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FileSystemInfo.LastAccessTime Property

Updated: January 2010

Gets or sets the time the current file or directory was last accessed.

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

public DateTime LastAccessTime { get; set; }

Property Value

Type: System.DateTime
The time that the current file or directory was last accessed.

ExceptionCondition
IOException

Refresh cannot initialize the data.

PlatformNotSupportedException

The current operating system is not Microsoft Windows NT or later.

Note   This method may return an inaccurate value, because it uses native functions whose values may not be continuously updated by the operating system.

When first called, FileSystemInfo calls Refresh and returns the cached information on APIs to get attributes and so on. On subsequent calls, you must call Refresh to get the latest copy of the information.

If the file described in the FileSystemInfo object does not exist, this property will return 12:00 midnight, January 1, 1601 A.D. (C.E.) Coordinated Universal Time (UTC), adjusted to local time.

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 property, and DirectoryInfo implementations of this property are not supported.

Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows CE Platform Note: This property is read-only.

The following code example demonstrates the updating of the LastAccessTime property through a "touch" operation. In this example, the file is "touched", updating the CreationTime, LastAccessTime and LastWriteTime properties to the current date and time.

using System;
using System.IO;

namespace touch
{
    class Touch
    {
        static void Main(string[] args)
        {
            // Make sure a filename was provided. 
            if (args.Length > 0)
            {
                // Verify that the provided filename exists. 
                if (File.Exists(args[0]))
                {
                    FileInfo fi = new FileInfo(args[0]);
                    touchFile(fi);
                }
                else
                {
                    Console.WriteLine(
                        "Could not find the file: {0}.", args[0]);
                }
            }
            else
            {
                Console.WriteLine("No file was specified.");
            }
        }

        static void touchFile(FileSystemInfo fsi)
        {
            Console.WriteLine("Touching: {0}", fsi.FullName);

            // Update the CreationTime, LastWriteTime and LastAccessTime. 
            try
            {
                fsi.CreationTime = fsi.LastWriteTime = fsi.LastAccessTime =
                    DateTime.Now;
            }
            catch (Exception e)
            {
                Console.WriteLine("Error: {0}", e.Message);
            }
        }
    }
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Date

History

Reason

January 2010

Updated remarks.

Customer feedback.

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