RegistryKey.GetValue 方法

Source:

RegistryKey.cs

public:
 System::Object ^ GetValue(System::String ^ name, System::Object ^ defaultValue, Microsoft::Win32::RegistryValueOptions options);

public object? GetValue(string? name, object? defaultValue, Microsoft.Win32.RegistryValueOptions options);

public object GetValue(string name, object defaultValue, Microsoft.Win32.RegistryValueOptions options);

[System.Runtime.InteropServices.ComVisible(false)]
public object GetValue(string name, object defaultValue, Microsoft.Win32.RegistryValueOptions options);

member this.GetValue : string * obj * Microsoft.Win32.RegistryValueOptions -> obj

[<System.Runtime.InteropServices.ComVisible(false)>]
member this.GetValue : string * obj * Microsoft.Win32.RegistryValueOptions -> obj

Public Function GetValue (name As String, defaultValue As Object, options As RegistryValueOptions) As Object

参数

返回

与name指定的值关联的值，或者optionsdefaultValue如果未找到，则进行处理name。

属性

ComVisibleAttribute

例外

示例

下面的代码示例创建一个测试键，添加一个具有嵌入环境变量的值，并在扩展和未展开的表单中检索值。

#using <Microsoft.VisualBasic.dll>

using namespace System;
using namespace Microsoft::Win32;
using namespace Microsoft::VisualBasic;

int main()
{
    // Delete and recreate the test key.
    Registry::CurrentUser->DeleteSubKey( L"RegistryValueOptionsExample", false );
    RegistryKey ^ rk = 
        Registry::CurrentUser->CreateSubKey( L"RegistryValueOptionsExample" );
   
    // Add a value that contains an environment variable.
    rk->SetValue( L"ExpandValue", L"The path is %PATH%", 
        RegistryValueKind::ExpandString );
   
    // Retrieve the value, first without expanding the environment
    // variable and then expanding it.
    Console::WriteLine( L"Unexpanded: \"{0}\"", 
                        rk->GetValue( L"ExpandValue", 
                        L"No Value", 
                        RegistryValueOptions::DoNotExpandEnvironmentNames ) );
    Console::WriteLine( L"Expanded: \"{0}\"", rk->GetValue( L"ExpandValue" ) );
 
    return 0;
} //Main

using System;
using Microsoft.Win32;
using Microsoft.VisualBasic;

public class Example
{
    public static void Main()
    {
        // Delete and recreate the test key.
        Registry.CurrentUser.DeleteSubKey("RegistryValueOptionsExample", false);
        RegistryKey rk =
            Registry.CurrentUser.CreateSubKey("RegistryValueOptionsExample");

        // Add a value that contains an environment variable.
        rk.SetValue("ExpandValue", "The path is %PATH%", RegistryValueKind.ExpandString);

        // Retrieve the value, first without expanding the environment
        // variable and then expanding it.
        Console.WriteLine("Unexpanded: \"{0}\"",
            rk.GetValue("ExpandValue", "No Value",
            RegistryValueOptions.DoNotExpandEnvironmentNames));
        Console.WriteLine("Expanded: \"{0}\"", rk.GetValue("ExpandValue"));
    } //Main
} //Example

Imports Microsoft.Win32

Public Class Example
    Public Shared Sub Main()
        ' Delete and recreate the test key.
        Registry.CurrentUser.DeleteSubKey("RegistryValueOptionsExample", False)
        Dim rk As RegistryKey = _
            Registry.CurrentUser.CreateSubKey("RegistryValueOptionsExample")

        ' Add a value that contains an environment variable.
        rk.SetValue("ExpandValue", "The path is %PATH%", _
            RegistryValueKind.ExpandString)

        ' Retrieve the value, first without expanding the environment 
        ' variable and then expanding it.
        Console.WriteLine("Unexpanded: ""{0}""", _
            rk.GetValue("ExpandValue", "No Value", _
            RegistryValueOptions.DoNotExpandEnvironmentNames))
        Console.WriteLine("Expanded: ""{0}""", rk.GetValue("ExpandValue"))
    End Sub
End Class

注解

使用此重载指定检索值的特殊处理。 例如，可以在检索类型的RegistryValueOptions.DoNotExpandEnvironmentNames注册表值以检索字符串时指定RegistryValueKind.ExpandString，而无需扩展嵌入的环境变量。

使用 defaultValue 参数指定要返回的值（如果 name 不存在）。

另请参阅

• RegistryValueOptions
• GetValueNames()
• SetValue
• DeleteValue(String)
• ValueCount
• GetSubKeyNames()

Source:

RegistryKey.cs

public:
 System::Object ^ GetValue(System::String ^ name);

public object? GetValue(string? name);

public object GetValue(string name);

member this.GetValue : string -> obj

Public Function GetValue (name As String) As Object

参数

返回

与或namenull找不到关联的name值。

例外

示例

下面的代码示例创建一个测试键，并将不同数据类型的值添加到该键。 然后，该示例读取名称/值对并将其显示给控制台，方法是使用 GetValueKind 该方法检索相应的注册表数据类型。

using namespace System;
using namespace Microsoft::Win32;
int main()
{
   
   // Delete and recreate the test key.
   Registry::CurrentUser->DeleteSubKey( "RegistryValueKindExample", false );
   RegistryKey ^ rk = Registry::CurrentUser->CreateSubKey( "RegistryValueKindExample" );
   
   // Create name/value pairs.
   // This overload supports QWord (long) values. 
   rk->SetValue( "QuadWordValue", 42, RegistryValueKind::QWord );
   
   // The following SetValue calls have the same effect as using the
   // SetValue overload that does not specify RegistryValueKind.
   //
   rk->SetValue( "DWordValue", 42, RegistryValueKind::DWord );
   rk->SetValue( "MultipleStringValue", gcnew array<String^>{
      "One","Two","Three"
   }, RegistryValueKind::MultiString );
   rk->SetValue( "BinaryValue", gcnew array<Byte>{
      10,43,44,45,14,255
   }, RegistryValueKind::Binary );
   rk->SetValue( "StringValue", "The path is %PATH%", RegistryValueKind::String );
   
   // This overload supports setting expandable string values. Compare
   // the output from this value with the previous string value.
   rk->SetValue( "ExpandedStringValue", "The path is %PATH%", RegistryValueKind::ExpandString );
   
   // Display all the name/value pairs stored in the test key, with the
   // registry data type in parentheses.
   //
   array<String^>^valueNames = rk->GetValueNames();
   System::Collections::IEnumerator^ myEnum = valueNames->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      String^ s = safe_cast<String^>(myEnum->Current);
      RegistryValueKind rvk = rk->GetValueKind( s );
      switch ( rvk )
      {
         case RegistryValueKind::MultiString:
         {
            array<String^>^values = (array<String^>^)rk->GetValue( s );
            Console::Write( "\r\n {0} ({1}) =", s, rvk );
            for ( int i = 0; i < values->Length; i++ )
            {
               if (i != 0) Console::Write(",");
               Console::Write( " \"{0}\"", values[ i ] );

            }
            Console::WriteLine();
            break;
         }
         case RegistryValueKind::Binary:
         {
            array<Byte>^bytes = (array<Byte>^)rk->GetValue( s );
            Console::Write( "\r\n {0} ({1}) =", s, rvk );
            for ( int i = 0; i < bytes->Length; i++ )
            {
               
               // Display each byte as two hexadecimal digits.
               Console::Write( " {0:X2}", bytes[ i ] );

            }
            Console::WriteLine();
            break;
         }
         default:
            Console::WriteLine( "\r\n {0} ({1}) = {2}", s, rvk, rk->GetValue( s ) );
            break;
      }
   }
}
/*

This code example produces the following output:
 QuadWordValue (QWord) = 42

 DWordValue (DWord) = 42

 MultipleStringValue (MultiString) =, "One", "Two", "Three"

 BinaryValue (Binary) = 0A 2B 2C 2D 0E FF

 StringValue (String) = The path is %PATH%

 ExpandedStringValue (ExpandString) = The path is C:\Program Files\Microsoft.NET\SDK\v2.0\Bin;
 [***The remainder of this output is omitted.***]

*/

using System;
using Microsoft.Win32;

public class Example
{
    public static void Main()
    {
        // Delete and recreate the test key.
        Registry.CurrentUser.DeleteSubKey("RegistryValueKindExample", false);
        RegistryKey rk = Registry.CurrentUser.CreateSubKey("RegistryValueKindExample");

        // Create name/value pairs.

        // This overload supports QWord (long) values.
        rk.SetValue("QuadWordValue", 42, RegistryValueKind.QWord);

        // The following SetValue calls have the same effect as using the
        // SetValue overload that does not specify RegistryValueKind.
        //
        rk.SetValue("DWordValue", 42, RegistryValueKind.DWord);
        rk.SetValue("MultipleStringValue", new string[] {"One", "Two", "Three"}, RegistryValueKind.MultiString);
        rk.SetValue("BinaryValue", new byte[] {10, 43, 44, 45, 14, 255}, RegistryValueKind.Binary);
        rk.SetValue("StringValue", "The path is %PATH%", RegistryValueKind.String);

        // This overload supports setting expandable string values. Compare
        // the output from this value with the previous string value.
        rk.SetValue("ExpandedStringValue", "The path is %PATH%", RegistryValueKind.ExpandString);

        // Display all name/value pairs stored in the test key, with each
        // registry data type in parentheses.
        //
        string[] valueNames = rk.GetValueNames();
        foreach (string s in valueNames)
        {
            RegistryValueKind rvk = rk.GetValueKind(s);
            switch (rvk)
            {
                case RegistryValueKind.MultiString :
                    string[] values = (string[]) rk.GetValue(s);
                    Console.Write("\r\n {0} ({1}) =", s, rvk);
                    for (int i = 0; i < values.Length; i++)
                    {
                        if (i != 0) Console.Write(",");
                        Console.Write(" \"{0}\"", values[i]);
                    }
                    Console.WriteLine();
                    break;

                case RegistryValueKind.Binary :
                    byte[] bytes = (byte[]) rk.GetValue(s);
                    Console.Write("\r\n {0} ({1}) =", s, rvk);
                    for (int i = 0; i < bytes.Length; i++)
                    {
                        // Display each byte as two hexadecimal digits.
                        Console.Write(" {0:X2}", bytes[i]);
                    }
                    Console.WriteLine();
                    break;

                default :
                    Console.WriteLine("\r\n {0} ({1}) = {2}", s, rvk, rk.GetValue(s));
                    break;
            }
        }
    }
}
/*

This code example produces the following output:
 QuadWordValue (QWord) = 42

 DWordValue (DWord) = 42

 MultipleStringValue (MultiString) =, "One", "Two", "Three"

 BinaryValue (Binary) = 0A 2B 2C 2D 0E FF

 StringValue (String) = The path is %PATH%

 ExpandedStringValue (ExpandString) = The path is C:\Program Files\Microsoft.NET\SDK\v2.0\Bin;
 [***The remainder of this output is omitted.***]

*/

Imports Microsoft.Win32

Public Class Example
    Public Shared Sub Main()
        ' Delete and recreate the test key.
        Registry.CurrentUser.DeleteSubKey("RegistryValueKindExample", False)
        Dim rk As RegistryKey = Registry.CurrentUser.CreateSubKey("RegistryValueKindExample")

        ' Create name/value pairs.
        ' This overload supports QWord (long) values.
        rk.SetValue("QuadWordValue", 42, RegistryValueKind.QWord)

        ' The following SetValue calls have the same effect as using the
        ' SetValue overload that does not specify RegistryValueKind.
        '
        rk.SetValue("DWordValue", 42, RegistryValueKind.DWord)
        rk.SetValue("MultipleStringValue", New String() {"One", "Two", "Three"}, RegistryValueKind.MultiString)
        rk.SetValue("BinaryValue", New Byte() {10, 43, 44, 45, 14, 255}, RegistryValueKind.Binary)
        rk.SetValue("StringValue", "The path is %PATH%", RegistryValueKind.String)

        ' This overload supports setting expandable string values. Compare
        ' the output from this value with the previous string value.
        rk.SetValue("ExpandedStringValue", "The path is %PATH%", RegistryValueKind.ExpandString)


        ' Display all name/value pairs stored in the test key, with each
        ' registry data type in parentheses.
        '
        Dim valueNames As String() = rk.GetValueNames()
        Dim s As String
        For Each s In  valueNames
            Dim rvk As RegistryValueKind = rk.GetValueKind(s)
            Select Case rvk
                Case RegistryValueKind.MultiString
                    Dim values As String() = CType(rk.GetValue(s), String())
                    Console.Write(vbCrLf & " {0} ({1}) =", s, rvk)
                    For i As Integer = 0 To values.Length - 1
                        If i <> 0 Then Console.Write(",")
                        Console.Write(" ""{0}""", values(i))
                    Next i
                    Console.WriteLine()

                Case RegistryValueKind.Binary
                    Dim bytes As Byte() = CType(rk.GetValue(s), Byte())
                    Console.Write(vbCrLf & " {0} ({1}) =", s, rvk)
                    For i As Integer = 0 To bytes.Length - 1
                        ' Display each byte as two hexadecimal digits.
                        Console.Write(" {0:X2}", bytes(i))
                    Next i
                    Console.WriteLine()

                Case Else
                    Console.WriteLine(vbCrLf & " {0} ({1}) = {2}", s, rvk, rk.GetValue(s))
            End Select
        Next s
    End Sub
End Class

'
'This code example produces the following output (some output is omitted):
'
' QuadWordValue (QWord) = 42
'
' DWordValue (DWord) = 42
'
' MultipleStringValue (MultiString) = "One", "Two", "Three"
'
' BinaryValue (Binary) = 0A 2B 2C 2D 0E FF
'
' StringValue (String) = The path is %PATH%
'
' ExpandedStringValue (ExpandString) = The path is C:\Program Files\Microsoft.NET\SDK\v2.0\Bin;
' [***The remainder of this output is omitted.***]

注解

GetValue当方法检索可扩展的字符串值时（RegistryValueKind.ExpandString），它使用本地环境中的数据扩展环境字符串。 若要从远程计算机上的注册表中检索可扩展字符串值，请使用 GetValue(String, Object, RegistryValueOptions) 方法重载指定不希望展开环境字符串。

另请参阅

• GetValueNames()
• SetValue
• DeleteValue(String)
• ValueCount
• GetSubKeyNames()

Source:

RegistryKey.cs

public:
 System::Object ^ GetValue(System::String ^ name, System::Object ^ defaultValue);

public object? GetValue(string? name, object? defaultValue);

public object GetValue(string name, object defaultValue);

member this.GetValue : string * obj -> obj

Public Function GetValue (name As String, defaultValue As Object) As Object

参数

返回

与name任何嵌入环境变量关联的值未展开，或者defaultValuename找不到。

例外

示例

下面的代码示例使用值创建一个测试键并检索该值。 然后，该示例尝试从键中检索不存在的值;在这种情况下，该方法 GetValue 返回指定的默认值。

using namespace System;
using namespace Microsoft::Win32;

public ref class RegGetDef
{
public:
    static void Main()
    {
        // Create a reference to a valid key.  In order for this code to
        // work, the indicated key must have been created previously.
        // The key name is not case-sensitive.
        RegistryKey^ rk = Registry::LocalMachine->OpenSubKey("Software\\myTestKey", false);
        // Get the value from the specified name/value pair in the key.
        String^ valueName = "myTestValue";

        Console::WriteLine("Retrieving registry value ...");
        Console::WriteLine();
        Object^ o = rk->GetValue(valueName);
        Console::WriteLine("Object Type = " + o->GetType()->FullName);
        Console::WriteLine();
        switch (rk->GetValueKind(valueName))
        {
            case RegistryValueKind::String:
            case RegistryValueKind::ExpandString:
                Console::WriteLine("Value = " + o);
                break;
            case RegistryValueKind::Binary:
                for each (Byte^ b in (array<Byte^>^)o)
                {
                    Console::Write("{0:x2} ", b);
                }
                Console::WriteLine();
                break;
            case RegistryValueKind::DWord:
                Console::WriteLine("Value = " + Convert::ToString((Int32^)o));
                break;
            case RegistryValueKind::QWord:
                Console::WriteLine("Value = " + Convert::ToString((Int64^)o));
                break;
            case RegistryValueKind::MultiString:
                for each (String^ s in (array<String^>^)o)
                {
                    Console::Write("[{0:s}], ", s);
                }
                Console::WriteLine();
                break;
            default:
                Console::WriteLine("Value = (Unknown)");
                break;
        }

        // Attempt to retrieve a value that does not exist; the specified
        // default value is returned.
        String^ def = (String^)rk->GetValue("notavalue", "The default to return");
        Console::WriteLine();
        Console::WriteLine(def);
        
        rk->Close();
    }
};

int main()
{
    RegGetDef::Main();
}
/*
Output:
Retrieving registry value ...

Object Type = System.String

Value = testData

The default to return
*/

using System;
using Microsoft.Win32;

class RegGetDef
{
    public static void Main()
    {
        // Create a reference to a valid key.  In order for this code to
        // work, the indicated key must have been created previously.
        // The key name is not case-sensitive.
        RegistryKey rk = Registry.LocalMachine.OpenSubKey("Software\\myTestKey", false);
        // Get the value from the specified name/value pair in the key.

        string valueName = "myTestValue";

        Console.WriteLine("Retrieving registry value ...");
        Console.WriteLine();
        object o = rk.GetValue(valueName);
        Console.WriteLine("Object Type = " + o.GetType().FullName);
        Console.WriteLine();
        switch (rk.GetValueKind(valueName))
        {
            case RegistryValueKind.String:
            case RegistryValueKind.ExpandString:
                Console.WriteLine("Value = " + o);
                break;
            case RegistryValueKind.Binary:
                foreach (byte b in (byte[])o)
                {
                    Console.Write("{0:x2} ", b);
                }
                Console.WriteLine();
                break;
            case RegistryValueKind.DWord:
                Console.WriteLine("Value = " + Convert.ToString((int)o));
                break;
            case RegistryValueKind.QWord:
                Console.WriteLine("Value = " + Convert.ToString((Int64)o));
                break;
            case RegistryValueKind.MultiString:
                foreach (string s in (string[])o)
                {
                    Console.Write("[{0:s}], ", s);
                }
                Console.WriteLine();
                break;
            default:
                Console.WriteLine("Value = (Unknown)");
                break;
        }

        // Attempt to retrieve a value that does not exist; the specified
        // default value is returned.
        string def = (string)rk.GetValue("notavalue", "The default to return");
        Console.WriteLine();
        Console.WriteLine(def);

        rk.Close();
    }
}
/*
Output:
Retrieving registry value ...

Object Type = System.String

Value = testData

The default to return
*/

Imports Microsoft.Win32

Public Class RegGetDef
    Public Shared Sub Main()
        ' Create a reference to a valid key.  In order for this code to
        ' work, the indicated key must have been created previously.
        ' The key name is not case-sensitive.
        Dim rk As RegistryKey = Registry.LocalMachine.OpenSubKey("Software\myTestKey", false)

        ' Get the value from the specified name/value pair in the key.
        Dim valueName As String = "myTestValue"

        Console.WriteLine("Retrieving registry value ...")
        Console.WriteLine()
        Dim o As Object = rk.GetValue(valueName)
        Console.WriteLine("Object Type = " + o.GetType().FullName)
        Console.WriteLine()
        Select Case rk.GetValueKind(valueName)
            Case RegistryValueKind.String
            Case RegistryValueKind.ExpandString
                Console.WriteLine("Value = " + o)
            Case RegistryValueKind.Binary
                For Each b As Byte In CType(o,Byte())
                    Console.Write("{0:x2} ", b)
                Next b
                Console.WriteLine()
            Case RegistryValueKind.DWord
                Console.WriteLine("Value = " + Convert.ToString(CType(o,Int32)))
            Case RegistryValueKind.QWord
                Console.WriteLine("Value = " + Convert.ToString(CType(o,Int64)))
            Case RegistryValueKind.MultiString
                For Each s As String In CType(o,String())
                    Console.Write("[{0:s}], ", s)
                Next s
                Console.WriteLine()
            Case Else
                Console.WriteLine("Value = (Unknown)")
        End Select

        ' Attempt to retrieve a value that does not exist; the specified
        ' default value is returned.
        Dim Def As String = rk.GetValue("notavalue", "The default to return")
        Console.WriteLine()
        Console.WriteLine(def)

        rk.Close()
    End Sub
End Class
'
' Output:
' Retrieving registry value ...
'
' Object Type = System.String
'
' Value = testData
'
'The default to return

注解

使用此重载 GetValue 来处理名称尚不存在的情况- 例如，首次运行应用程序时。 每当调用此重载时，请使用 defaultValue 参数指定要返回的值（如果 name 不存在）。

GetValue当方法检索可扩展的字符串值时（RegistryValueKind.ExpandString），它使用本地环境中的数据扩展环境字符串。 若要从远程计算机上的注册表中检索可扩展字符串值，请使用 GetValue 重载指定不希望展开环境字符串。

另请参阅

• GetValueNames()
• SetValue
• DeleteValue(String)
• ValueCount
• GetSubKeyNames()