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FileSystemInfo.Extension Property

Gets the string representing the extension part of the file.

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

public string Extension { get; }
/** @property */
public String get_Extension ()

public function get Extension () : String

Not applicable.

Property Value

A string containing the FileSystemInfo extension.

The Extension property returns the FileSystemInfo extension, including the period (.). For example, for a file c:\NewFile.txt, this property returns ".txt".

The following table lists examples of other typical or related I/O tasks.

To do this...

See the example in this topic...

Create a text file.

Writing Text to a File

Write to a text file.

Writing Text to a File

Read from a text file.

Reading Text from a File

Retrieve the fully qualified path of a file.

GetFullPath

Retrieve only the file name a path.

GetFileNameWithoutExtension

Retrieve only the directory name from a path.

GetDirectoryName

Change the extension of a file.

ChangeExtension

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0
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