Path.GetExtension Method
Returns the extension of the specified path string.
Namespace: System.IO
Assembly: mscorlib (in mscorlib.dll)
Parameters
- path
- Type: System.String
The path string from which to get the extension.
Return Value
Type: System.StringThe extension of the specified path (including the period "."), or null, or String.Empty. If path is null, GetExtension returns null. If path does not have extension information, GetExtension returns String.Empty.
| Exception | Condition |
|---|---|
| ArgumentException | path contains one or more of the invalid characters defined in GetInvalidPathChars. |
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 a list of common I/O tasks, see Common I/O Tasks.
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); // This code produces output similar to the following: // // GetExtension('C:\mydir.old\myfile.ext') returns '.ext' // GetExtension('C:\mydir.old\') returns ''
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
