Directory.GetLogicalDrives メソッドとは？ わかりやすく解説

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Directory.GetLogicalDrives メソッド

このコンピュータの論理ドライブ名を "<drive letter>:\" の形式で取得します。

名前空間: System.IO
アセンブリ: mscorlib (mscorlib.dll 内)
構文構文

Visual Basic (宣言)
Public Shared Function GetLogicalDrives
 As String()
Visual Basic (使用法)
Dim returnValue As String()

returnValue = Directory.GetLogicalDrives
C#
public static string[] GetLogicalDrives
 ()
C++
public:
static array<String^>^ GetLogicalDrives ()
J#
public static String[] GetLogicalDrives ()
JScript
public static function GetLogicalDrives
 () : String[]

戻り値
このコンピュータの論理ドライブ。

例外例外
例外の種類条件

IOException

ディスク エラーなどの I/O エラーが発生しました。

UnauthorizedAccessException

呼び出し元に、必要なアクセス許可がありません。

解説解説

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。

実行するタスク

参考例があるトピック

ディレクトリの名前を変更、またはディレクトリを移動する。

Directory.Move

DirectoryInfo.MoveTo

ディレクトリを削除する。

Directory.Delete

DirectoryInfo.Delete

ディレクトリを作成する。

CreateDirectory

Directory

サブディレクトリを作成する。

CreateSubdirectory

ディレクトリ内のファイルを参照する。

Name

ディレクトリ内のサブディレクトリを参照する。

GetDirectories

GetDirectories

ディレクトリ内のすべてのサブディレクトリにあるすべてのファイルを参照する。

GetFileSystemInfos

ディレクトリのサイズを取得する。

Directory

ファイルが存在するかどうかを判別する。

Exists

ディレクトリ内のファイルをサイズ順に並べ替える。

GetFileSystemInfos

ディレクトリが存在するかどうかを判別する。

Exists

使用例使用例
Visual Basic
Option Explicit On 
Option Strict On

Imports System

Namespace GetFileSystemEntries
    Class Class1
        Overloads Shared Sub
 Main(ByVal args() As String)
            Dim snippets As New
 Class1()
            Dim path As String
 = System.IO.Directory.GetCurrentDirectory()
            Dim filter As String
 = "*.exe"
            snippets.PrintFileSystemEntries(path)
            snippets.PrintFileSystemEntries(path, filter)
            snippets.GetLogicalDrives()
            snippets.GetParent(path)
            snippets.Move("C:\proof", "C:\Temp")
        End Sub 'Main

        Sub PrintFileSystemEntries(ByVal path
 As String)
            Try
                ' Obtain the file system entries in the directory path.
                Dim directoryEntries As String()
                directoryEntries = System.IO.Directory.GetFileSystemEntries(path)
                Dim str As String
                For Each str In
 directoryEntries
                    System.Console.WriteLine(str)
                Next str
            Catch exp As ArgumentNullException
                System.Console.WriteLine("Path is a null reference.")
            Catch exp As System.Security.SecurityException
                System.Console.WriteLine("The caller does not
 have the " + _
                                        "required permission.")
            Catch exp As ArgumentException
                System.Console.WriteLine("Path is an empty string,
 " + _
                                        "contains only white spaces,
 " + _
                                        "or contains invalid characters.")
            Catch exp As System.IO.DirectoryNotFoundException
                System.Console.WriteLine("The path encapsulated
 in the " + _
                                        "Directory object does
 not exist.")
            End Try
        End Sub
        Sub PrintFileSystemEntries(ByVal path
 As String, _
                                   ByVal pattern As
 String)
            Try
                ' Obtain the file system entries in the directory
                ' path that match the pattern.
                Dim directoryEntries As String()
                directoryEntries = _
                   System.IO.Directory.GetFileSystemEntries(path, pattern)

                Dim str As String
                For Each str In
 directoryEntries
                    System.Console.WriteLine(str)
                Next str
            Catch exp As ArgumentNullException
                System.Console.WriteLine("Path is a null reference.")
            Catch exp As System.Security.SecurityException
                System.Console.WriteLine("The caller does not
 have the " + _
                                        "required permission.")
            Catch exp As ArgumentException
                System.Console.WriteLine("Path is an empty string,
 " + _
                                        "contains only white spaces,
 " + _
                                        "or contains invalid characters.")
            Catch exp As System.IO.DirectoryNotFoundException
                System.Console.WriteLine("The path encapsulated
 in the " + _
                                        "Directory object does
 not exist.")
            End Try
        End Sub

        ' Print out all logical drives on the system.
        Sub GetLogicalDrives()
            Try
                Dim drives As String()
                drives = System.IO.Directory.GetLogicalDrives()

                Dim str As String
                For Each str In
 drives
                    System.Console.WriteLine(str)
                Next str
            Catch exp As System.IO.IOException
                System.Console.WriteLine("An I/O error occurs.")
            Catch exp As System.Security.SecurityException
                System.Console.WriteLine("The caller does not
 have the " + _
                                           "required permission.")
            End Try
        End Sub
        Sub GetParent(ByVal path As
 String)
            Try
                Dim directoryInfo As System.IO.DirectoryInfo
                directoryInfo = System.IO.Directory.GetParent(path)
                System.Console.WriteLine(directoryInfo.FullName)
            Catch exp As ArgumentNullException
                System.Console.WriteLine("Path is a null reference.")
            Catch exp As ArgumentException
                System.Console.WriteLine("Path is an empty string,
 " + _
                                     "contains only white spaces,
 or " + _
                                     "contains invalid characters.")
            End Try
        End Sub
        Sub Move(ByVal sourcePath As
 String, ByVal destinationPath As
 String)
            Try
                System.IO.Directory.Move(sourcePath, destinationPath)
                System.Console.WriteLine("The directory move is
 complete.")
            Catch exp As ArgumentNullException
                System.Console.WriteLine("Path is a null reference.")
            Catch exp As System.Security.SecurityException
                System.Console.WriteLine("The caller does not
 have the " + _
                                           "required permission.")
            Catch exp As ArgumentException
                System.Console.WriteLine("Path is an empty string,
 " + _
                                        "contains only white spaces,
 " + _
                                        "or contains invalid characters.")
            Catch exp As System.IO.IOException
                System.Console.WriteLine("An attempt was made
 to move a " + _
                                        "directory to a different
 " + _
                                        "volume, or destDirName
 " + _
                                        "already exists.")
            End Try
        End Sub
    End Class
End Namespace
C#
using System;

namespace GetFileSystemEntries
{
    class Class1 
    {
        static void Main(string[]
 args) 
        {
            Class1 snippets = new Class1();

            string path = System.IO.Directory.GetCurrentDirectory();
            string filter = "*.exe";

            snippets.PrintFileSystemEntries(path);
            snippets.PrintFileSystemEntries(path, filter);        
            snippets.GetLogicalDrives();
            snippets.GetParent(path);
            snippets.Move("C:\\proof", "C:\\Temp");
        }

        
        void PrintFileSystemEntries(string
 path) 
        {
            
            try 
            {
                // Obtain the file system entries in the directory path.
                string[] directoryEntries =
                    System.IO.Directory.GetFileSystemEntries(path); 

                foreach (string str in
 directoryEntries) 
                {
                    System.Console.WriteLine(str);
                }
            }
            catch (ArgumentNullException) 
            {
                System.Console.WriteLine("Path is a null
 reference.");
            }
            catch (System.Security.SecurityException) 
            {
                System.Console.WriteLine("The caller does not have the "
 +
                    "required permission.");
            }
            catch (ArgumentException) 
            {
                System.Console.WriteLine("Path is an empty string,
 " +
                    "contains only white spaces, " + 
                    "or contains invalid characters.");
            }
            catch (System.IO.DirectoryNotFoundException) 
            {
                System.Console.WriteLine("The path encapsulated in
 the " + 
                    "Directory object does not exist.");
            }
        }
        void PrintFileSystemEntries(string
 path, string pattern) 
        {
            try 
            {
                // Obtain the file system entries in the directory
                // path that match the pattern.
                string[] directoryEntries =
                    System.IO.Directory.GetFileSystemEntries(path, pattern); 

                foreach (string str in
 directoryEntries) 
                {
                    System.Console.WriteLine(str);
                }
            }
            catch (ArgumentNullException) 
            {
                System.Console.WriteLine("Path is a null
 reference.");
            }
            catch (System.Security.SecurityException) 
            {
                System.Console.WriteLine("The caller does not have the "
 +
                    "required permission.");
            }
            catch (ArgumentException) 
            {
                System.Console.WriteLine("Path is an empty string,
 " +
                    "contains only white spaces, " + 
                    "or contains invalid characters.");
            }
            catch (System.IO.DirectoryNotFoundException) 
            {
                System.Console.WriteLine("The path encapsulated in
 the " + 
                    "Directory object does not exist.");
            }
        }

        // Print out all logical drives on the system.
        void GetLogicalDrives() 
        {
            try 
            {
                string[] drives = System.IO.Directory.GetLogicalDrives();

                foreach (string str in
 drives) 
                {
                    System.Console.WriteLine(str);
                }
            }
            catch (System.IO.IOException) 
            {
                System.Console.WriteLine("An I/O error occurs.");
            }
            catch (System.Security.SecurityException) 
            {
                System.Console.WriteLine("The caller does not have the "
 +
                    "required permission.");
            }
        }
        void GetParent(string path) 
        {
            try 
            {
                System.IO.DirectoryInfo directoryInfo =
                    System.IO.Directory.GetParent(path);

                System.Console.WriteLine(directoryInfo.FullName);
            }
            catch (ArgumentNullException) 
            {
                System.Console.WriteLine("Path is a null
 reference.");
            }
            catch (ArgumentException) 
            {
                System.Console.WriteLine("Path is an empty string,
 " +
                    "contains only white spaces, or " +
                    "contains invalid characters.");
            }
        }
        void Move(string sourcePath, string
 destinationPath) 
        {
            try 
            {
                System.IO.Directory.Move(sourcePath, destinationPath);
                System.Console.WriteLine("The directory move is complete.");
            }
            catch (ArgumentNullException) 
            {
                System.Console.WriteLine("Path is a null
 reference.");
            }
            catch (System.Security.SecurityException) 
            {
                System.Console.WriteLine("The caller does not have the "
 +
                    "required permission.");
            }
            catch (ArgumentException) 
            {
                System.Console.WriteLine("Path is an empty string,
 " +
                    "contains only white spaces, " + 
                    "or contains invalid characters.");    
            }
            catch (System.IO.IOException) 
            {
                System.Console.WriteLine("An attempt was made to move a "
 +
                    "directory to a different " +
                    "volume, or destDirName " +
                    "already exists."); 
            }
        }
    }
}
C++
using namespace System;
class Class1
{
public:
   void PrintFileSystemEntries( String^ path )
   {
      try
      {
         
         // Obtain the file system entries in the directory path.
         array<String^>^directoryEntries = System::IO::Directory::GetFileSystemEntries(
 path );
         for ( int i = 0; i < directoryEntries->Length;
 i++ )
         {
            System::Console::WriteLine( directoryEntries[ i ] );

         }
      }
      catch ( ArgumentNullException^ ) 
      {
         System::Console::WriteLine(  "Path is a null reference."
 );
      }
      catch ( System::Security::SecurityException^ ) 
      {
         System::Console::WriteLine(  "The caller does not have the \HelloServer'
                  required permission." );
      }
      catch ( ArgumentException^ ) 
      {
         System::Console::WriteLine(  "Path is an empty String, \HelloServer'
                  contains only white spaces, \HelloServer'                  or
 contains invalid characters." );
      }
      catch ( System::IO::DirectoryNotFoundException^ ) 
      {
         System::Console::WriteLine(  "The path encapsulated in
 the \HelloServer'                  Directory object does not exist." );
      }

   }

   void PrintFileSystemEntries( String^ path, String^ pattern
 )
   {
      try
      {
         
         // Obtain the file system entries in the directory
         // path that match the pattern.
         array<String^>^directoryEntries = System::IO::Directory::GetFileSystemEntries(
 path, pattern );
         for ( int i = 0; i < directoryEntries->Length;
 i++ )
         {
            System::Console::WriteLine( directoryEntries[ i ] );

         }
      }
      catch ( ArgumentNullException^ ) 
      {
         System::Console::WriteLine(  "Path is a null reference."
 );
      }
      catch ( System::Security::SecurityException^ ) 
      {
         System::Console::WriteLine(  "The caller does not have the \HelloServer'
                  required permission." );
      }
      catch ( ArgumentException^ ) 
      {
         System::Console::WriteLine(  "Path is an empty String, \HelloServer'
                  contains only white spaces, \HelloServer'                  or
 contains invalid characters." );
      }
      catch ( System::IO::DirectoryNotFoundException^ ) 
      {
         System::Console::WriteLine(  "The path encapsulated in
 the \HelloServer'                  Directory object does not exist." );
      }

   }


   // Print out all logical drives on the system.
   void GetLogicalDrives()
   {
      try
      {
         array<String^>^drives = System::IO::Directory::GetLogicalDrives();
         for ( int i = 0; i < drives->Length;
 i++ )
         {
            System::Console::WriteLine( drives[ i ] );

         }
      }
      catch ( System::IO::IOException^ ) 
      {
         System::Console::WriteLine(  "An I/O error occurs." );
      }
      catch ( System::Security::SecurityException^ ) 
      {
         System::Console::WriteLine(  "The caller does not have the \HelloServer'
                  required permission." );
      }

   }

   void GetParent( String^ path )
   {
      try
      {
         System::IO::DirectoryInfo^ directoryInfo = System::IO::Directory::GetParent(
 path );
         System::Console::WriteLine( directoryInfo->FullName );
      }
      catch ( ArgumentNullException^ ) 
      {
         System::Console::WriteLine(  "Path is a null reference."
 );
      }
      catch ( ArgumentException^ ) 
      {
         System::Console::WriteLine(  "Path is an empty String, \HelloServer'
                  contains only white spaces, or \HelloServer'                 
 contains invalid characters." );
      }

   }

   void Move( String^ sourcePath, String^ destinationPath )
   {
      try
      {
         System::IO::Directory::Move( sourcePath, destinationPath );
         System::Console::WriteLine(  "The directory move is complete."
 );
      }
      catch ( ArgumentNullException^ ) 
      {
         System::Console::WriteLine(  "Path is a null reference."
 );
      }
      catch ( System::Security::SecurityException^ ) 
      {
         System::Console::WriteLine(  "The caller does not have the \HelloServer'
                  required permission." );
      }
      catch ( ArgumentException^ ) 
      {
         System::Console::WriteLine(  "Path is an empty String, \HelloServer'
                  contains only white spaces, \HelloServer'                  or
 contains invalid characters." );
      }
      catch ( System::IO::IOException^ ) 
      {
         System::Console::WriteLine(  "An attempt was made to move a \HelloServer'
                  directory to a different \HelloServer'                  volume,
 or destDirName \HelloServer'                  already exists." );
      }

   }

};

int main()
{
   Class1 * snippets = new Class1;
   String^ path = System::IO::Directory::GetCurrentDirectory();
   String^ filter =  "*.exe";
   snippets->PrintFileSystemEntries( path );
   snippets->PrintFileSystemEntries( path, filter );
   snippets->GetLogicalDrives();
   snippets->GetParent( path );
   snippets->Move(  "C:\\proof",  "C:\\Temp" );
   return 0;
}
J#
package GetFileSystemEntries ;
import System.*;

class Class1
{
    public static void main(String[]
 args)
    {
        Class1 snippets = new Class1();

        String path = System.IO.Directory.GetCurrentDirectory();
        String filter = "*.exe";

        snippets.PrintFileSystemEntries(path);
        snippets.PrintFileSystemEntries(path, filter);
        snippets.GetLogicalDrives();
        snippets.GetParent(path);
        snippets.Move("C:\\proof", "C:\\Temp");
    } //main

    void PrintFileSystemEntries(String path)
    {
        try {
            // Obtain the file system entries in the directory path.
            String directoryEntries[] = 
                System.IO.Directory.GetFileSystemEntries(path);

            for (int iCtr = 0; iCtr < directoryEntries.length;
 iCtr++) {
                String str = directoryEntries[iCtr];
                System.Console.WriteLine(str);
            }
        }
        catch (ArgumentNullException exp) {
            System.Console.WriteLine("Path is a null reference.");
        }
        catch (System.Security.SecurityException exp) {
            System.Console.WriteLine(("The caller does not have the "
                + "required permission."));
        }
        catch (ArgumentException exp) {
            System.Console.WriteLine(("Path is an empty string,
 "
                + "contains only white spaces, "
                + "or contains invalid characters."));
        }
        catch (System.IO.DirectoryNotFoundException exp) {
            System.Console.WriteLine(("The path encapsulated in
 the "
                + "Directory object does not exist."));
        }
    } //PrintFileSystemEntries

    void PrintFileSystemEntries(String path, String pattern)
    {
        try {
            // Obtain the file system entries in the directory
            // path that match the pattern.
            String directoryEntries[] = 
                System.IO.Directory.GetFileSystemEntries(path, pattern);

            for (int iCtr = 0; iCtr < directoryEntries.length;
 iCtr++) {
                String str = directoryEntries[iCtr];
                System.Console.WriteLine(str);
            }
        }
        catch (ArgumentNullException exp) {
            System.Console.WriteLine("Path is a null reference.");
        }
        catch (System.Security.SecurityException exp) {
            System.Console.WriteLine(("The caller does not have the "
                + "required permission."));
        }
        catch (ArgumentException exp) {
            System.Console.WriteLine(("Path is an empty string,
 "
                + "contains only white spaces, "
                + "or contains invalid characters."));
        }
        catch (System.IO.DirectoryNotFoundException exp) {
            System.Console.WriteLine(("The path encapsulated in
 the "
                + "Directory object does not exist."));
        }
    } //PrintFileSystemEntries

    // Print out all logical drives on the system.
    void GetLogicalDrives()
    {
        try {
            String drives[] = System.IO.Directory.GetLogicalDrives();

            for (int iCtr = 0; iCtr < drives.length;
 iCtr++) {
                String str = drives[iCtr];
                System.Console.WriteLine(str);
            }
        }
        catch (System.IO.IOException exp) {
            System.Console.WriteLine("An I/O error occurs.");
        }
        catch (System.Security.SecurityException exp) {
            System.Console.WriteLine(("The caller does not have the "
                + "required permission."));
        }
    } //GetLogicalDrives

    void GetParent(String path)
    {
        try {
            System.IO.DirectoryInfo directoryInfo = 
                System.IO.Directory.GetParent(path);
            System.Console.WriteLine(directoryInfo.get_FullName());
        }
        catch (ArgumentNullException exp) {
            System.Console.WriteLine("Path is a null reference.");
        }
        catch (ArgumentException exp) {
            System.Console.WriteLine(("Path is an empty string,
 "
                +"contains only white spaces, or contains invalid characters."));
        }
    } //GetParent

    void Move(String sourcePath, String destinationPath)
    {
        try {
            System.IO.Directory.Move(sourcePath, destinationPath);
            System.Console.WriteLine("The directory move is complete.");
        }
        catch (ArgumentNullException exp) {
            System.Console.WriteLine("Path is a null reference.");
        }
        catch (System.Security.SecurityException exp) {
            System.Console.WriteLine(("The caller does not have the "
                + "required permission."));
        }
        catch (ArgumentException exp) {
            System.Console.WriteLine(("Path is an empty string,
 "
                +"contains only white spaces, or contains invalid characters."));
        }
        catch (System.IO.IOException exp) {
            System.Console.WriteLine(("An attempt was made to move a "
                + "directory to a different "
                + "volume, or destDirName "
                + "already exists."));
        }
    } //Move
} //Class1
.NET Framework のセキュリティ.NET Framework のセキュリティ
プラットフォームプラットフォーム

Windows 98, Windows 2000 SP4, Windows Millennium Edition, 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。

バージョン情報バージョン情報
.NET Framework
サポート対象 : 2.0、1.1、1.0
参照参照
関連項目
Directory クラス
Directory メンバ
System.IO 名前空間
その他の技術情報
ファイルおよびストリーム入出力
方法 : ファイルからテキストを読み取る
方法 : ファイルにテキストを書き込む

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「Directory.GetLogicalDrives メソッド」の関連用語

1
Directory.Move メソッド
.NET Framework クラス ライブラリ リファレンス
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Directory.GetLogicalDrives メソッドのお隣キーワード

Directory.GetFileSystemEntries メソッド

Directory.GetFiles メソッド

Directory.GetLastAccessTime メソッド

Directory.GetLastAccessTimeUtc メソッド

Directory.GetLastWriteTime メソッド

Directory.GetLastWriteTimeUtc メソッド

Directory.GetLogicalDrives メソッド

Directory.GetParent メソッド

DirectoryException コンストラクタ

DirectoryException プロパティ

DirectoryException メソッド

DirectoryException メンバ

DirectoryIdentifier クラス

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