLine( formatter, "decimal argument",
            "long/exception", "ulong/exception" );
        Console.WriteLine( formatter, "----------------",
            "--------------", "---------------" );

        // Convert decimal values and display the results.
        DecimalToU_Int64( 123M );
        DecimalToU_Int64( new decimal( 123000, 0, 0, false, 3 ) );
        DecimalToU_Int64( 123.999M );
        DecimalToU_Int64( 18446744073709551615.999M );
        DecimalToU_Int64( 18446744073709551616M );
        DecimalToU_Int64( 9223372036854775807.999M );
        DecimalToU_Int64( 9223372036854775808M );
        DecimalToU_Int64( - 0.999M );
        DecimalToU_Int64( - 1M );
        DecimalToU_Int64( - 9223372036854775808.999M );
        DecimalToU_Int64( - 9223372036854775809M );
    }
}

/*
This example of the explicit conversions from decimal to long
and decimal to ulong generates the following output. It displays
several converted decimal values.

         decimal argument        long/exception       ulong/exception
         ----------------        --------------       ---------------
                      123                   123                   123
                  123.000                   123                   123
                  123.999                   123                   123
 18446744073709551615.999     OverflowException  18446744073709551615
     18446744073709551616     OverflowException     OverflowException
  9223372036854775807.999   9223372036854775807   9223372036854775807
      9223372036854775808     OverflowException   9223372036854775808
                   -0.999                     0                     0
                       -1                    -1     OverflowException
 -9223372036854775808.999  -9223372036854775808     OverflowException
     -9223372036854775809     OverflowException     OverflowException
*/

// Example of the explicit conversions from decimal to long and
// decimal to ulong.
let print obj1 obj2 obj3 = printfn $"{obj1,25}{obj2,22}{obj3,22}"

// Get the exception type name; remove the namespace prefix.
let getExceptionType (ex: exn) =
    let exceptionType = ex.GetType() |> string
    exceptionType.Substring(exceptionType.LastIndexOf '.' + 1)

// Convert the decimal argument; catch exceptions that are thrown.
let decimalToU_Int64 (argument: decimal) =
    let int32Value: obj =
        // Convert the argument to a int64 value.
        try
            int32 argument
        with ex -> getExceptionType ex

    let uint32Value: obj =
        // Convert the argument to a uint64 value.
        try
            uint32 argument
        with ex -> getExceptionType ex

    print argument int32Value uint32Value

printfn "This example of the explicit conversions from decimal to long\nand decimal to ulong generates the following output. It displays\nseveral converted decimal values.\n"

print "decimal argument" "long/exception" "ulong/exception"
print "----------------" "--------------" "---------------"

// Convert decimal values and display the results.
decimalToU_Int64 123M
decimalToU_Int64 (new decimal(123000, 0, 0, false, 3uy))
decimalToU_Int64 123.999M
decimalToU_Int64 18446744073709551615.999M
decimalToU_Int64 18446744073709551616M
decimalToU_Int64 9223372036854775807.999M
decimalToU_Int64 9223372036854775808M
decimalToU_Int64 -0.999M
decimalToU_Int64 -1M
decimalToU_Int64 -9223372036854775808.999M
decimalToU_Int64 -9223372036854775809M


// This example of the explicit conversions from decimal to long
// and decimal to ulong generates the following output. It displays
// several converted decimal values.
//
//          decimal argument        long/exception       ulong/exception
//          ----------------        --------------       ---------------
//                       123                   123                   123
//                   123.000                   123                   123
//                   123.999                   123                   123
//  18446744073709551615.999     OverflowException  18446744073709551615
//      18446744073709551616     OverflowException     OverflowException
//   9223372036854775807.999   9223372036854775807   9223372036854775807
//       9223372036854775808     OverflowException   9223372036854775808
//                    -0.999                     0                     0
//                        -1                    -1     OverflowException
//  -9223372036854775808.999  -9223372036854775808     OverflowException
//      -9223372036854775809     OverflowException     OverflowException

' Example of the explicit conversions from Decimal to Long and 
' Decimal to ULong.
Module DecimalToU_Int64Demo

    Const formatter As String = "{0,25}{1,22}{2,22}"

    ' Convert the decimal argument catch exceptions that are thrown.
    Public Sub DecimalToU_Int64(argument As Decimal)
        Dim Int64Value As Object
        Dim UInt64Value As Object

        ' Convert the argument to a long value.
        Try
            Int64Value = CLng(argument)
        Catch ex As Exception
            Int64Value = ex.GetType().Name
        End Try

        ' Convert the argument to a ulong value.
        Try
            UInt64Value = CULng(argument)
        Catch ex As Exception
            UInt64Value = ex.GetType().Name
        End Try

        Console.WriteLine(formatter, argument, _ 
            Int64Value, UInt64Value)
    End Sub

    Public Sub Main( )
        Console.WriteLine( formatter, "Decimal argument", _
            "Long/Exception", "ULong/Exception" )
        Console.WriteLine( formatter, "----------------", _
            "--------------", "---------------" )

        ' Convert decimal values and display the results.
        DecimalToU_Int64(123d)
        DecimalToU_Int64(New Decimal(123000, 0, 0, False, 3))
        DecimalToU_Int64(123.999d)
        DecimalToU_Int64(18446744073709551615.999d)
        DecimalToU_Int64(18446744073709551616d)
        DecimalToU_Int64(9223372036854775807.999d)
        DecimalToU_Int64(9223372036854775808d)
        DecimalToU_Int64(-0.999d)
        DecimalToU_Int64(-1d)
        DecimalToU_Int64(-9223372036854775808.999d)
        DecimalToU_Int64(-9223372036854775809d)
    End Sub
End Module
' The example displays the following output to the console:
'             Decimal argument        Long/Exception       ULong/Exception
'             ----------------        --------------       ---------------
'                          123                   123                   123
'                      123.000                   123                   123
'                      123.999                   124                   124
'     18446744073709551615.999     OverflowException     OverflowException
'         18446744073709551616     OverflowException     OverflowException
'      9223372036854775807.999     OverflowException   9223372036854775808
'          9223372036854775808     OverflowException   9223372036854775808
'                       -0.999                    -1     OverflowException
'                           -1                    -1     OverflowException
'     -9223372036854775808.999     OverflowException     OverflowException
'         -9223372036854775809     OverflowException     OverflowException

注解

此运算符支持将 a Decimal 显式转换为 .Int64 此类显式转换的语法依赖于语言，各个语言编译器可以提供不同的实现并返回不同的结果。当使用 C# 和 Visual Basic 显式将 Decimal 值转换为 Int64 值时，该示例说明了不同的返回值。若要执行独立于语言的转换，可以调用 Decimal.ToInt64(Decimal) 或 Convert.ToInt64(Decimal) 方法。

另请参阅

Int64

适用于

反馈

此页面是否有帮助？