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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 Value

Type: System.String
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

.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
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