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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
)

Parameters

path
Type: System.String

The path of a file or directory.

Return Value

Type: System.String
A string that contains the volume information, root information, or both for the specified path.

ExceptionCondition
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. You can query for invalid characters with GetInvalidPathChars.

ArgumentNullException

path is null.

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.

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

The following example illustrates how to set the current directory and display 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

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, 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.

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