UInt64.MaxValue Veld

Definitie

Naamruimte:
System
Assembly's:
mscorlib.dll, System.Runtime.dll
Assembly:
mscorlib.dll
Assembly:
System.Runtime.dll
Assembly:
netstandard.dll

Vertegenwoordigt de grootst mogelijke waarde van UInt64. Dit veld is constant.

public: System::UInt64 MaxValue = 18446744073709551615;
public const ulong MaxValue = 18446744073709551615;
val mutable MaxValue : uint64
Public Const MaxValue As ULong  = 18446744073709551615

Waarde van veld

Value = 18446744073709551615
UInt64

Voorbeelden

In het volgende voorbeeld worden de MinValue en MaxValue velden gebruikt om te controleren of een Double waarde binnen het bereik van het UInt64 type valt voordat een typeconversie wordt uitgevoerd. Dit voorkomt een OverflowException runtime.

double decimalValue = -1.5;
ulong integerValue; 

// Discard fractional portion of Double value
double decimalInteger = Math.Floor(decimalValue);

if (decimalInteger <= ulong.MaxValue && 
    decimalInteger >= ulong.MinValue)
{    
   integerValue = (ulong) decimalValue;
   Console.WriteLine("Converted {0} to {1}.", decimalValue, integerValue);
}   
else
{
   ulong rangeLimit;
   string relationship;
   
   if (decimalInteger > ulong.MaxValue)
   {
      rangeLimit = ulong.MaxValue;
      relationship = "greater";
   }   
   else
   {
      rangeLimit = ulong.MinValue;
      relationship = "less";
   }       

   Console.WriteLine("Conversion failure: {0} is {1} than {2}.",  
                     decimalInteger, 
                     relationship, 
                     rangeLimit);
}

open System

let decimalValue = -1.5

// Discard fractional portion of Double value
let decimalInteger = floor decimalValue

if decimalInteger <= float UInt64.MaxValue && decimalInteger >= float UInt64.MinValue then
    let integerValue = uint64 decimalValue
    printfn $"Converted {decimalValue} to {integerValue}."
else
    let rangeLimit, relationship =
        if decimalInteger > float UInt64.MaxValue then
            UInt64.MaxValue, "greater"
        else
            UInt64.MinValue, "less"

    printfn $"Conversion failure: {decimalInteger} is {relationship} than {rangeLimit}."

Dim decimalValue As Double = -1.5
Dim integerValue As ULong 

' Discard fractional portion of Double value
Dim decimalInteger As Double = Math.Floor(decimalValue)

If decimalInteger <= ULong.MaxValue AndAlso _
   decimalInteger >= ULong.MinValue Then
   integerValue = CULng(decimalValue)
   Console.WriteLine("Converted {0} to {1}.", decimalValue, integerValue)
Else
   Dim rangeLimit As ULong
   Dim relationship As String
   
   If decimalInteger > ULong.MaxValue Then
      rangeLimit = ULong.MaxValue
      relationship = "greater"
   Else
      rangeLimit = ULong.MinValue
      relationship = "less"
   End If       

   Console.WriteLine("Conversion failure: {0} is {1} than {2}", _ 
                     decimalInteger, _
                     relationship, _
                     rangeLimit)
End If

Opmerkingen

De waarde van deze constante is 18.446.744.073.709.551.615; hexadecimale 0xFFFFFFFFFFFFFFFF.

Van toepassing op

Zie ook