Convert.ToUInt64 Method (String)

Converts the specified String representation of a number to an equivalent 64-bit unsigned integer.

This API is not CLS-compliant. 

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

Syntax

'Declaration
<CLSCompliantAttribute(False)> _
Public Shared Function ToUInt64 ( _
    value As String _
) As ULong
[CLSCompliantAttribute(false)]
public static ulong ToUInt64(
    string value
)

Parameters

Return Value

Type: System.UInt64
A 64-bit signed integer equivalent to the value of value.
-or-
Zero if value is nulla null reference (Nothing in Visual Basic).

Exceptions

Exception Condition
FormatException

value does not consist of an optional sign followed by a sequence of digits (zero through nine).

OverflowException

value represents a number less than MinValue or greater than MaxValue.

Remarks

The return value is the result of invoking the Int64.Parse method on value.

If you prefer not to handle an exception if the conversion fails, you can call the UInt64.TryParse method instead. It returns a Boolean value that indicates whether the conversion succeeded or failed.

Examples

The following code example converts String representations of 64-bit unsigned integers with the ToUInt64 method, using default formatting.

' Example of the Convert.ToUInt64( String ) and 
' Convert.ToUInt64( String, IFormatProvider ) methods.
Imports System.Globalization

Module Example

   Dim format As String = "{0,-24}{1,-22}{2}"

   ' Get the exception type name; remove the namespace prefix.
   Function GetExceptionType(ByVal ex As Exception) As String

      Dim exceptionType As String = ex.GetType().ToString()
      Return exceptionType.Substring( _
          exceptionType.LastIndexOf("."c) + 1)
   End Function

   Sub ConvertToUInt64(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal numericStr As String, _
       ByVal provider As IFormatProvider)

      Dim defaultValue As Object
      Dim providerValue As Object

      ' Convert numericStr to UInt64 without a format provider.
      Try
         defaultValue = Convert.ToUInt64(numericStr)
      Catch ex As Exception
         defaultValue = GetExceptionType(ex)
      End Try

      ' Convert numericStr to UInt64 with a format provider.
      Try
         providerValue = Convert.ToUInt64(numericStr, provider)
      Catch ex As Exception
         providerValue = GetExceptionType(ex)
      End Try

      outputBlock.Text &= String.Format(format, numericStr, _
          defaultValue, providerValue) & vbCrLf
   End Sub

   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)

      ' Create a NumberFormatInfo object and set several of its
      ' properties that apply to numbers.
      Dim provider As NumberFormatInfo = New NumberFormatInfo()

      ' These properties affect the conversion.
      provider.PositiveSign = "pos "
      provider.NegativeSign = "neg "

      ' These properties do not affect the conversion.
      ' The input string cannot have decimal and group separators.
      provider.NumberDecimalSeparator = "."
      provider.NumberGroupSeparator = ","
      provider.NumberGroupSizes = New Integer() {3}

      outputBlock.Text &= String.Format("This example of" & vbCrLf & _
          "  Convert.ToUInt64( String ) and " & vbCrLf & _
          "  Convert.ToUInt64( String, IFormatProvider ) " & _
          vbCrLf & "generates the following output. It " & _
          "converts several strings to unsigned " & vbCrLf & _
          "Long values, using default formatting " & _
          "or a NumberFormatInfo object." & vbCrLf) & vbCrLf
      outputBlock.Text &= String.Format(format, "String to convert", _
          "Default/exception", "Provider/exception") & vbCrLf
      outputBlock.Text &= String.Format(format, "-----------------", _
          "-----------------", "------------------") & vbCrLf

      ' Convert strings, with and without an IFormatProvider.
      ConvertToUInt64(outputBlock, "123456789012", provider)
      ConvertToUInt64(outputBlock, "+123456789012", provider)
      ConvertToUInt64(outputBlock, "pos 123456789012", provider)
      ConvertToUInt64(outputBlock, "123456789012.", provider)
      ConvertToUInt64(outputBlock, "123,456,789,012", provider)
      ConvertToUInt64(outputBlock, "18446744073709551615", provider)
      ConvertToUInt64(outputBlock, "18446744073709551616", provider)
      ConvertToUInt64(outputBlock, "-1", provider)
   End Sub
End Module

' This example of
'   Convert.ToUInt64( String ) and
'   Convert.ToUInt64( String, IFormatProvider )
' generates the following output. It converts several strings to unsigned
' Long values, using default formatting or a NumberFormatInfo object.
' 
' String to convert       Default/exception     Provider/exception
' -----------------       -----------------     ------------------
' 123456789012            123456789012          123456789012
' +123456789012           123456789012          FormatException
' pos 123456789012        FormatException       123456789012
' 123456789012.           FormatException       FormatException
' 123,456,789,012         FormatException       FormatException
' 18446744073709551615    18446744073709551615  18446744073709551615
' 18446744073709551616    OverflowException     OverflowException
' -1                      OverflowException     FormatException
// Example of the Convert.ToUInt64( string ) and 
// Convert.ToUInt64( string, IFormatProvider ) methods.
using System;
using System.Globalization;

class Example
{
   static string format = "{0,-24}{1,-22}{2}";

   // Get the exception type name; remove the namespace prefix.
   static string GetExceptionType(Exception ex)
   {
      string exceptionType = ex.GetType().ToString();
      return exceptionType.Substring(
          exceptionType.LastIndexOf('.') + 1);
   }

   static void ConvertToUInt64(System.Windows.Controls.TextBlock outputBlock, string numericStr,
       IFormatProvider provider)
   {
      object defaultValue;
      object providerValue;

      // Convert numericStr to UInt64 without a format provider.
      try
      {
         defaultValue = Convert.ToUInt64(numericStr);
      }
      catch (Exception ex)
      {
         defaultValue = GetExceptionType(ex);
      }

      // Convert numericStr to UInt64 with a format provider.
      try
      {
         providerValue = Convert.ToUInt64(numericStr, provider);
      }
      catch (Exception ex)
      {
         providerValue = GetExceptionType(ex);
      }

      outputBlock.Text += String.Format(format, numericStr,
          defaultValue, providerValue) + "\n";
   }

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      // Create a NumberFormatInfo object and set several of its
      // properties that apply to numbers.
      NumberFormatInfo provider = new NumberFormatInfo();

      // These properties affect the conversion.
      provider.NegativeSign = "neg ";
      provider.PositiveSign = "pos ";

      // These properties do not affect the conversion.
      // The input string cannot have decimal and group separators.
      provider.NumberDecimalSeparator = ".";
      provider.NumberGroupSeparator = ",";
      provider.NumberGroupSizes = new int[] { 3 };

      outputBlock.Text += String.Format("This example of\n" +
          "  Convert.ToUInt64( string ) and \n" +
          "  Convert.ToUInt64( string, IFormatProvider ) " +
          "\ngenerates the following output. It converts " +
          "several strings to \nulong values, using " +
          "default formatting or a NumberFormatInfo object.\n") + "\n";
      outputBlock.Text += String.Format(format, "String to convert",
          "Default/exception", "Provider/exception") + "\n";
      outputBlock.Text += String.Format(format, "-----------------",
          "-----------------", "------------------") + "\n";

      // Convert strings, with and without an IFormatProvider.
      ConvertToUInt64(outputBlock, "123456789012", provider);
      ConvertToUInt64(outputBlock, "+123456789012", provider);
      ConvertToUInt64(outputBlock, "pos 123456789012", provider);
      ConvertToUInt64(outputBlock, "123456789012.", provider);
      ConvertToUInt64(outputBlock, "123,456,789,012", provider);
      ConvertToUInt64(outputBlock, "18446744073709551615", provider);
      ConvertToUInt64(outputBlock, "18446744073709551616", provider);
      ConvertToUInt64(outputBlock, "-1", provider);
   }
}

/*
This example of
  Convert.ToUInt64( string ) and
  Convert.ToUInt64( string, IFormatProvider )
generates the following output. It converts several strings to
ulong values, using default formatting or a NumberFormatInfo object.

String to convert       Default/exception     Provider/exception
-----------------       -----------------     ------------------
123456789012            123456789012          123456789012
+123456789012           123456789012          FormatException
pos 123456789012        FormatException       123456789012
123456789012.           FormatException       FormatException
123,456,789,012         FormatException       FormatException
18446744073709551615    18446744073709551615  18446744073709551615
18446744073709551616    OverflowException     OverflowException
-1                      OverflowException     FormatException
*/

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.