File.GetLastWriteTime Method
Assembly: mscorlib (in mscorlib.dll)
Parameters
- path
The file or directory for which to obtain write date and time information.
Return Value
A DateTime structure set to the date and time that the specified file or directory was last written to. This value is expressed in local time.| Exception type | Condition |
|---|---|
| The caller does not have the required permission. |
|
| path is a zero-length string, contains only white space, or contains one or more invalid characters as defined by InvalidPathChars. |
|
| path is a null reference (Nothing in Visual Basic). |
|
| 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 specified path was not found. |
|
| path is in an invalid format. |
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 an example of using this method, see the Example section. The following table lists examples of other typical or related I/O tasks.
| To do this... | See the example in this topic... |
|---|---|
| Write to a text file. | |
| Read from a text file. | |
| Append text to a file. | |
| Rename or move a file. |
The following example demonstrates GetLastWriteTime.
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); } else { // Take an action that will affect the write time. File.SetLastWriteTime(path, new DateTime(1985,4,3)); } // Get the creation time of a well-known directory. DateTime dt = File.GetLastWriteTime(path); Console.WriteLine("The last write time for this file was {0}.", dt); // Update the last write time. File.SetLastWriteTime(path, DateTime.Now); dt = File.GetLastWriteTime(path); Console.WriteLine("The last write time for this file 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:\\Temp\\MyTest.txt";
if (!(File.Exists(path))) {
File.Create(path);
}
else {
// Take an action that will affect the write time.
File.SetLastWriteTime(path, new DateTime(1985, 4, 3));
}
// Get the creation time of a well-known directory.
DateTime dt = File.GetLastWriteTime(path);
Console.WriteLine("The last write time for this file was {0}.",
dt);
// Update the last write time.
File.SetLastWriteTime(path, DateTime.get_Now());
dt = File.GetLastWriteTime(path);
Console.WriteLine("The last write time for this file was {0}.",
dt);
}
catch (System.Exception e) {
Console.WriteLine("The process failed: {0}", e.ToString());
}
} //main
} //Test
- FileIOPermission for reading from the specified file. Associated enumeration: FileIOPermissionAccess.Read
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.
Reference
File ClassFile Members
System.IO Namespace
Other Resources
File and Stream I/OHow to: Read Text from a File
How to: Write Text to a File
