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Version.TryParse Method

Tries to convert the string representation of a version number to an equivalent Version object, and returns a value that indicates whether the conversion succeeded.

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

'Declaration
Public Shared Function TryParse ( _
	input As String, _
	<OutAttribute> ByRef result As Version _
) As Boolean

Parameters

input
Type: System.String

A string that contains a version number to convert.

result
Type: System.Version

When this method returns, contains the Version equivalent of the number that is contained in input, if the conversion succeeded, or a Version object whose major and minor version numbers are 0 if the conversion failed. If input is Nothing or String.Empty, result is Nothing when the method returns.

Return Value

Type: System.Boolean
true if the input parameter was converted successfully; otherwise, false.

The TryParse method is similar to the Parse method, except that it does not throw an exception if the conversion fails. Instead, it returns false if input is null, has fewer than two or more than four components, has at least one component that is not an integer, has at least one component that is less than zero, or has at least one component that is greater than Int32.MaxValue.

For the parse operation to succeed, the input parameter must be in the following format:

major.minor[.build[.revision]]

where major, minor, build, and revision are the string representations of the version number's four components: major version number, minor version number, build number, and revision number. Optional components are shown in square brackets ([ and ]). The components must appear in order, and must be separated by periods.

The following example uses the TryParse method to parse a number of strings that contain version information.

Module Example
   Public Sub Main()
      Dim input As String = "4.0"
      ParseVersion(input)

      input = "4.0."
      ParseVersion(input)

      input = "1.1.2"
      ParseVersion(input)

      input = "1.1.2.01702"
      ParseVersion(input)

      input = "1.1.2.0702.119"
      ParseVersion(input)

      input =  "1.3.5.2150000000"
      ParseVersion(input)
   End Sub 

   Private Sub ParseVersion(input As String)
      Dim ver As Version = Nothing 
      If Version.TryParse(input, ver) Then
         Console.WriteLine("Converted '{0} to {1}.", input, ver)
      Else
         Console.WriteLine("Unable to determine the version from '{0}'.",
                           input)
      End If 
   End Sub 
End Module 
' The example displays the following output: 
'       Converted '4.0 to 4.0. 
'       Unable to determine the version from '4.0.'. 
'       Converted '1.1.2 to 1.1.2. 
'       Converted '1.1.2.01702 to 1.1.2.1702. 
'       Unable to determine the version from '1.1.2.0702.119'. 
'       Unable to determine the version from '1.3.5.2150000000'.

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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