ToUInt64 Method (String, IFormatProvider)

Convert.ToUInt64 Method (String, IFormatProvider)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Converts the specified String representation of a number to an equivalent 64-bit unsigned integer using the specified culture-specific formatting information.

This API is not CLS-compliant. 

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

'Declaration
<CLSCompliantAttribute(False)> _
Public Shared Function ToUInt64 ( _
	value As String, _
	provider As IFormatProvider _
) As ULong

Parameters

value
Type: System.String
A String containing a number to convert.
provider
Type: System.IFormatProvider
An IFormatProvider interface implementation that supplies culture-specific formatting information.

Return Value

Type: System.UInt64
A 64-bit unsigned integer equivalent to the value of value.
-or-
Zero if value is Nothing.

ExceptionCondition
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.

The return value is the result of invoking UInt64.Parse on value.

provider is an IFormatProvider instance that obtains a NumberFormatInfo object. The NumberFormatInfo object provides culture-specific information about the format of value. If provider is Nothing, the NumberFormatInfo for the current culture is used.

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.

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


' 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


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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