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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

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.

How to: Write Text to a File

Write to a text file.

How to: Write Text to a File

Read from a text file.

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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