File.SetLastAccessTime Method

Definition

Namespace:

System.IO

Assembly:

System.Runtime.dll

Overloads

SetLastAccessTime(String, DateTime)	Sets the date and time the specified file was last accessed.
SetLastAccessTime(SafeFileHandle, DateTime)	Sets the date and time the specified file or directory was last accessed.

SetLastAccessTime(String, DateTime)

Source:

File.cs

Sets the date and time the specified file was last accessed.

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)

Parameters

path

String

The file for which to set the access date and time information.

lastAccessTime

DateTime

A DateTime containing the value to set for the last access date and time of path. This value is expressed in local time.

Exceptions

ArgumentException

.NET Framework and .NET Core versions older than 2.1: path is a zero-length string, contains only white space, or contains one or more invalid characters. You can query for invalid characters by using the GetInvalidPathChars() method.

ArgumentNullException

path is null.

PathTooLongException

The specified path, file name, or both exceed the system-defined maximum length.

FileNotFoundException

The specified path was not found.

UnauthorizedAccessException

The caller does not have the required permission.

NotSupportedException

path is in an invalid format.

ArgumentOutOfRangeException

lastAccessTime specifies a value outside the range of dates or times permitted for this operation.

Examples

The following example checks the file system for the specified file, creating it if necessary, and then sets and gets the last access time.

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

Remarks

The path parameter is permitted to specify relative or absolute path information. Relative path information is interpreted as relative to the current working directory. To obtain the current working directory, see GetCurrentDirectory.

For a list of common I/O tasks, see Common I/O Tasks.

See also

• FileSystemWatcher
• File and Stream I/O
• Reading Text From A File
• How to: Write Text to a File

SetLastAccessTime(SafeFileHandle, DateTime)

Source:

File.cs

Sets the date and time the specified file or directory was last accessed.

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)

Parameters

fileHandle

SafeFileHandle

A SafeFileHandle to the file or directory for which to set the last access date and time information.

lastAccessTime

DateTime

A DateTime containing the value to set for the last access date and time of fileHandle. This value is expressed in local time.

Exceptions

ArgumentNullException

fileHandle is null.

ArgumentOutOfRangeException

lastAccessTime specifies a value outside the range of dates, times, or both permitted for this operation.

UnauthorizedAccessException

The caller does not have the required permission.

IOException

An I/O error occurred while performing the operation.