Directory.EnumerateFiles Method

Source:

Directory.cs

Source:

Directory.cs

Source:

Directory.cs

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

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

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

Public Shared Function EnumerateFiles (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 files in the directory specified by path and that match the specified search pattern and search option.

Exceptions

Examples

The following example shows how to retrieve all the text files in a directory and its subdirectories, and move them to a new directory. After the files are moved, they no longer exist in the original directories.

using System;
using System.IO;

namespace ConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            string sourceDirectory = @"C:\current";
            string archiveDirectory = @"C:\archive";

            try
            {
                var txtFiles = Directory.EnumerateFiles(sourceDirectory, "*.txt", SearchOption.AllDirectories);

                foreach (string currentFile in txtFiles)
                {
                    string fileName = currentFile.Substring(sourceDirectory.Length + 1);
                    Directory.Move(currentFile, Path.Combine(archiveDirectory, fileName));
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }
    }
}

open System.IO

let sourceDirectory = @"C:\current"
let archiveDirectory = @"C:\archive"

try
    let txtFiles = Directory.EnumerateFiles(sourceDirectory, "*.txt", SearchOption.AllDirectories)

    for currentFile in txtFiles do
        let fileName = currentFile.Substring(sourceDirectory.Length + 1)
        Directory.Move(currentFile, Path.Combine(archiveDirectory, fileName))
with e ->
    printfn $"{e.Message}"

Imports System.IO

Module Module1

    Sub Main()
        Dim sourceDirectory As String = "C:\current"
        Dim archiveDirectory As String = "C:\archive"

        Try
            Dim txtFiles = Directory.EnumerateFiles(sourceDirectory, "*.txt", SearchOption.AllDirectories)

            For Each currentFile As String In txtFiles
                Dim fileName = currentFile.Substring(sourceDirectory.Length + 1)
                Directory.Move(currentFile, Path.Combine(archiveDirectory, fileName))
            Next
        Catch e As Exception
            Console.WriteLine(e.Message)
        End Try

    End Sub

End Module

The following example recursively enumerates all files that have the extension .txt, reads each line of the file, and displays the line if it contains the string "Microsoft".

using System;
using System.IO;
using System.Linq;

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

            var files = from file in Directory.EnumerateFiles(docPath, "*.txt", SearchOption.AllDirectories)
                        from line in File.ReadLines(file)
                        where line.Contains("Microsoft")
                        select new
                        {
                            File = file,
                            Line = line
                        };

            foreach (var f in files)
            {
                Console.WriteLine($"{f.File}\t{f.Line}");
            }
            Console.WriteLine($"{files.Count().ToString()} files found.");
        }
        catch (UnauthorizedAccessException uAEx)
        {
            Console.WriteLine(uAEx.Message);
        }
        catch (PathTooLongException pathEx)
        {
            Console.WriteLine(pathEx.Message);
        }
    }
}

open System
open System.IO

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

    let files =
        query {
            for file in Directory.EnumerateFiles(docPath, "*.txt", SearchOption.AllDirectories) do
            for line in File.ReadLines file do
            where (line.Contains "Microsoft")
            select {| File = file; Line = line |}
        }

    for f in files do
        printfn $"{f.File}\t{f.Line}"
    printfn $"{Seq.length files} files found."

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

Imports System.IO
Imports System.Xml.Linq

Module Module1

    Sub Main()
        Try
            Dim docPath As String = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
            Dim files = From chkFile In Directory.EnumerateFiles(docPath, "*.txt", SearchOption.AllDirectories)
                        From line In File.ReadLines(chkFile)
                        Where line.Contains("Microsoft")
                        Select New With {.curFile = chkFile, .curLine = line}

            For Each f In files
                Console.WriteLine($"{f.File}\t{f.Line}")
            Next
            Console.WriteLine($"{files.Count} files found.")
        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 path information with 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 EnumerateFiles and GetFiles methods differ as follows: When you use EnumerateFiles, you can start enumerating the collection of names before the whole collection is returned. When you use GetFiles, 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, EnumerateFiles can be more efficient.

The returned collection is not cached. Each call to the GetEnumerator on the collection starts a new enumeration.

Source:

Directory.cs

Source:

Directory.cs

Source:

Directory.cs

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

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

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

Public Shared Function EnumerateFiles (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 files 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 path information with 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 EnumerateFiles and GetFiles methods differ as follows: When you use EnumerateFiles, you can start enumerating the collection of names before the whole collection is returned. When you use GetFiles, 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, EnumerateFiles can be more efficient.

The returned collection is not cached. Each call to the GetEnumerator on the collection starts a new enumeration.

Source:

Directory.cs

Source:

Directory.cs

Source:

Directory.cs

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

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

static member EnumerateFiles : string -> seq<string>

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

Parameters

Returns

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

Exceptions

Examples

The following example shows how to retrieve all the files in a directory and move them to a new directory. After the files are moved, they no longer exist in the original directory.

using System;
using System.IO;

namespace ConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            string sourceDirectory = @"C:\current";
            string archiveDirectory = @"C:\archive";

            try
            {
                var txtFiles = Directory.EnumerateFiles(sourceDirectory);

                foreach (string currentFile in txtFiles)
                {
                    string fileName = currentFile.Substring(sourceDirectory.Length + 1);
                    Directory.Move(currentFile, Path.Combine(archiveDirectory, fileName));
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }
    }
}

open System.IO

let sourceDirectory = @"C:\current"
let archiveDirectory = @"C:\archive"

try
    let txtFiles = Directory.EnumerateFiles sourceDirectory

    for currentFile in txtFiles do
        let fileName = currentFile.Substring(sourceDirectory.Length + 1)
        Directory.Move(currentFile, Path.Combine(archiveDirectory, fileName))
with e ->
    printfn $"{e.Message}"

Imports System.IO

Module Module1

    Sub Main()
        Dim sourceDirectory As String = "C:\current"
        Dim archiveDirectory As String = "C:\archive"

        Try
            Dim txtFiles = Directory.EnumerateFiles(sourceDirectory)

            For Each currentFile As String In txtFiles
                Dim fileName = currentFile.Substring(sourceDirectory.Length + 1)
                Directory.Move(currentFile, Path.Combine(archiveDirectory, fileName))
            Next
        Catch e As Exception
            Console.WriteLine(e.Message)
        End Try

    End Sub

End Module

The following example enumerates the files in the specified directory, reads each line of the file, and displays the line if it contains the string "Europe".

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

class Program
{
    static void Main(string[] args)
    {
        try
        {
            // LINQ query for all files containing the word 'Europe'.
            var files = from file in
                Directory.EnumerateFiles(@"\\archives1\library\")
                where file.ToLower().Contains("europe")
                select file;

            foreach (var file in files)
            {
                Console.WriteLine("{0}", file);
            }
            Console.WriteLine("{0} files found.", files.Count<string>().ToString());
        }
        catch (UnauthorizedAccessException UAEx)
        {
            Console.WriteLine(UAEx.Message);
        }
        catch (PathTooLongException PathEx)
        {
            Console.WriteLine(PathEx.Message);
        }
    }
}

open System
open System.IO

try
    // All files containing the word 'Europe'.
    let files =
        Directory.EnumerateFiles @"\\archives1\library\"
        |> Seq.filter (fun file -> file.ToLower().Contains "europe")

    for file in files do
        printfn $"{file}"
    printfn $"{Seq.length files} files found."

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

Imports System.IO
Imports System.Linq

Module Module1

    Sub Main()
        Try
            ' LINQ query for all files containing the word 'Europe'.
            Dim files = From file In Directory.EnumerateFiles("\\archives1\library\")
                Where file.ToLower().Contains("europe")

            For Each file In files
                Console.WriteLine("{0}", file)
            Next
            Console.WriteLine("{0} files found.", files.Count.ToString())
        Catch UAEx As UnauthorizedAccessException
            Console.WriteLine(UAEx.Message)
        Catch PathEx As PathTooLongException
            Console.WriteLine(PathEx.Message)
        End Try
    End Sub

End Module

Remarks

You can specify relative path information with 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 EnumerateFiles and GetFiles methods differ as follows: When you use EnumerateFiles, you can start enumerating the collection of names before the whole collection is returned. When you use GetFiles, 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, EnumerateFiles 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 ^> ^ EnumerateFiles(System::String ^ path, System::String ^ searchPattern);

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

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

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

Parameters

Returns

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

Exceptions

Examples

The following example shows how to retrieve all the text files in a directory and move them to a new directory. After the files are moved, they no longer exist in the original directory.

using System;
using System.IO;

namespace ConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            string sourceDirectory = @"C:\current";
            string archiveDirectory = @"C:\archive";

            try
            {
                var txtFiles = Directory.EnumerateFiles(sourceDirectory, "*.txt");

                foreach (string currentFile in txtFiles)
                {
                    string fileName = currentFile.Substring(sourceDirectory.Length + 1);
                    Directory.Move(currentFile, Path.Combine(archiveDirectory, fileName));
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }
    }
}

open System.IO

let sourceDirectory = @"C:\current"
let archiveDirectory = @"C:\archive"

try
    let txtFiles = Directory.EnumerateFiles(sourceDirectory, "*.txt")

    for currentFile in txtFiles do
        let fileName = currentFile.Substring(sourceDirectory.Length + 1)
        Directory.Move(currentFile, Path.Combine(archiveDirectory, fileName))

with e ->
    printfn $"{e.Message}"

Imports System.IO

Module Module1

    Sub Main()
        Dim sourceDirectory As String = "C:\current"
        Dim archiveDirectory As String = "C:\archive"

        Try
            Dim txtFiles = Directory.EnumerateFiles(sourceDirectory, "*.txt")

            For Each currentFile As String In txtFiles
                Dim fileName = currentFile.Substring(sourceDirectory.Length + 1)
                Directory.Move(currentFile, Path.Combine(archiveDirectory, fileName))
            Next
        Catch e As Exception
            Console.WriteLine(e.Message)
        End Try
    End Sub

End Module

The following example enumerates the files in the specified directory that have a ".txt" extension, reads each line of the file, and displays the line if it contains the string "Europe".

using System;
using System.Linq;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        try
        {
            // LINQ query for all .txt files containing the word 'Europe'.
            var files = from file in Directory.EnumerateFiles(@"\\archives1\library\", "*.txt")
                where file.ToLower().Contains("europe")
                select file;

            foreach (var file in files)
            {
                Console.WriteLine("{0}", file);
            }
            Console.WriteLine("{0} files found.", files.Count<string>().ToString());
        }
            
        catch (UnauthorizedAccessException UAEx)
        {
            Console.WriteLine(UAEx.Message);
        }
        catch (PathTooLongException PathEx)
        {
            Console.WriteLine(PathEx.Message);
        }
    }
}

open System
open System.IO

try
    // All .txt files containing the word 'Europe'.
    let files = 
        Directory.EnumerateFiles(@"\\archives1\library\", "*.txt")
        |> Seq.filter(fun file -> file.ToLower().Contains "europe")

    for file in files do
        printfn $"{file}"
    printfn $"{Seq.length files} files found."

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

Imports System.IO
Imports System.Linq

Module Module1

    Sub Main()
        Try
            ' LINQ query for all .txt files containing the word 'Europe'.
            Dim files = From file In Directory.EnumerateFiles("\\archives1\library\", "*.txt")
                Where file.ToLower().Contains("europe")

            For Each file In files
                Console.WriteLine("{0}", file)
            Next
            Console.WriteLine("{0} files found.", files.Count.ToString())
        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 path information with 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 EnumerateFiles and GetFiles methods differ as follows: When you use EnumerateFiles, you can start enumerating the collection of names before the whole collection is returned; when you use GetFiles, 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, EnumerateFiles can be more efficient.

The returned collection is not cached. Each call to the GetEnumerator on the collection starts a new enumeration.