UInt64.MaxValue フィールド
定義
public: System::UInt64 MaxValue = 18446744073709551615;
public const ulong MaxValue = 18446744073709551615;
val mutable MaxValue : uint64
Public Const MaxValue As ULong = 18446744073709551615
フィールド値
例
次の例では、フィールドとフィールドを使用して、 MinValue MaxValue Double UInt64 型変換を実行する前に、値が型の範囲内にあることを確認します。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. これにより、実行時にが発生しなくなり OverflowException ます。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
注釈
この定数の値は18446744073709551615です。つまり、16進数の0xFFFFFFFFFFFFFFFF です。The value of this constant is 18,446,744,073,709,551,615; that is, hexadecimal 0xFFFFFFFFFFFFFFFF.