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Path.HasExtension Method

Determines whether a path includes a file name extension.

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

public static bool HasExtension (
	string path
)
public static boolean HasExtension (
	String path
)
public static function HasExtension (
	path : String
) : boolean

Parameters

path

The path to search for an extension.

Return Value

true if the characters that follow the last directory separator (\\ or /) or volume separator (:) in the path include a period (.) followed by one or more characters; otherwise, false.

Exception typeCondition

ArgumentException

path contains one or more of the invalid characters defined in InvalidPathChars, or contains a wildcard character.

Starting from the end of path, this method searches for a period (.) followed by at least one character. If this pattern is found before a DirectorySeparatorChar, AltDirectorySeparatorChar, or VolumeSeparatorChar character is encountered, this method returns true.

For an example of using this method, see the Example section below. 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 a file extension.

GetExtension

Retrieve the fully qualified path of a file.

GetFullPath

Retrieve the file name and extension from a path.

GetFileName

Retrieve only the file name from a path.

GetFileNameWithoutExtension

Retrieve only the directory name from a path.

GetDirectoryName

Change the extension of a file.

ChangeExtension

Determine if a directory exists.

Exists

Determine if a file exists.

Exists

The following code example demonstrates the use of the HasExtension method.

string fileName1 = "myfile.ext";
string fileName2 = @"mydir\myfile";
string path = @"C:\mydir.ext\";
bool result;

result = Path.HasExtension(fileName1);
Console.WriteLine("HasExtension('{0}') returns {1}", 
    fileName1, result);

result = Path.HasExtension(fileName2);
Console.WriteLine("HasExtension('{0}') returns {1}", 
    fileName2, result);

result = Path.HasExtension(path);
Console.WriteLine("HasExtension('{0}') returns {1}", 
    path, result);

// This code produces output similar to the following:
//
// HasExtension('myfile.ext') returns True
// HasExtension('mydir\myfile') returns False
// HasExtension('C:\mydir.ext\') returns False

String fileName1 = "myfile.ext";
String fileName2 = "mydir\\myfile";
String path = "C:\\mydir.ext\\";
boolean result;

result = Path.HasExtension(fileName1);
Console.WriteLine("HasExtension('{0}') returns {1}", 
    fileName1,System.Convert.ToString(result));

result = Path.HasExtension(fileName2);
Console.WriteLine("HasExtension('{0}') returns {1}", 
    fileName2, System.Convert.ToString(result));

result = Path.HasExtension(path);
Console.WriteLine("HasExtension('{0}') returns {1}", 
    path, System.Convert.ToString(result));

var fileName1 : String = "myfile.ext";
var fileName2 : String  = "mydir\\myfile";
var path : String = "C:\\mydir.ext\\";
var result : boolean;

result = Path.HasExtension(fileName1);
Console.WriteLine("HasExtension('{0}') returns {1}", 
                  fileName1, result);

result = Path.HasExtension(fileName2);
Console.WriteLine("HasExtension('{0}') returns {1}", 
                  fileName2, result);

result = Path.HasExtension(path);
Console.WriteLine("HasExtension('{0}') returns {1}", 
                  path, result);

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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