# UInt64.MaxValue Feld

## Definition

Stellt den größtmöglichen Wert von UInt64 dar.Represents the largest possible value of UInt64. Dieses Feld ist konstant.This field is constant.

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

## Beispiele

Im folgenden Beispiel werden die Felder MinValue und MaxValue verwendet, um zu überprüfen, ob sich ein Double Wert innerhalb des Bereichs des UInt64 Typs befindet, bevor eine Typkonvertierung durchführt.The following example uses the MinValue and MaxValue fields to verify that a Double value is within the range of the UInt64 type before it performs a type conversion. Dadurch wird eine OverflowException zur Laufzeit verhindert.This prevents an OverflowException at run time.

``````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);
}
``````
``````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
``````

## Hinweise

Der Wert dieser Konstante ist 18446744073709551615; Das heißt, hexadezimal 0xFFFFFFFFFFFFFFFF.The value of this constant is 18,446,744,073,709,551,615; that is, hexadecimal 0xFFFFFFFFFFFFFFFF.