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Directory.SetLastWriteTime(String, DateTime) 方法

定義

設定目錄上次被寫入的日期和時間。

public:
 static void SetLastWriteTime(System::String ^ path, DateTime lastWriteTime);
public static void SetLastWriteTime (string path, DateTime lastWriteTime);
static member SetLastWriteTime : string * DateTime -> unit
Public Shared Sub SetLastWriteTime (path As String, lastWriteTime As DateTime)

參數

path
String

目錄的路徑。

lastWriteTime
DateTime

目錄上次被寫入的日期和時間。 這個值以本地時間表示。

例外狀況

找到 path (例如,該目錄不存在或其位於未對應的磁碟機上)。

找到 path (例如,該目錄不存在或其位於未對應的磁碟機上)。

.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。

pathnull

指定的路徑、檔案名稱,或兩者都超出系統定義的長度上限。

呼叫端沒有必要的權限。

目前的作業系統不是 Windows NT 或更新版本。

lastWriteTime 指定的值超出這項作業允許的日期或時間範圍。

範例

下列範例示範如何使用 SetLastWriteTime

using namespace System;
using namespace System::IO;
void main()
{
   try
   {
      String^ path = "c:\\MyDir";
      if (  !Directory::Exists( path ) )
      {
         Directory::CreateDirectory( path );
      }
      else
      {
         
         // Take an action that will affect the write time.
         Directory::SetLastWriteTime( path, DateTime(1985,4,3) );
      }
      
      // Get the last write time of a well-known directory.
      DateTime dt = Directory::GetLastWriteTime( path );
      Console::WriteLine( "The last write time for this directory was {0}", dt );
      
      //Update the last write time.
      Directory::SetLastWriteTime( path, DateTime::Now );
      dt = Directory::GetLastWriteTime( path );
      Console::WriteLine( "The last write time for this directory was {0}", dt );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "The process failed: {0}", e );
   }

}
using System;
using System.IO;

class Test
{
    public static void Main()
    {
        try
        {
            string path = @"c:\MyDir";
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }
            else
            {
                // Take an action that will affect the write time.
                Directory.SetLastWriteTime(path, new DateTime(1985,4,3));
            }

            // Get the last write time of a well-known directory.
            DateTime dt = Directory.GetLastWriteTime(path);
            Console.WriteLine("The last write time for this directory was {0}", dt);
            
            //Update the last write time.
            Directory.SetLastWriteTime(path, DateTime.Now);
            dt = Directory.GetLastWriteTime(path);
            Console.WriteLine("The last write time for this directory was {0}", dt);
        }
        catch (Exception e)
        {
            Console.WriteLine("The process failed: {0}", e.ToString());
        }
    }
}
open System
open System.IO

try
    let path = @"c:\MyDir"
    if not (Directory.Exists path) then
        Directory.CreateDirectory path |> ignore

    else
        // Take an action that will affect the write time.
        Directory.SetLastWriteTime(path, DateTime(1985, 4, 3))

    // Get the last write time of a well-known directory.
    let dt = Directory.GetLastWriteTime path
    printfn $"The last write time for this directory was {dt}"
    
    //Update the last write time.
    Directory.SetLastWriteTime(path, DateTime.Now)
    let dt = Directory.GetLastWriteTime path
    printfn $"The last write time for this directory was {dt}"
with e ->
    printfn $"The process failed: {e}"
Imports System.IO

Public Class Test
    Public Shared Sub Main()
        Try
            Dim path As String = "c:\MyDir"
            If Directory.Exists(path) = False Then
                Directory.CreateDirectory(path)
            Else
                ' Take an action that will affect the write time.
                Directory.SetLastWriteTime(path, New DateTime(1985, 4, 3))
            End If

            'Get the last write time of a well-known directory.
            Dim dt As DateTime = Directory.GetLastWriteTime(path)
            Console.WriteLine("The last write time for this directory was {0}", dt)

            'Update the last write time.
            Directory.SetLastWriteTime(path, DateTime.Now)
            dt = Directory.GetLastWriteTime(path)
            Console.WriteLine("The last write time for this directory was {0}", dt)

        Catch e As Exception
            Console.WriteLine("The process failed: {0}", e.ToString())
        End Try
    End Sub
End Class

備註

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

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。

如需一般 I/O 工作的清單,請參閱 一般 I/O 工作

適用於

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