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Path::GetExtension Method

Returns the extension of the specified path string.

Namespace:  System.IO
Assemblies:   mscorlib (in mscorlib.dll)
  System.Runtime.Extensions (in System.Runtime.Extensions.dll)

static String^ GetExtension(
	String^ 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 nullptr, or String::Empty. If path is nullptr, GetExtension returns nullptr. If path does not have extension information, GetExtension returns String::Empty.


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.

String^ fileName = "C:\\mydir.old\\myfile.ext";
String^ path = "C:\\mydir.old\\";
String^ extension;
extension = Path::GetExtension( fileName );
Console::WriteLine( "GetExtension('{0}') returns '{1}'", fileName, extension );
extension = Path::GetExtension( path );
Console::WriteLine( "GetExtension('{0}') returns '{1}'", path, 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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
© 2015 Microsoft