Directory.GetLastAccessTimeUtc(String) Méthode
Important
Certaines informations portent sur la préversion du produit qui est susceptible d’être en grande partie modifiée avant sa publication. Microsoft exclut toute garantie, expresse ou implicite, concernant les informations fournies ici.
Retourne la date/heure, au format UTC (Temps universel coordonné), du dernier accès au fichier ou au répertoire spécifié.
public:
static DateTime GetLastAccessTimeUtc(System::String ^ path);
public static DateTime GetLastAccessTimeUtc (string path);
static member GetLastAccessTimeUtc : string -> DateTime
Public Shared Function GetLastAccessTimeUtc (path As String) As DateTime
- path
- String
Fichier ou répertoire pour lequel obtenir les informations de date/heure d'accès.
Structure définie avec la date/heure du dernier accès au fichier ou au répertoire spécifié. Cette valeur est exprimée en temps UTC.
L'appelant n'a pas l'autorisation requise.
.NET Framework et .NET Core versions antérieures à 2.1 : path
est une chaîne de longueur nulle, contient uniquement des espaces blancs ou contient un ou plusieurs caractères non valides. Vous pouvez rechercher les caractères non valides avec la méthode GetInvalidPathChars().
path
a la valeur null
.
Le chemin et/ou le nom de fichier spécifiés dépassent la longueur maximale définie par le système.
Le format du paramètre path
est non valide.
L’exemple suivant illustre les différences de sortie lors de l’utilisation de la sortie utc (Temps universel coordonné).
// This sample shows the differences between dates from methods that use
//coordinated universal time (UTC) format and those that do not.
using namespace System;
using namespace System::IO;
int main()
{
// Set the directory.
String^ n = "C:\\test\\newdir";
//Create two variables to use to set the time.
DateTime dtime1 = DateTime(2002,1,3);
DateTime dtime2 = DateTime(1999,1,1);
//Create the directory.
try
{
Directory::CreateDirectory( n );
}
catch ( IOException^ e )
{
Console::WriteLine( e );
}
//Set the creation and last access times to a variable DateTime value.
Directory::SetCreationTime( n, dtime1 );
Directory::SetLastAccessTimeUtc( n, dtime1 );
// Print to console the results.
Console::WriteLine( "Creation Date: {0}", Directory::GetCreationTime( n ) );
Console::WriteLine( "UTC creation Date: {0}", Directory::GetCreationTimeUtc( n ) );
Console::WriteLine( "Last write time: {0}", Directory::GetLastWriteTime( n ) );
Console::WriteLine( "UTC last write time: {0}", Directory::GetLastWriteTimeUtc( n ) );
Console::WriteLine( "Last access time: {0}", Directory::GetLastAccessTime( n ) );
Console::WriteLine( "UTC last access time: {0}", Directory::GetLastAccessTimeUtc( n ) );
//Set the last write time to a different value.
Directory::SetLastWriteTimeUtc( n, dtime2 );
Console::WriteLine( "Changed last write time: {0}", Directory::GetLastWriteTimeUtc( n ) );
}
// Obviously, since this sample deals with dates and times, the output will vary
// depending on when you run the executable. Here is one example of the output:
//Creation Date: 1/3/2002 12:00:00 AM
//UTC creation Date: 1/3/2002 8:00:00 AM
//Last write time: 12/31/1998 4:00:00 PM
//UTC last write time: 1/1/1999 12:00:00 AM
//Last access time: 1/2/2002 4:00:00 PM
//UTC last access time: 1/3/2002 12:00:00 AM
//Changed last write time: 1/1/1999 12:00:00 AM
// This sample shows the differences between dates from methods that use
//coordinated universal time (UTC) format and those that do not.
using System;
using System.IO;
namespace IOSamples
{
public class DirectoryUTCTime
{
public static void Main()
{
// Set the directory.
string n = @"C:\test\newdir";
//Create two variables to use to set the time.
DateTime dtime1 = new DateTime(2002, 1, 3);
DateTime dtime2 = new DateTime(1999, 1, 1);
//Create the directory.
try
{
Directory.CreateDirectory(n);
}
catch (IOException e)
{
Console.WriteLine(e);
}
//Set the creation and last access times to a variable DateTime value.
Directory.SetCreationTime(n, dtime1);
Directory.SetLastAccessTimeUtc(n, dtime1);
// Print to console the results.
Console.WriteLine("Creation Date: {0}", Directory.GetCreationTime(n));
Console.WriteLine("UTC creation Date: {0}", Directory.GetCreationTimeUtc(n));
Console.WriteLine("Last write time: {0}", Directory.GetLastWriteTime(n));
Console.WriteLine("UTC last write time: {0}", Directory.GetLastWriteTimeUtc(n));
Console.WriteLine("Last access time: {0}", Directory.GetLastAccessTime(n));
Console.WriteLine("UTC last access time: {0}", Directory.GetLastAccessTimeUtc(n));
//Set the last write time to a different value.
Directory.SetLastWriteTimeUtc(n, dtime2);
Console.WriteLine("Changed last write time: {0}", Directory.GetLastWriteTimeUtc(n));
}
}
}
// Obviously, since this sample deals with dates and times, the output will vary
// depending on when you run the executable. Here is one example of the output:
//Creation Date: 1/3/2002 12:00:00 AM
//UTC creation Date: 1/3/2002 8:00:00 AM
//Last write time: 12/31/1998 4:00:00 PM
//UTC last write time: 1/1/1999 12:00:00 AM
//Last access time: 1/2/2002 4:00:00 PM
//UTC last access time: 1/3/2002 12:00:00 AM
//Changed last write time: 1/1/1999 12:00:00 AM
// This sample shows the differences between dates from methods that use
//coordinated universal time (UTC) format and those that do not.
open System
open System.IO
// Set the directory.
let n = @"C:\test\newdir"
//Create two variables to use to set the time.
let dtime1 = DateTime(2002, 1, 3)
let dtime2 = DateTime(1999, 1, 1)
//Create the directory.
try
Directory.CreateDirectory n |> ignore
with :? IOException as e ->
printfn $"{e}"
//Set the creation and last access times to a variable DateTime value.
Directory.SetCreationTime(n, dtime1)
Directory.SetLastAccessTimeUtc(n, dtime1)
// Print to console the results.
printfn $"Creation Date: {Directory.GetCreationTime n}"
printfn $"UTC creation Date: {Directory.GetCreationTimeUtc n}"
printfn $"Last write time: {Directory.GetLastWriteTime n}"
printfn $"UTC last write time: {Directory.GetLastWriteTimeUtc n}"
printfn $"Last access time: {Directory.GetLastAccessTime n}"
printfn $"UTC last access time: {Directory.GetLastAccessTimeUtc n}"
//Set the last write time to a different value.
Directory.SetLastWriteTimeUtc(n, dtime2)
printfn $"Changed last write time: {Directory.GetLastWriteTimeUtc n}"
// Obviously, since this sample deals with dates and times, the output will vary
// depending on when you run the executable. Here is one example of the output:
//Creation Date: 1/3/2002 12:00:00 AM
//UTC creation Date: 1/3/2002 8:00:00 AM
//Last write time: 12/31/1998 4:00:00 PM
//UTC last write time: 1/1/1999 12:00:00 AM
//Last access time: 1/2/2002 4:00:00 PM
//UTC last access time: 1/3/2002 12:00:00 AM
//Changed last write time: 1/1/1999 12:00:00 AM
' This sample shows the differences between dates from methods that use
'coordinated universal time (UTC) format and those that do not.
Imports System.IO
Public Class DirectoryUTCTime
Public Shared Sub Main()
' Set the directory.
Dim n As String = "C:\test\newdir"
'Create two variables to use to set the time.
Dim dtime1 As New DateTime(2002, 1, 3)
Dim dtime2 As New DateTime(1999, 1, 1)
'Create the directory.
Try
Directory.CreateDirectory(n)
Catch e As IOException
Console.WriteLine(e)
End Try
'Set the creation and last access times to a variable DateTime value.
Directory.SetCreationTime(n, dtime1)
Directory.SetLastAccessTimeUtc(n, dtime1)
' Print to console the results.
Console.WriteLine("Creation Date: {0}", Directory.GetCreationTime(n))
Console.WriteLine("UTC creation Date: {0}", Directory.GetCreationTimeUtc(n))
Console.WriteLine("Last write time: {0}", Directory.GetLastWriteTime(n))
Console.WriteLine("UTC last write time: {0}", Directory.GetLastWriteTimeUtc(n))
Console.WriteLine("Last access time: {0}", Directory.GetLastAccessTime(n))
Console.WriteLine("UTC last access time: {0}", Directory.GetLastAccessTimeUtc(n))
'Set the last write time to a different value.
Directory.SetLastWriteTimeUtc(n, dtime2)
Console.WriteLine("Changed last write time: {0}", Directory.GetLastWriteTimeUtc(n))
End Sub
End Class
' Since this sample deals with dates and times, the output will vary
' depending on when you run the executable. Here is one example of the output:
' Creation Date: 1/3/2002 12:00:00 AM
' UTC creation Date: 1/3/2002 8:00:00 AM
' Last write time: 12/31/1998 4:00:00 PM
' UTC last write time: 1/1/1999 12:00:00 AM
' Last access time: 1/2/2002 4:00:00 PM
' UTC last access time: 1/3/2002 12:00:00 AM
' Changed last write time: 1/1/1999 12:00:00 AM
Note
Cette méthode peut retourner une valeur inexacte, car elle utilise des fonctions natives dont les valeurs ne peuvent pas être mises à jour en continu par le système d’exploitation.
Si le répertoire décrit dans le path
paramètre n’existe pas, cette méthode retourne 12 :00 minuit, le 1er janvier 1601 (C.E.) Temps universel coordonné (UTC).
Pour obtenir la liste des tâches d’E/S courantes, consultez Tâches courantes d’E/S.
Commentaires sur .NET
.NET est un projet open source. Sélectionnez un lien pour fournir des commentaires: