Directory.EnumerateDirectories Method

Source:

Directory.cs

Source:

Directory.cs

Source:

Directory.cs

public:
 static System::Collections::Generic::IEnumerable<System::String ^> ^ EnumerateDirectories(System::String ^ path);

public static System.Collections.Generic.IEnumerable<string> EnumerateDirectories (string path);

static member EnumerateDirectories : string -> seq<string>

Public Shared Function EnumerateDirectories (path As String) As IEnumerable(Of String)

Parameters

Returns

An enumerable collection of the full names (including paths) for the directories in the directory specified by path.

Exceptions

Examples

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

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

class Program
{
    private static void Main(string[] args)
    {
        try
        {
            // Set a variable to the My Documents path.
            string docPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

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

            foreach (var dir in dirs)
            {
                Console.WriteLine($"{dir.Substring(dir.LastIndexOf(Path.DirectorySeparatorChar) + 1)}");
            }
            Console.WriteLine($"{dirs.Count} directories found.");
        }
        catch (UnauthorizedAccessException ex)
        {
            Console.WriteLine(ex.Message);
        }
        catch (PathTooLongException ex)
        {
            Console.WriteLine(ex.Message);
        }
    }
}

open System
open System.IO

try
    // Set a variable to the My Documents path.
    let docPath = Environment.GetFolderPath Environment.SpecialFolder.MyDocuments

    let dirs = Directory.EnumerateDirectories docPath |> Seq.toList

    for dir in dirs do
        printfn $"{dir.Substring(dir.LastIndexOf Path.DirectorySeparatorChar + 1)}"
    printfn $"{dirs.Length} directories found."

with
| :? UnauthorizedAccessException as ex ->
    printfn $"{ex.Message}"
| :? PathTooLongException as ex ->
    printfn $"{ex.Message}"

Imports System.Collections.Generic
Imports System.IO

Module Module1

    Sub Main()
        Try
            Dim dirPath As String = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)

            Dim dirs As List(Of String) = New List(Of String)(Directory.EnumerateDirectories(dirPath))

            For Each folder In dirs
                Console.WriteLine($"{dir.Substring(dir.LastIndexOf(Path.DirectorySeparatorChar) + 1)}")
            Next
            Console.WriteLine($"{dirs.Count} directories found.")
        Catch ex As UnauthorizedAccessException
            Console.WriteLine(ex.Message)
        Catch ex As PathTooLongException
            Console.WriteLine(ex.Message)
        End Try

    End Sub
End Module

Remarks

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.

Source:

Directory.cs

Source:

Directory.cs

Source:

Directory.cs

public:
 static System::Collections::Generic::IEnumerable<System::String ^> ^ EnumerateDirectories(System::String ^ path, System::String ^ searchPattern);

public static System.Collections.Generic.IEnumerable<string> EnumerateDirectories (string path, string searchPattern);

static member EnumerateDirectories : string * string -> seq<string>

Public Shared Function EnumerateDirectories (path As String, searchPattern As String) As IEnumerable(Of String)

Parameters

Returns

An enumerable collection of the full names (including paths) for the directories in the directory specified by path and that match the specified search pattern.

Exceptions

Examples

The following example enumerates the top-level directories in a specified path that match a specified search pattern.

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";

            // LINQ query.
            var dirs = from dir in
                     Directory.EnumerateDirectories(dirPath, "dv_*")
                       select dir;

            // Show results.
            foreach (var dir in dirs)
            {
                // Remove path information from string.
                Console.WriteLine("{0}",
                    dir.Substring(dir.LastIndexOf("\\") + 1));
            }
            Console.WriteLine("{0} directories found.",
                dirs.Count<string>().ToString());

            // Optionally create a List collection.
            List<string> workDirs = new List<string>(dirs);
        }
        catch (UnauthorizedAccessException UAEx)
        {
            Console.WriteLine(UAEx.Message);
        }
        catch (PathTooLongException PathEx)
        {
            Console.WriteLine(PathEx.Message);
        }
    }
}

open System
open System.IO

try
    let dirPath = @"\\archives\2009\reports"

    let dirs = 
        Directory.EnumerateDirectories(dirPath, "dv_*")
        |> Seq.cache

    // Show results.
    for dir in dirs do
        // Remove path information from string.
        printfn $"{dir.Substring(dir.LastIndexOf '\\' + 1)}"
    printfn $"{Seq.length dirs} directories found."

    // Optionally create a list collection.
    let workDirs = Seq.toList dirs
    ()
    
with 
| :? UnauthorizedAccessException as uaEx ->
    printfn $"{uaEx.Message}"
| :? PathTooLongException as pathEx ->
    printfn $"{pathEx.Message}"

Imports System.Collections.Generic
Imports System.IO
Imports System.Linq

Module Module1

    Sub Main()
        Try
            Dim dirPath As String = "\\archives\2009\reports"

            ' LINQ query.
            Dim dirs = From folder In _
                Directory.EnumerateDirectories(dirPath, "dv_*")
            For Each folder In dirs
                ' Remove path infomration from string.
                Console.WriteLine("{0}", _
                        folder.Substring(folder.LastIndexOf("\") + 1))
            Next
            Console.WriteLine("{0} directories found.", _
                dirs.Count.ToString())

            ' Optionally create a List collection.
            Dim workDirs As List(Of String) = New List(Of String)

        Catch UAEx As UnauthorizedAccessException
            Console.WriteLine(UAEx.Message)
        Catch PathEx As PathTooLongException
            Console.WriteLine(PathEx.Message)
        End Try
    End Sub
End Module

Remarks

searchPattern can be a combination of literal and wildcard characters, but it doesn't support regular expressions. The following wildcard specifiers are permitted in searchPattern.

Characters other than the wildcard are literal characters. For example, the searchPattern string "*t" searches for all names in path ending with the letter "t". The searchPattern string "s*" searches for all names in path beginning with the letter "s".

searchPattern cannot end in two periods ("..") or contain two periods ("..") followed by DirectorySeparatorChar or AltDirectorySeparatorChar, nor can it contain any invalid characters. You can query for invalid characters by using the GetInvalidPathChars method.

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.

Source:

Directory.cs

Source:

Directory.cs

Source:

Directory.cs

public:
 static System::Collections::Generic::IEnumerable<System::String ^> ^ EnumerateDirectories(System::String ^ path, System::String ^ searchPattern, System::IO::EnumerationOptions ^ enumerationOptions);

public static System.Collections.Generic.IEnumerable<string> EnumerateDirectories (string path, string searchPattern, System.IO.EnumerationOptions enumerationOptions);

static member EnumerateDirectories : string * string * System.IO.EnumerationOptions -> seq<string>

Public Shared Function EnumerateDirectories (path As String, searchPattern As String, enumerationOptions As EnumerationOptions) As IEnumerable(Of String)

Parameters

Returns

An enumerable collection of the full names (including paths) for the directories in the directory specified by path and that match the specified search pattern and enumeration options.

Exceptions

Remarks

searchPattern can be a combination of literal and wildcard characters, but it doesn't support regular expressions. The following wildcard specifiers are permitted in searchPattern.

Characters other than the wildcard are literal characters. For example, the searchPattern string "*t" searches for all names in path ending with the letter "t". The searchPattern string "s*" searches for all names in path beginning with the letter "s".

searchPattern cannot end in two periods ("..") or contain two periods ("..") followed by DirectorySeparatorChar or AltDirectorySeparatorChar, nor can it contain any invalid characters. You can query for invalid characters by using the GetInvalidPathChars method.

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.

Source:

Directory.cs

Source:

Directory.cs

Source:

Directory.cs

public:
 static System::Collections::Generic::IEnumerable<System::String ^> ^ EnumerateDirectories(System::String ^ path, System::String ^ searchPattern, System::IO::SearchOption searchOption);

public static System.Collections.Generic.IEnumerable<string> EnumerateDirectories (string path, string searchPattern, System.IO.SearchOption searchOption);

static member EnumerateDirectories : string * string * System.IO.SearchOption -> seq<string>

Public Shared Function EnumerateDirectories (path As String, searchPattern As String, searchOption As SearchOption) As IEnumerable(Of String)

Parameters

Returns

An enumerable collection of the full names (including paths) for the directories in the directory specified by path and that match the specified search pattern and search option.

Exceptions

Examples

The following example enumerates directories in a specified path that match a specified search pattern. It uses the searchOption parameter to specify that all subdirectories should be included in the search.

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";

            // LINQ query.
            var dirs = from dir in
                     Directory.EnumerateDirectories(dirPath, "dv_*",
                        SearchOption.AllDirectories)
                       select dir;

            // Show results.
            foreach (var dir in dirs)
            {
                // Remove path information from string.
                Console.WriteLine("{0}",
                    dir.Substring(dir.LastIndexOf("\\") + 1));
            }
            Console.WriteLine("{0} directories found.",
                dirs.Count<string>().ToString());

            // Optionally create a List collection.
            List<string> workDirs = new List<string>(dirs);
        }
        catch (UnauthorizedAccessException UAEx)
        {
            Console.WriteLine(UAEx.Message);
        }
        catch (PathTooLongException PathEx)
        {
            Console.WriteLine(PathEx.Message);
        }
    }
}

open System
open System.IO

try
    let dirPath = @"\\archives\2009\reports"

    let dirs =
        Directory.EnumerateDirectories(dirPath, "dv_*", SearchOption.AllDirectories)
        |> Seq.cache

    // Show results.
    for dir in dirs do
        // Remove path information from string.
        printfn $"{dir.Substring(dir.LastIndexOf '\\' + 1)}"
    printfn $"{Seq.length dirs} directories found."

    // Optionally create a List collection.
    let workDirs = Seq.toList dirs
    ()

with 
| :? UnauthorizedAccessException as uaEx ->
    printfn $"{uaEx.Message}"
| :? PathTooLongException as pathEx ->
    printfn $"{pathEx.Message}"

Imports System.Collections.Generic
Imports System.IO
Imports System.Linq

Module Module1

    Sub Main()
        Try
            Dim dirPath As String = "\\archives\2009\reports"

            ' LINQ query.
            Dim dirs = From folder In _
                Directory.EnumerateDirectories(dirPath, "dv_*", _
                    SearchOption.AllDirectories)
            For Each folder In dirs
                ' Remove path infomration from string.
                Console.WriteLine("{0}", _
                        folder.Substring(folder.LastIndexOf("\") + 1))
            Next
            Console.WriteLine("{0} directories found.", _
                dirs.Count.ToString())

            ' Optionally create a List collection.
            Dim workDirs As List(Of String) = New List(Of String)

        Catch UAEx As UnauthorizedAccessException
            Console.WriteLine(UAEx.Message)
        Catch PathEx As PathTooLongException
            Console.WriteLine(PathEx.Message)
        End Try
    End Sub
End Module

Remarks

searchPattern can be a combination of literal and wildcard characters, but it doesn't support regular expressions. The following wildcard specifiers are permitted in searchPattern.

Characters other than the wildcard are literal characters. For example, the searchPattern string "*t" searches for all names in path ending with the letter "t". The searchPattern string "s*" searches for all names in path beginning with the letter "s".

searchPattern cannot end in two periods ("..") or contain two periods ("..") followed by DirectorySeparatorChar or AltDirectorySeparatorChar, nor can it contain any invalid characters. You can query for invalid characters by using the GetInvalidPathChars method.

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.