File.SetLastAccessTime 方法
定義
重要
部分資訊涉及發行前產品,在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊,不做任何明確或隱含的瑕疵擔保。
多載
SetLastAccessTime(String, DateTime) |
設定上次存取指定檔案的日期和時間。 |
SetLastAccessTime(SafeFileHandle, DateTime) |
設定上次存取指定檔案或目錄的日期和時間。 |
SetLastAccessTime(String, DateTime)
- 來源:
- File.cs
- 來源:
- File.cs
- 來源:
- File.cs
設定上次存取指定檔案的日期和時間。
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)
參數
- path
- String
要設定存取日期和時間信息的檔案。
例外狀況
比 2.1 舊的 .NET Framework 和 .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() 方法來查詢無效的字元。
path
null
。
指定的路徑、檔名或兩者都超過系統定義的最大長度。
找不到指定的路徑。
呼叫端沒有必要的許可權。
path
格式無效。
lastAccessTime
指定超出此作業允許的日期或時間範圍以外的值。
範例
下列範例會檢查文件系統是否有指定的檔案,並視需要建立它,然後設定並取得上次存取時間。
using namespace System;
using namespace System::IO;
int main()
{
try
{
String^ path = "c:\\Temp\\MyTest.txt";
if ( !File::Exists( path ) )
{
File::Create( path );
// 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
備註
path
參數可以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。
如需一般 I/O 工作的清單,請參閱 一般 I/O 工作。
另請參閱
- FileSystemWatcher
- 檔案和串流 I/O
- 從檔案 讀取文字
- 如何:將文字寫入檔案
適用於
SetLastAccessTime(SafeFileHandle, DateTime)
- 來源:
- File.cs
- 來源:
- File.cs
- 來源:
- File.cs
設定上次存取指定檔案或目錄的日期和時間。
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)
參數
- fileHandle
- SafeFileHandle
要設定上次存取日期和時間資訊的檔案或目錄 SafeFileHandle。
例外狀況
fileHandle
null
。
lastAccessTime
指定超出此作業允許的日期、時間或兩者範圍以外的值。
呼叫端沒有必要的許可權。
執行作業時發生 I/O 錯誤。