Path.HasExtension Method
Determines whether a path includes a file name extension.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- path
- Type: System.String
The path to search for an extension.
Return Value
Type: System.Booleantrue 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 | Condition |
|---|---|
| ArgumentException |
path contains one or more of the invalid characters defined in GetInvalidPathChars. |
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 a list of common I/O tasks, see Common I/O Tasks.
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
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
