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Int64.Parse Method (String)

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

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

Public Shared Function Parse ( _
	s As String _
) As Long


Type: System.String
A string containing a number to convert.

Return Value

Type: System.Int64
A 64-bit signed integer equivalent to the number contained in s.


s is Nothing.


s is not in the correct format.


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

The s parameter contains a number of the form:


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




Optional white space.


An optional sign.


A sequence of digits ranging from 0 to 9.

The s parameter is interpreted using the NumberStyles.Integer style. In addition to decimal digits, only leading and trailing spaces together with a leading sign are allowed. To explicitly define the style elements that can be present in s, use either the Int64.Parse(String, NumberStyles) or the Int64.Parse(String, NumberStyles, IFormatProvider) method.

The s parameter is parsed using the formatting information in a NumberFormatInfo object that is initialized for the current system culture. To parse a string using the formatting information of some other culture, use the Int64.Parse(String, NumberStyles, IFormatProvider) method.

The following example demonstrates how to convert a string value into a 64-bit signed integer value using the Int64.Parse(String) method. It then displays the resulting long integer value.

Module ParseInt64
   Public Sub Main()
      Convert("  179032  ")
      Convert(" -2041326 ")
      Convert(" +8091522 ")
      Convert("   1064.0   ")
      Convert("  178.3")
      Convert((CDec(Int64.MaxValue) + 1).ToString())
   End Sub

   Private Sub Convert(value As String)
         Dim number As Long = Int64.Parse(value)
         Console.WriteLine("Converted '{0}' to {1}.", value, number)
      Catch e As FormatException
         Console.WriteLine("Unable to convert '{0}'.", value)
      Catch e As OverflowException
         Console.WriteLine("'{0}' is out of range.", value)      
      End Try
   End Sub
End Module
' This example displays the following output to the console:
'       Converted '  179032  ' to 179032.
'       Converted ' -2041326 ' to -2041326.
'       Converted ' +8091522 ' to 8091522.
'       Unable to convert '   1064.0   '.
'       Unable to convert '  178.3'.
'       Unable to convert ''.
'       '9223372036854775808' is out of range.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.