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File.SetLastWriteTime 方法

定義

多載

SetLastWriteTime(SafeFileHandle, DateTime)

設定上次寫入指定檔案或目錄的日期和時間。

SetLastWriteTime(String, DateTime)

設定指定檔案上次被寫入的日期和時間。

SetLastWriteTime(SafeFileHandle, DateTime)

來源:
File.cs
來源:
File.cs
來源:
File.cs

設定上次寫入指定檔案或目錄的日期和時間。

public:
 static void SetLastWriteTime(Microsoft::Win32::SafeHandles::SafeFileHandle ^ fileHandle, DateTime lastWriteTime);
public static void SetLastWriteTime (Microsoft.Win32.SafeHandles.SafeFileHandle fileHandle, DateTime lastWriteTime);
static member SetLastWriteTime : Microsoft.Win32.SafeHandles.SafeFileHandle * DateTime -> unit
Public Shared Sub SetLastWriteTime (fileHandle As SafeFileHandle, lastWriteTime As DateTime)

參數

fileHandle
SafeFileHandle

SafeFileHandle 設定上次寫入日期與時間資訊的檔案或目錄的 。

lastWriteTime
DateTime

DateTime,包含要為 fileHandle 的上次寫入日期和時間設定的值。 這個值以本地時間表示。

例外狀況

fileHandlenull

lastWriteTime 指定的值超出這項作業允許的日期或時間範圍 (或兩者皆超出)。

呼叫端沒有必要的權限。

執行此作業時發生 I/O 錯誤

適用於

SetLastWriteTime(String, DateTime)

來源:
File.cs
來源:
File.cs
來源:
File.cs

設定指定檔案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

要設定其日期和時間資訊的檔案。

lastWriteTime
DateTime

DateTime,包含要為 path 的上次寫入日期和時間設定的值。 這個值以本地時間表示。

例外狀況

.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。

找不到指定的路徑。

呼叫端沒有必要的權限。

path 格式無效。

lastWriteTime 指定的值超出這項作業允許的日期或時間範圍。

範例

下列範例會檢查文件系統是否有指定的檔案、視需要建立檔案,然後設定並取得檔案的上次寫入時間。

using namespace System;
using namespace System::IO;
int main()
{
   try
   {
      String^ path = "c:\\Temp\\MyTest.txt";
      if (  !File::Exists( path ) )
      {
         File::Create( path );
      }
      else
      {
         
         // Take an action that will affect the write time.
         File::SetLastWriteTime( path, DateTime(1985,4,3) );
      }
      
      // Get the creation time of a well-known directory.
      DateTime dt = File::GetLastWriteTime( path );
      Console::WriteLine( "The last write time for this file was {0}.", dt );
      
      // Update the last write time.
      File::SetLastWriteTime( path, DateTime::Now );
      dt = File::GetLastWriteTime( path );
      Console::WriteLine( "The last write time for this file 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:\Temp\MyTest.txt";
            if (!File.Exists(path))
            {
                File.Create(path);
            }
            else
            {
                // Take an action that will affect the write time.
                File.SetLastWriteTime(path, new DateTime(1985,4,3));
            }

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

try
    let path = @"c:\Temp\MyTest.txt"

    if File.Exists path |> not then
        File.Create path |> ignore
    else
        // Take an action that will affect the write time.
        File.SetLastWriteTime(path, DateTime(1985, 4, 3))

    // Get the creation time of a well-known directory.
    let dt = File.GetLastWriteTime path
    printfn $"The last write time for this file was {dt}."

    // Update the last write time.
    File.SetLastWriteTime(path, DateTime.Now)
    let dt = File.GetLastWriteTime path
    printfn $"The last write time for this file was {dt}."
with
| e -> printfn $"The process failed: {e}"
Imports System.IO
Imports System.Text

Public Class Test
    Public Shared Sub Main()
        Try
            Dim path As String = "c:\Temp\MyTest.txt"

            If File.Exists(path) = False Then
                File.Create(path)
            Else
                ' Take an action that will affect the write time.
                File.SetLastWriteTime(path, New DateTime(1985, 4, 3))
            End If

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

            ' Update the last write time.
            File.SetLastWriteTime(path, DateTime.Now)
            dt = File.GetLastWriteTime(path)
            Console.WriteLine("The last write time for this file 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 參數指定相對路徑或絕對路徑資訊。 相對路徑資訊會解譯為相對於目前的工作目錄。 若要取得目前的工作目錄,請參閱 GetCurrentDirectory

如需一般 I/O 工作的清單,請參閱 一般 I/O 工作

另請參閱

適用於