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Directory.SetLastWriteTime Method

Sets the date and time a directory was last written to.

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

public static void SetLastWriteTime (
	string path,
	DateTime lastWriteTime
)
public static void SetLastWriteTime (
	String path, 
	DateTime lastWriteTime
)
public static function SetLastWriteTime (
	path : String, 
	lastWriteTime : DateTime
)

Parameters

path

The path of the directory.

lastWriteTime

The date and time the directory was last written to. This value is expressed in local time.

Exception typeCondition

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 as defined by InvalidPathChars.

ArgumentNullException

path is a null reference (Nothing in Visual Basic).

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 Microsoft Windows NT or later.

ArgumentOutOfRangeException

lastWriteTime 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.

The following table lists examples of other typical or related I/O tasks.

To do this...

See the example in this topic...

Create a text file.

How to: Write Text to a File

Write to a text file.

How to: Write Text to a File

Read from a text file.

How to: Read Text from a File

Delete a directory.

Delete

Delete

See the subdirectories of a directory.

GetDirectories

GetDirectories

Find the size of a directory.

Directory

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

The following code example demonstrates SetLastWriteTime.

using System;
using System.IO;

class Test 
{
    public static void Main() 
    {
        try 
        {
            string path = @"c:\MyDir";
            if (!Directory.Exists(path)) 
            {
                Directory.CreateDirectory(path);
            } 
            else 
            {
                // Take an action that will affect the write time.
                Directory.SetLastWriteTime(path, new DateTime(1985,4,3));
            }

            // Get the last write time of a well-known directory.
            DateTime dt = Directory.GetLastWriteTime(path);
            Console.WriteLine("The last write time for this directory was {0}", dt);
			
            //Update the last write time.
            Directory.SetLastWriteTime(path, DateTime.Now);
            dt = Directory.GetLastWriteTime(path);
            Console.WriteLine("The last write time for this directory was {0}", dt);
        } 
        catch (Exception e) 
        {
            Console.WriteLine("The process failed: {0}", e.ToString());
        }
    }
}

import System.*;
import System.IO.*;

class Test
{
    public static void main(String[] args)
    {
        try {
            String path = "c:\\MyDir";

            if (!(Directory.Exists(path))) {
                Directory.CreateDirectory(path);
            }
            else {
                // Take an action that will affect the write time.
                Directory.SetLastWriteTime(path, new DateTime(1985, 4, 3));
            }

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

            //Update the last write time.
            Directory.SetLastWriteTime(path, DateTime.get_Now());
            dt = Directory.GetLastWriteTime(path);
            Console.WriteLine("The last write time for this directory was {0}",
                dt);
        }
        catch (System.Exception e) {
            Console.WriteLine("The process failed: {0}", e.ToString());
        }
    } //main
} //Test

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

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