# UInt64.MaxValue Champ

## Définition

Représente la plus grande valeur possible de UInt64.Represents the largest possible value of UInt64. Ce champ est constant.This field is constant.

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

## Exemples

L’exemple suivant utilise les champs MinValue et MaxValue pour vérifier qu’une valeur de Double est comprise dans la plage du type de UInt64 avant d’effectuer une conversion de type.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. Cela empêche une OverflowException au moment de l’exécution.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
``````

## Remarques

La valeur de cette constante est 18446744073709551615 ; c’est-à-dire, hexadécimal 0xFFFFFFFFFFFFFFFF.The value of this constant is 18,446,744,073,709,551,615; that is, hexadecimal 0xFFFFFFFFFFFFFFFF.