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Path.GetExtension Method

Returns the extension of the specified path string.

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

'Declaration
Public Shared Function GetExtension ( _
	path As String _
) As String

Parameters

path
Type: System.String

The path string from which to get the extension.

Return Value

Type: System.String
The extension of the specified path (including the period "."), or Nothing, or String.Empty. If path is Nothing, GetExtension returns Nothing. If path does not have extension information, GetExtension returns String.Empty.

ExceptionCondition
ArgumentException

path contains one or more of the invalid characters defined in GetInvalidPathChars.

The extension of path is obtained by searching path for a period (.), starting with the last character in path and continuing toward the start of path. If a period is found before a DirectorySeparatorChar or AltDirectorySeparatorChar character, the returned string contains the period and the characters after it; otherwise, Empty is returned.

For a list of common I/O tasks, see Common I/O Tasks.

The following code example demonstrates using the GetExtension method on a Windows-based desktop platform.

Dim fileName As String = "C:\mydir.old\myfile.ext" 
Dim pathname As String = "C:\mydir.old\" 
Dim extension As String

extension = Path.GetExtension(fileName)
Console.WriteLine("GetExtension('{0}') returns '{1}'", fileName, extension)

extension = Path.GetExtension(pathname)
Console.WriteLine("GetExtension('{0}') returns '{1}'", pathname, extension)

' This code produces output similar to the following: 

' GetExtension('C:\mydir.old\myfile.ext') returns '.ext' 
' GetExtension('C:\mydir.old\') returns ''

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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