项目
11/18/2011

UInt64.Parse Method (String)

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

Converts the string representation of a number to its 64-bit unsigned integer equivalent.

This API is not CLS-compliant. The CLS-compliant alternative is Parse(String).

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

Syntax

'Declaration
<CLSCompliantAttribute(False)> _
Public Shared Function Parse ( _
    s As String _
) As ULong

[CLSCompliantAttribute(false)]
public static ulong Parse(
    string s
)

Parameters

s
Type: System.String
A string that represents the number to convert.

Return Value

Type: System.UInt64
A 64-bit unsigned integer equivalent to the number contained in s.

Exceptions

Exception	Condition
ArgumentNullException	The s parameter is nulla null reference (Nothing in Visual Basic).
FormatException	The s parameter is not in the correct format.
OverflowException	The s parameter represents a number less than UInt64.MinValue or greater than UInt64.MaxValue.

Remarks

The s parameter should be the string representation of a number in the following form.

[ws][sign]digits[ws]

Elements in square brackets ([ and ]) are optional. The following table describes each element.

Element	Description
ws	Optional white space.
sign	An optional sign. Valid sign characters are determined by the NumberFormatInfo.NegativeSign and NumberFormatInfo.PositiveSign properties of the current culture. However, the negative sign symbol can be used only with zero; otherwise, the method throws an OverflowException.
digits	A sequence of digits ranging from 0 to 9. Any leading zeros are ignored.

Note:
The string specified by the s parameter is interpreted by using the NumberStyles.Integer style. It cannot contain any group separators or decimal separator, and it cannot have a decimal portion.

The s parameter is parsed by using the formatting information in a System.Globalization.NumberFormatInfo object that is initialized for the current system culture. For more information, see NumberFormatInfo.CurrentInfo. To parse a string by using the formatting information of a specific culture, use the Parse(String, IFormatProvider) method.

Examples

The following example uses the Parse method to parse an array of string values.

Dim values() As String = {"+13230", "-0", "1,390,146", "$190,235,421,127", _
                           "0xFA1B", "163042", "-10", "14065839182", _
                           "16e07", "134985.0", "-12034"}
For Each value As String In values
   Try
      Dim number As ULong = UInt64.Parse(value)
      outputBlock.Text += String.Format("{0} --> {1}", value, number) & vbCrLf
   Catch e As FormatException
      outputBlock.Text += String.Format("{0}: Bad Format", value) & vbCrLf
   Catch e As OverflowException
      outputBlock.Text += String.Format("{0}: Overflow", value) & vbCrLf
   End Try
Next
' The example displays the following output:
'       +13230 --> 13230
'       -0 --> 0
'       1,390,146: Bad Format
'       $190,235,421,127: Bad Format
'       0xFA1B: Bad Format
'       163042 --> 163042
'       -10: Overflow
'       14065839182 --> 14065839182
'       16e07: Bad Format
'       134985.0: Bad Format
'       -12034: Overflow

string[] values = { "+13230", "-0", "1,390,146", "$190,235,421,127",
                    "0xFA1B", "163042", "-10", "14065839182",
                    "16e07", "134985.0", "-12034" };
foreach (string value in values)
{
   try
   {
      ulong number = UInt64.Parse(value);
      outputBlock.Text += String.Format("{0} --> {1}", value, number) + "\n";
   }
   catch (FormatException)
   {
      outputBlock.Text += String.Format("{0}: Bad Format", value) + "\n";
   }
   catch (OverflowException)
   {
      outputBlock.Text += String.Format("{0}: Overflow", value) + "\n";
   }
}
// The example displays the following output:
//       +13230 --> 13230
//       -0 --> 0
//       1,390,146: Bad Format
//       $190,235,421,127: Bad Format
//       0xFA1B: Bad Format
//       163042 --> 163042
//       -10: Overflow
//       14065839182 --> 14065839182
//       16e07: Bad Format
//       134985.0: Bad Format
//       -12034: Overflow

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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