Path.GetExtension Method
Assembly: mscorlib (in mscorlib.dll)
public static String GetExtension ( String path )
public static function GetExtension ( path : String ) : String
Parameters
- path
The path string from which to get the extension.
Return Value
A String containing the extension of the specified path (including the "."), a null reference (Nothing in Visual Basic), or Empty. If path is a null reference (Nothing in Visual Basic), GetExtension returns a null reference (Nothing in Visual Basic). If path does not have extension information, GetExtension returns Empty.| Exception type | Condition |
|---|---|
| path contains one or more of the invalid characters defined in InvalidPathChars, or contains a wildcard character. |
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 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. | |
| Write to a text file. | |
| Read from a text file. | |
| Retrieve the fully qualified path of a file. | |
| Retrieve the file name and extension from a path. | |
| Retrieve only the file name from a path. | |
| Change the extension of a file. |
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 );
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);
var fileName : String = "C:\\mydir.old\\myfile.ext"; var path : String = "C:\\mydir.old\\"; var extension : String; extension = Path.GetExtension(fileName); Console.WriteLine("GetExtension('{0}') returns '{1}'", fileName, extension); extension = Path.GetExtension(path); Console.WriteLine("GetExtension('{0}') returns '{1}'", path, extension);
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.