Note

Access to this page requires authorization. You can try signing in or .

Access to this page requires authorization. You can try .

File.SetLastAccessTime Method

Definition

Namespace:
System.IO
Assemblies:
mscorlib.dll, System.IO.FileSystem.dll
Assemblies:
netstandard.dll, System.Runtime.dll
Assemblies:
netstandard.dll, System.IO.FileSystem.dll
Assemblies:
netstandard.dll, System.IO.FileSystem.dll, System.Runtime.dll
Assembly:
System.IO.FileSystem.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Overloads

Name Description
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
Source:
File.cs
Source:
File.cs
Source:
File.cs
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

.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.

path is null.

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

The specified path was not found.

The caller does not have the required permission.

path is in an invalid format.

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 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

Applies to

SetLastAccessTime(SafeFileHandle, DateTime)

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

fileHandle is null.

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

The caller does not have the required permission.

An I/O error occurred while performing the operation.

Applies to


Feedback

Was this page helpful?