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Path.GetExtension Method

Returns the extension of the specified path string.

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

public static string GetExtension(
	string path
)

Parameters

path
Type: System.String

The path string from which to get the extension.

Return Value

Type: System.String
A String containing the extension of the specified path (including the "."), null, or Empty. If path is null, GetExtension returns null. If path does not have extension information, GetExtension returns 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.

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 ''

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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