Статья
11/18/2011

UInt64.MinValue Field

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Represents the smallest possible value of UInt64. This field is constant.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

Syntax

'Declaration
Public Const MinValue As ULong

public const ulong MinValue

Remarks

The value of this constant is 0.

Examples

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. This prevents an OverflowException at run time.

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)
   outputBlock.Text += String.Format("Converted {0} to {1}.", decimalValue, integerValue) + vbCrLf
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

   outputBlock.Text += String.Format("Conversion failure: {0} is {1} than {2}", _
                     decimalInteger, _
                     relationship, _
                     rangeLimit) + vbCrLf
End If

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;
   outputBlock.Text += String.Format("Converted {0} to {1}.", decimalValue, integerValue) + "\n";
}
else
{
   ulong rangeLimit;
   string relationship;

   if (decimalInteger > ulong.MaxValue)
   {
      rangeLimit = ulong.MaxValue;
      relationship = "greater";
   }
   else
   {
      rangeLimit = ulong.MinValue;
      relationship = "less";
   }

   outputBlock.Text += String.Format("Conversion failure: {0} is {1} than {2}.",
                     decimalInteger,
                     relationship,
                     rangeLimit) + "\n";
}

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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