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Path.GetPathRoot Method (String)


Gets the root directory information of the specified path.

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

public static string GetPathRoot(
	string path


Type: System.String

The path from which to obtain root directory information.

Return Value

Type: System.String

The root directory of path, such as "C:\", or null if path is null, or an empty string if path does not contain root directory information.

Exception Condition

path contains one or more of the invalid characters defined in GetInvalidPathChars.


String.Empty was passed to path.

This method does not verify that the path or file name exists.

Possible patterns for the string returned by this method are as follows:

  • An empty string (path specified a relative path on the current drive or volume).

  • "/" (path specified an absolute path on the current drive).

  • "X:" (path specified a relative path on a drive, where X represents a drive or volume letter).

  • "X:/" (path specified an absolute path on a given drive).

  • "\\ComputerName\SharedFolder" (a UNC path).

The .NET Framework does not support direct access to physical disks through paths that are device names, such as "\\.\PHYSICALDRIVE0 ".

For a list of common I/O tasks, see Common I/O Tasks.

The following code example demonstrates a use of the GetPathRoot method.

string path = @"\mydir\";
string fileName = "myfile.ext";
string fullPath = @"C:\mydir\myfile.ext";
string pathRoot;

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

pathRoot = Path.GetPathRoot(fileName);
Console.WriteLine("GetPathRoot('{0}') returns '{1}'", 
    fileName, pathRoot);

pathRoot = Path.GetPathRoot(fullPath);
Console.WriteLine("GetPathRoot('{0}') returns '{1}'", 
    fullPath, pathRoot);

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

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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