File.SetLastAccessTime 方法

定义

重载

SetLastAccessTime(String, DateTime)

设置上次访问指定文件的日期和时间。

SetLastAccessTime(SafeFileHandle, DateTime)

设置上次访问指定文件或目录的日期和时间。

SetLastAccessTime(String, DateTime)

Source:
File.cs
Source:
File.cs
Source:
File.cs

设置上次访问指定文件的日期和时间。

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

参数

path
String

要为其设置访问日期和时间信息的文件。

lastAccessTime
DateTime

一个 DateTime,包含为 path的最后一个访问日期和时间设置的值。 此值以本地时间表示。

例外

低于 2.1 的 .NET Framework 和 .NET Core 版本:path 为零长度的字符串,仅包含空格,或包含一个或多个无效字符。 可以使用 GetInvalidPathChars() 方法查询无效字符。

path null

指定的路径、文件名或两者都超过了系统定义的最大长度。

找不到指定的路径。

调用方没有所需的权限。

path 格式无效。

lastAccessTime 指定超出此操作允许的日期或时间范围的值。

示例

以下示例检查文件系统中的指定文件、根据需要创建该文件,然后设置并获取上次访问时间。

using namespace System;
using namespace System::IO;
int main()
{
   try
   {
      String^ path = "c:\\Temp\\MyTest.txt";
      if (  !File::Exists( path ) )
      {
         File::Create( path );
         
         // Update the last access time.    
      }
      File::SetLastAccessTime( path, DateTime(1985,5,4) );
      
      // Get the creation time of a well-known directory.
      DateTime dt = File::GetLastAccessTime( path );
      Console::WriteLine( "The last access time for this file was {0}.", dt );
      
      // Update the last access time.
      File::SetLastAccessTime( path, DateTime::Now );
      dt = File::GetLastAccessTime( path );
      Console::WriteLine( "The last access 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);
                // Update the last access time.	
            }
            File.SetLastAccessTime(path, new DateTime(1985,5,4));

            // Get the creation time of a well-known directory.
            DateTime dt = File.GetLastAccessTime(path);
            Console.WriteLine("The last access time for this file was {0}.", dt);
            
            // Update the last access time.
            File.SetLastAccessTime(path, DateTime.Now);
            dt = File.GetLastAccessTime(path);
            Console.WriteLine("The last access 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

    // Update the last access time.
    File.SetLastAccessTime(path, DateTime(1985, 5, 4))

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

    // Update the last access time.
    File.SetLastAccessTime(path, DateTime.Now)
    let dt = File.GetLastAccessTime path
    printfn $"The last access 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)
            End If
            File.SetLastAccessTime(path, New DateTime(1985, 5, 4))

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

            ' Update the last access time.
            File.SetLastAccessTime(path, DateTime.Now)
            dt = File.GetLastAccessTime(path)
            Console.WriteLine("The last access 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

注解

允许 path 参数指定相对路径或绝对路径信息。 相对路径信息解释为相对于当前工作目录。 若要获取当前工作目录,请参阅 GetCurrentDirectory

有关常见 I/O 任务的列表,请参阅 常见 I/O 任务

另请参阅

适用于

SetLastAccessTime(SafeFileHandle, DateTime)

Source:
File.cs
Source:
File.cs
Source:
File.cs

设置上次访问指定文件或目录的日期和时间。

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

参数

fileHandle
SafeFileHandle

要为其设置上次访问日期和时间信息的文件或目录的 SafeFileHandle

lastAccessTime
DateTime

一个 DateTime,包含为 fileHandle的最后一个访问日期和时间设置的值。 此值以本地时间表示。

例外

fileHandle null

lastAccessTime 指定超出此操作允许的日期、时间或两者范围之外的值。

调用方没有所需的权限。

执行操作时发生 I/O 错误。

适用于