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Directory.EnumerateDirectories Method (String)

Returns an enumerable collection of directory names in a specified path.

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

public static IEnumerable<string> EnumerateDirectories(
	string path
)

Parameters

path
Type: System.String

The relative or absolute path to the directory to search. This string is not case-sensitive.

Return Value

Type: System.Collections.Generic.IEnumerable<String>
An enumerable collection of the full names (including paths) for the directories in the directory specified by path.

ExceptionCondition
ArgumentException

path is a zero-length string, contains only white space, or contains invalid characters. You can query for invalid characters by using the GetInvalidPathChars method.

ArgumentNullException

path is null.

DirectoryNotFoundException

path is invalid, such as referring to an unmapped drive.

IOException

path is a file name.

PathTooLongException

The specified path, file name, or combined 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.

SecurityException

The caller does not have the required permission.

UnauthorizedAccessException

The caller does not have the required permission.

You can specify relative or absolute path information in the path parameter. Relative path information is interpreted as relative to the current working directory, which you can determine by using the GetCurrentDirectory method. The returned directory names are prefixed with the value you provided in the path parameter. For example, if you provide a relative path in the path parameter, the returned directory names will contain a relative path.

The EnumerateDirectories and GetDirectories methods differ as follows: When you use EnumerateDirectories, you can start enumerating the collection of names before the whole collection is returned; when you use GetDirectories, you must wait for the whole array of names to be returned before you can access the array. Therefore, when you are working with many files and directories, EnumerateDirectories can be more efficient.

The returned collection is not cached; each call to the GetEnumerator on the collection will start a new enumeration.

The following example enumerates the top-level directories in a specified path.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

class Program
{
    private static void Main(string[] args)
    {
        try
        {
            string dirPath = @"\\archives\2009\reports";

            List<string> dirs = new List<string>(Directory.EnumerateDirectories(dirPath));

            foreach (var dir in dirs)
            {
                Console.WriteLine("{0}", dir.Substring(dir.LastIndexOf("\\") + 1));
            }
            Console.WriteLine("{0} directories found.",  dirs.Count);
        }
        catch (UnauthorizedAccessException UAEx)
        {
            Console.WriteLine(UAEx.Message);
        }
        catch (PathTooLongException PathEx)
        {
            Console.WriteLine(PathEx.Message);
        }
    }
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4

.NET Framework Client Profile

Supported in: 4

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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