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Directory.GetLastWriteTime Method

Returns the date and time the specified file or directory was last written to.

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

'Declaration
Public Shared Function GetLastWriteTime ( _
	path As String _
) As DateTime
'Usage
Dim path As String
Dim returnValue As DateTime

returnValue = Directory.GetLastWriteTime(path)
public static DateTime GetLastWriteTime (
	String path
)
public static function GetLastWriteTime (
	path : String
) : DateTime

Parameters

path

The file or directory for which to obtain modification date and time information.

Return Value

A DateTime structure set to the date and time the specified file or directory was last written to. This value is expressed in local time.

Exception typeCondition

IOException

The specified path was not found.

UnauthorizedAccessException

The caller does not have the required permission.

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.

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

The following code example demonstrates GetLastWriteTime.

Imports System
Imports System.IO

Public Class Test
    Public Shared Sub Main()
        Try
            Dim path As String = "c:\MyDir"
            If Directory.Exists(path) = False Then
                Directory.CreateDirectory(path)
            Else
                ' Take an action which will affect the write time.
                Directory.SetLastWriteTime(path, New DateTime(1985, 4, 3))
            End If

            ' Get the creation time of a well-known directory.
            Dim dt As DateTime = 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 e As Exception
            Console.WriteLine("The process failed: {0}", e.ToString())
        End Try
    End Sub
End Class

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 which will affect the write time.
                Directory.SetLastWriteTime(path, new DateTime(1985, 4, 3));
            }

            // Get the creation 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 CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, 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

.NET Compact Framework

Supported in: 2.0, 1.0

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