UInt64.MinValue 字段
重要
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表示 UInt64 的最小可能值。 此字段为常数。
public: System::UInt64 MinValue = 0;C#
public const ulong MinValue = 0;val mutable MinValue : uint64Public Const MinValue As ULong = 0以下示例使用 MinValue 和 MaxValue 字段来验证 Double 值在执行类型转换之前是否在类型范围内 UInt64 。 这可以防止 OverflowException 在运行时出现 。
C#
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
此常量的值为 0。
| 产品 | 版本 |
|---|---|
| .NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10 |
| .NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| .NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1 |
| UWP | 10.0 |
