File.SetLastAccessTime Method
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SetLastAccessTime(String, DateTime) |
Sets the date and time the specified file was last accessed. |
SetLastAccessTime(SafeFileHandle, DateTime) |
Sets the date and time the specified file or directory was last accessed. |
- Source:
- File.cs
- Source:
- File.cs
- Source:
- File.cs
Sets the date and time the specified file was last accessed.
public:
static void SetLastAccessTime(System::String ^ path, DateTime lastAccessTime);
public static void SetLastAccessTime (string path, DateTime lastAccessTime);
static member SetLastAccessTime : string * DateTime -> unit
Public Shared Sub SetLastAccessTime (path As String, lastAccessTime As DateTime)
Parameters
- path
- String
The file for which to set the access date and time information.
- lastAccessTime
- DateTime
A DateTime containing the value to set for the last access date and time of path
. This value is expressed in local time.
Exceptions
.NET Framework and .NET Core versions older than 2.1: path
is a zero-length string, contains only white space, or contains one or more invalid characters. You can query for invalid characters by using the GetInvalidPathChars() method.
path
is null
.
The specified path, file name, or both exceed the system-defined maximum length.
The specified path was not found.
The caller does not have the required permission.
path
is in an invalid format.
lastAccessTime
specifies a value outside the range of dates or times permitted for this operation.
Examples
The following example checks the file system for the specified file, creating it if necessary, and then sets and gets the last access time.
using namespace System;
using namespace System::IO;
int main()
{
try
{
String^ path = "c:\\Temp\\MyTest.txt";
if ( !File::Exists( path ) )
{
File::Create( path );
// Update the last access time.
}
File::SetLastAccessTime( path, DateTime(1985,5,4) );
// Get the creation time of a well-known directory.
DateTime dt = File::GetLastAccessTime( path );
Console::WriteLine( "The last access time for this file was {0}.", dt );
// Update the last access time.
File::SetLastAccessTime( path, DateTime::Now );
dt = File::GetLastAccessTime( path );
Console::WriteLine( "The last access time for this file was {0}.", dt );
}
catch ( Exception^ e )
{
Console::WriteLine( "The process failed: {0}", e );
}
}
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);
// Update the last access time.
}
File.SetLastAccessTime(path, new DateTime(1985,5,4));
// Get the creation time of a well-known directory.
DateTime dt = File.GetLastAccessTime(path);
Console.WriteLine("The last access time for this file was {0}.", dt);
// Update the last access time.
File.SetLastAccessTime(path, DateTime.Now);
dt = File.GetLastAccessTime(path);
Console.WriteLine("The last access time for this file was {0}.", dt);
}
catch (Exception e)
{
Console.WriteLine("The process failed: {0}", e.ToString());
}
}
}
open System
open System.IO
try
let path = @"c:\Temp\MyTest.txt"
if File.Exists path |> not then
File.Create path |> ignore
// Update the last access time.
File.SetLastAccessTime(path, DateTime(1985, 5, 4))
// Get the creation time of a well-known directory.
let dt = File.GetLastAccessTime path
printfn $"The last access time for this file was {dt}."
// Update the last access time.
File.SetLastAccessTime(path, DateTime.Now)
let dt = File.GetLastAccessTime path
printfn $"The last access time for this file was {dt}."
with
| e -> printfn $"The process failed: {e}"
Imports System.IO
Imports System.Text
Public Class Test
Public Shared Sub Main()
Try
Dim path As String = "c:\Temp\MyTest.txt"
If File.Exists(path) = False Then
File.Create(path)
End If
File.SetLastAccessTime(path, New DateTime(1985, 5, 4))
' Get the creation time of a well-known directory.
Dim dt As DateTime = File.GetLastAccessTime(path)
Console.WriteLine("The last access time for this file was {0}.", dt)
' Update the last access time.
File.SetLastAccessTime(path, DateTime.Now)
dt = File.GetLastAccessTime(path)
Console.WriteLine("The last access time for this file was {0}.", dt)
Catch e As Exception
Console.WriteLine("The process failed: {0}", e.ToString())
End Try
End Sub
End Class
Remarks
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 a list of common I/O tasks, see Common I/O Tasks.
See also
Applies to
.NET 9 en andere versies
Product | Versies |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.3, 1.4, 1.6, 2.0, 2.1 |
UWP | 10.0 |
- Source:
- File.cs
- Source:
- File.cs
- Source:
- File.cs
Sets the date and time the specified file or directory was last accessed.
public:
static void SetLastAccessTime(Microsoft::Win32::SafeHandles::SafeFileHandle ^ fileHandle, DateTime lastAccessTime);
public static void SetLastAccessTime (Microsoft.Win32.SafeHandles.SafeFileHandle fileHandle, DateTime lastAccessTime);
static member SetLastAccessTime : Microsoft.Win32.SafeHandles.SafeFileHandle * DateTime -> unit
Public Shared Sub SetLastAccessTime (fileHandle As SafeFileHandle, lastAccessTime As DateTime)
Parameters
- fileHandle
- SafeFileHandle
A SafeFileHandle to the file or directory for which to set the last access date and time information.
- lastAccessTime
- DateTime
A DateTime containing the value to set for the last access date and time of fileHandle
.
This value is expressed in local time.
Exceptions
fileHandle
is null
.
lastAccessTime
specifies a value outside the range of dates, times, or both permitted for this operation.
The caller does not have the required permission.
An I/O error occurred while performing the operation.
Applies to
.NET 9 en andere versies
Product | Versies |
---|---|
.NET | 7, 8, 9 |
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