Directory.GetLastWriteTime Method
Returns the date and time the specified file or directory was last written to.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- path
- Type: System.String
The file or directory for which to obtain modification date and time information.
Return Value
Type: System.DateTimeA 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 | Condition |
|---|---|
| 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 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. |
Note
|
|---|
|
This method may return an inaccurate value, because it uses native functions whose values may not be continuously updated by the operating system. |
If the directory described in the path parameter does not exist, this method returns 12:00 midnight, January 1, 1601 A.D. (C.E.) Coordinated Universal Time (UTC), adjusted to local time.
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.
The following code example demonstrates GetLastWriteTime.
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 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.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()); } } }
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FileIOPermission
for reading the specified file or directory. Associated enumeration: FileIOPermissionAccess.Read
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
