Directory.Exists メソッド
アセンブリ: mscorlib (mscorlib.dll 内)
構文
Dim path As String Dim returnValue As Boolean returnValue = Directory.Exists(path)
戻り値
path が既存のディレクトリを参照している場合は true。それ以外の場合は false。
path パラメータは、相対パス情報または絶対パス情報を指定することを許可されています。相対パス情報は、現在の作業ディレクトリに対して相対的に解釈されます。
ディレクトリが存在するかどうかを確認する前に、path パラメータの末尾から末尾の空白が削除されます。
Exists メソッドは、ネットワーク認証を実行しません。事前に認証を行わずに既存のネットワーク共有を照会すると、Exists メソッドが false を返します。
その他の一般的な I/O タスクまたは関連する I/O タスクの例を次の表に示します。
Directory.Move DirectoryInfo.MoveTo | |
Directory.Delete DirectoryInfo.Delete | |
CreateDirectory | |
CreateSubdirectory | |
GetDirectories GetDirectories | |
GetFileSystemInfos | |
GetFileSystemInfos |
ファイル名またはディレクトリ名の配列をコマンド ラインから受け取り、名前の種類を判断し、適切な処理を行うコード例を次に示します。
' For File.Exists, Directory.Exists Imports System Imports System.IO Imports System.Collections Public Class RecursiveFileProcessor Public Overloads Shared Sub Main(ByVal args() As String) Dim path As String For Each path In args If File.Exists(path) Then ' This path is a file. ProcessFile(path) Else If Directory.Exists(path) Then ' This path is a directory. ProcessDirectory(path) Else Console.WriteLine("{0} is not a valid file or directory.", path) End If End If Next path End Sub 'Main ' Process all files in the directory passed in, recurse on any directories ' that are found, and process the files they contain. Public Shared Sub ProcessDirectory(ByVal targetDirectory As String) Dim fileEntries As String() = Directory.GetFiles(targetDirectory) ' Process the list of files found in the directory. Dim fileName As String For Each fileName In fileEntries ProcessFile(fileName) Next fileName Dim subdirectoryEntries As String() = Directory.GetDirectories(targetDirectory) ' Recurse into subdirectories of this directory. Dim subdirectory As String For Each subdirectory In subdirectoryEntries ProcessDirectory(subdirectory) Next subdirectory End Sub 'ProcessDirectory ' Insert logic for processing found files here. Public Shared Sub ProcessFile(ByVal path As String) Console.WriteLine("Processed file '{0}'.", path) End Sub 'ProcessFile End Class 'RecursiveFileProcessor
// For File.Exists, Directory.Exists using System; using System.IO; using System.Collections; public class RecursiveFileProcessor { public static void Main(string[] args) { foreach(string path in args) { if(File.Exists(path)) { // This path is a file ProcessFile(path); } else if(Directory.Exists(path)) { // This path is a directory ProcessDirectory(path); } else { Console.WriteLine("{0} is not a valid file or directory.", path); } } } // Process all files in the directory passed in, recurse on any directories // that are found, and process the files they contain. public static void ProcessDirectory(string targetDirectory) { // Process the list of files found in the directory. string [] fileEntries = Directory.GetFiles(targetDirectory); foreach(string fileName in fileEntries) ProcessFile(fileName); // Recurse into subdirectories of this directory. string [] subdirectoryEntries = Directory.GetDirectories(targetDirectory); foreach(string subdirectory in subdirectoryEntries) ProcessDirectory(subdirectory); } // Insert logic for processing found files here. public static void ProcessFile(string path) { Console.WriteLine("Processed file '{0}'.", path); } }
// For File::Exists, Directory::Exists using namespace System; using namespace System::IO; using namespace System::Collections; // Insert logic for processing found files here. void ProcessFile( String^ path ) { Console::WriteLine( "Processed file '{0}'.", path ); } // Process all files in the directory passed in, recurse on any directories // that are found, and process the files they contain. void ProcessDirectory( String^ targetDirectory ) { // Process the list of files found in the directory. array<String^>^fileEntries = Directory::GetFiles( targetDirectory ); IEnumerator^ files = fileEntries->GetEnumerator(); while ( files->MoveNext() ) { String^ fileName = safe_cast<String^>(files->Current); ProcessFile( fileName ); } // Recurse into subdirectories of this directory. array<String^>^subdirectoryEntries = Directory::GetDirectories( targetDirectory ); IEnumerator^ dirs = subdirectoryEntries->GetEnumerator(); while ( dirs->MoveNext() ) { String^ subdirectory = safe_cast<String^>(dirs->Current); ProcessDirectory( subdirectory ); } } int main( int argc, char *argv[] ) { for ( int i = 1; i < argc; i++ ) { String^ path = gcnew String(argv[ i ]); if ( File::Exists( path ) ) { // This path is a file ProcessFile( path ); } else if ( Directory::Exists( path ) ) { // This path is a directory ProcessDirectory( path ); } else { Console::WriteLine( "{0} is not a valid file or directory.", path ); } } }
// For File.Exists, Directory.Exists import System.*; import System.IO.*; import System.Collections.*; public class RecursiveFileProcessor { public static void main(String[] args) { for (int iCtr = 0; iCtr < args.get_Length(); iCtr++) { String path = args[iCtr]; if (File.Exists(path)) { // This path is a file ProcessFile(path); } else { if (Directory.Exists(path)) { // This path is a directory ProcessDirectory(path); } else { Console.WriteLine("{0} is not a valid file or directory." , path); } } } } //main // Process all files in the directory passed in, recurse on any directories // that are found, and process the files they contain. public static void ProcessDirectory(String targetDirectory) { // Process the list of files found in the directory. String fileEntries[] = Directory.GetFiles(targetDirectory); for (int iCtr1 = 0; iCtr1 < fileEntries.get_Length(); iCtr1++) { String fileName = fileEntries[iCtr1]; ProcessFile(fileName); } // Recurse into subdirectories of this directory. String subDirectoryEntries[] = Directory.GetDirectories(targetDirectory); for (int iCtr2 = 0; iCtr2 < subDirectoryEntries.get_Length(); iCtr2++) { String subDirectory = subDirectoryEntries[iCtr2]; ProcessDirectory(subDirectory); } } //ProcessDirectory // Insert logic for processing found files here. public static void ProcessFile(String path) { Console.WriteLine("Processed file '{0}'.", path); } //ProcessFile } //RecursiveFileProcessor
//For Directory.GetFiles and Directory.GetDirectories import System; import System.IO; import System.Collections; // For File.Exists, Directory.Exists // Takes an array of file names or directory names on the command line. // Determines what kind of name it is and processes it appropriately public class RecursiveFileProcessor { public static function Main(args : String[]) : void { for(var i : int in args) { var path : String = args[i]; if (File.Exists(path)) { // This path is a file ProcessFile(path); } else if(Directory.Exists(path)) { // This path is a directory ProcessDirectory(path); } else { Console.WriteLine("{0} is not a valid file or directory.", path); } } } // Process all files in the directory passed in, and recurse on any directories // that are found to process the files they contain public static function ProcessDirectory(targetDirectory : String) : void { // Process the list of files found in the directory var fileEntries : String [] = Directory.GetFiles(targetDirectory); for (var i : int in fileEntries) ProcessFile(fileEntries[i]); // Recurse into subdirectories of this directory var subdirectoryEntries : String[] = Directory.GetDirectories(targetDirectory); for (i in subdirectoryEntries) ProcessDirectory(subdirectoryEntries[i]); } // Real logic for processing found files would go here. public static function ProcessFile(path : String) : void { Console.WriteLine("Processed file '{0}'.", path); } } // For JScript there is no 'Main' routine defined and hence the command line arguments // have to be obtained with a call to System.Environment.GetCommandLineArgs RecursiveFileProcessor.Main(System.Environment.GetCommandLineArgs());
プラットフォーム
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
開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。
参照
- Directory.Exists メソッドのページへのリンク