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Directory.GetDirectoryRoot Method

Returns the volume information, root information, or both for the specified path.

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

public static string GetDirectoryRoot (
	string path
)
public static String GetDirectoryRoot (
	String path
)
public static function GetDirectoryRoot (
	path : String
) : String

Parameters

path

The path of a file or directory.

Return Value

A string containing the volume information, root information, or both for the specified path.

Exception typeCondition

UnauthorizedAccessException

The caller does not have the required permission.

ArgumentException

path is a zero-length string, contains only white space, or contains one or more invalid characters as defined by InvalidPathChars.

ArgumentNullException

path is a null reference (Nothing in Visual Basic).

PathTooLongException

The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters and file names must be less than 260 characters.

This method obtains the fully qualified path name of path, as returned by GetFullPath, and returns root directory information. The specified path is not required to exist.

The path parameter is permitted to specify relative or absolute path information. Relative path information is interpreted as relative to the current working directory. To obtain the current working directory, see GetCurrentDirectory.

The path parameter is not case-sensitive.

The following table lists examples of other typical or related I/O tasks.

To do this...

See the example in this topic...

Rename or move a directory.

Directory.Move

DirectoryInfo.MoveTo

See the files in a directory.

Name

See the subdirectories of a directory.

GetDirectories

GetDirectories

See all the files in all subdirectories of a directory.

GetFileSystemInfos

Find the size of a directory.

Directory

Determine if a file exists.

Exists

Determine if a directory exists.

Exists

Retrieve only the directory name.

GetDirectoryName

Retrieve the fully qualified path of a file.

GetFullPath

Sort files in a directory by size.

GetFileSystemInfos

The following code example illustrates setting the current directory and displaying the directory root.

// This sample shows how to set the current directory and how to determine
// the root directory.
using System;
using System.IO;

namespace IOSamples
{
  public class DirectoryRoot
  {
    public static void Main()
    {
	// Create string for a directory. This value should be an existing directory
	// or the sample will throw a DirectoryNotFoundException.
      string dir = @"C:\test";		
	  try
	  {
		  //Set the current directory.
		  Directory.SetCurrentDirectory(dir);
	  }
	  catch (DirectoryNotFoundException e)
	  {
		  Console.WriteLine("The specified directory does not exist. {0}", e);
	  }
	// Print to console the results.
	  Console.WriteLine("Root directory: {0}", Directory.GetDirectoryRoot(dir));
	  Console.WriteLine("Current directory: {0}", Directory.GetCurrentDirectory());
    }
  }
}
// The output of this sample depends on what value you assign to the variable dir.
// If the directory c:\test exists, the output for this sample is:
// Root directory: C:\
// Current directory: C:\test


// This sample shows how to set the current directory and how to determine
// the root directory.

import System.*;
import System.IO.*;

public class DirectoryRoot
{
    public static void main(String[] args)
    {
        // Create string for a directory. This value should be an existing 
        // directory or the sample will throw a DirectoryNotFoundException.
        String dir = "C:\\test";
        try {
            //Set the current directory.
            Directory.SetCurrentDirectory(dir);
        }
        catch (DirectoryNotFoundException e) {
            Console.WriteLine("The specified directory does not exist. {0}", e);
        }
        // Print to console the results.
        Console.WriteLine("Root directory: {0}",
            Directory.GetDirectoryRoot(dir));
        Console.WriteLine("Current directory: {0}",
            Directory.GetCurrentDirectory());
    } //main
} //DirectoryRoot
// The output of this sample depends on what value you assign to the 
// variable dir.
// If the directory c:\test exists, the output for this sample is:
// Root directory: C:\
// Current directory: C:\test

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.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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