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Path.GetPathRoot Method

Gets the root directory information of the specified path.

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

public static string GetPathRoot(
	string path
)

Parameters

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.

ExceptionCondition
ArgumentException

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

-or-

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:\'


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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.

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