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Directory.SetLastAccessTime Method

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

Namespace:  System.IO
Assembly:  mscorlib (in mscorlib.dll)

public static void SetLastAccessTime(
	string path,
	DateTime lastAccessTime
)

Parameters

path
Type: System.String

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

lastAccessTime
Type: System.DateTime

An object that contains the value to set for the access date and time of path. This value is expressed in local time.

ExceptionCondition
FileNotFoundException

The specified path was not found.

ArgumentException

path is a zero-length string, contains only white space, or contains one or more invalid characters. You can query for invalid characters with the GetInvalidPathChars method.

ArgumentNullException

path is null.

PathTooLongException

The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters and file names must be less than 260 characters.

UnauthorizedAccessException

The caller does not have the required permission.

PlatformNotSupportedException

The current operating system is not Windows NT or later.

ArgumentOutOfRangeException

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

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.

The path parameter is not case-sensitive.

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

Windows 95, Windows 98, Windows 98 Second Edition Platform Note: These operating systems do not support this method.

The following example demonstrates how to use SetLastAccessTime.

using System;
using System.IO;

class Test 
{
    public static void Main() 
    {
        try 
        {
            string path = @"c:\MyDir";
            if (!Directory.Exists(path)) 
            {
                Directory.CreateDirectory(path);
            }
            Directory.SetLastAccessTime(path, new DateTime(1985,5,4));

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

        catch (Exception e) 
        {
            Console.WriteLine("The process failed: {0}", e.ToString());
        }
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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