Directory.SetCurrentDirectory(String) 方法

定義

命名空間:

System.IO

組件:

System.Runtime.dll

來源:

Directory.cs

將應用程式的目前工作目錄設定為指定目錄。

public:
 static void SetCurrentDirectory(System::String ^ path);

public static void SetCurrentDirectory (string path);

static member SetCurrentDirectory : string -> unit

Public Shared Sub SetCurrentDirectory (path As String)

參數

path

String

設定為目前工作目錄的路徑。

例外狀況

IOException

發生 I/O 錯誤。

ArgumentException

.NET Framework 和 2.1 之前的 .NET Core 版本：path是長度為零的字串、只包含空格符，或包含一或多個無效字元。 您可以使用 GetInvalidPathChars() 方法查詢無效字元。

ArgumentNullException

path 為 null。

PathTooLongException

指定的路徑、檔案名稱，或兩者都超出系統定義的長度上限。

SecurityException

呼叫端沒有必要的權限。

FileNotFoundException

找不到指定的路徑。

DirectoryNotFoundException

找不到指定目錄。

範例

下列範例說明如何設定當前目錄並顯示目錄根目錄。

// This sample shows how to set the current directory and how to determine
// the root directory.
using namespace System;
using namespace System::IO;
int main()
{
   
   // Create string for a directory. This value should be an existing directory
   // or the sample will throw a DirectoryNotFoundException.
   String^ dir = "C:\\test";
   try
   {
      
      //Set the current directory.
      Directory::SetCurrentDirectory( dir );
   }
   catch ( DirectoryNotFoundException^ e ) 
   {
      Console::WriteLine( "The specified directory does not exist. {0}", e );
   }

   
   // Print to console the results.
   Console::WriteLine( "Root directory: {0}", Directory::GetDirectoryRoot( dir ) );
   Console::WriteLine( "Current directory: {0}", Directory::GetCurrentDirectory() );
}

// The output of this sample depends on what value you assign to the variable dir.
// If the directory c:\test exists, the output for this sample is:
// Root directory: C:\
// Current directory: C:\test

// This sample shows how to set the current directory and how to determine
// the root directory.
using System;
using System.IO;

namespace IOSamples
{
  public class DirectoryRoot
  {
    public static void Main()
    {
    // Create string for a directory. This value should be an existing directory
    // or the sample will throw a DirectoryNotFoundException.
      string dir = @"C:\test";		
      try
      {
          //Set the current directory.
          Directory.SetCurrentDirectory(dir);
      }
      catch (DirectoryNotFoundException e)
      {
          Console.WriteLine("The specified directory does not exist. {0}", e);
      }
    // Print to console the results.
      Console.WriteLine("Root directory: {0}", Directory.GetDirectoryRoot(dir));
      Console.WriteLine("Current directory: {0}", Directory.GetCurrentDirectory());
    }
  }
}
// The output of this sample depends on what value you assign to the variable dir.
// If the directory c:\test exists, the output for this sample is:
// Root directory: C:\
// Current directory: C:\test

// This sample shows how to set the current directory and how to determine
// the root directory.
open System.IO

// Create string for a directory. This value should be an existing directory
// or the sample will throw a DirectoryNotFoundException.
let dir = @"C:\test"
try
    //Set the current directory.
    Directory.SetCurrentDirectory dir
with :? DirectoryNotFoundException as e ->
    printfn $"The specified directory does not exist. {e}"
    
// Print to console the results.
printfn $"Root directory: {Directory.GetDirectoryRoot dir}"
printfn $"Current directory: {Directory.GetCurrentDirectory()}"
// The output of this sample depends on what value you assign to the variable dir.
// If the directory c:\test exists, the output for this sample is:
// Root directory: C:\
// Current directory: C:\test

' This sample shows how to set the current directory and how to determine
' the root directory.
Imports System.IO

Public Class DirectoryRoot
   
   Public Shared Sub Main()
      ' Create string for a directory. This value should be an existing directory
      ' or the sample will throw a DirectoryNotFoundException.
      Dim dir As String = "C:\test"
      Try
         'Set the current directory.
         Directory.SetCurrentDirectory(dir)
      Catch e As DirectoryNotFoundException
         Console.WriteLine("The specified directory does not exist. {0}", e)
      End Try
      ' Print to console the results.
      Console.WriteLine("Root directory: {0}", Directory.GetDirectoryRoot(dir))
      Console.WriteLine("Current directory: {0}", Directory.GetCurrentDirectory())
   End Sub
End Class
' The output of this sample depends on what value you assign to the variable dir.
' If the directory c:\test exists, the output for this sample is:
' Root directory: C:\
' Current directory: C:\test

備註

當應用程式終止時，工作目錄會還原到其原始位置， (進程啟動所在的目錄) 。

允許 path 參數指定相對或絕對路徑資訊。 相對路徑資訊會解譯為相對於目前工作目錄。 若要取得目前的工作目錄，請參閱 GetCurrentDirectory。

在設定目錄之前，會從參數結尾移除尾端 path 空格。

參數的 path 區分大小寫會對應至程式代碼執行所在的文件系統。 例如，在NTFS上不區分大小寫 (預設Windows檔案系統) 和Linux檔案系統上區分大小寫。

如果您要將目錄設定為具有卸載式媒體 (的磁碟驅動器，例如 USB 快閃磁碟驅動器的 “E：”) ，您可以使用 屬性來判斷磁碟驅動器是否已就緒 IsReady 。

另請參閱

• FileSystemWatcher
• 檔案和資料流 I/O
• 作法：讀取檔案中的文字
• 作法：將文字寫入檔案