HttpWebResponse.LastModified Proprietà

Definizione

Spazio dei nomi:

System.Net

Assembly:

System.Net.Requests.dll

Origine:

HttpWebResponse.cs

Ottiene la data e l'ora dell'ultima modifica del contenuto della risposta.

public:
 property DateTime LastModified { DateTime get(); };

public DateTime LastModified { get; }

member this.LastModified : DateTime

Public ReadOnly Property LastModified As DateTime

Valore della proprietà

DateTime

Oggetto DateTime in cui è contenuta la data e l'ora dell'ultima modifica del contenuto della risposta.

Eccezioni

ObjectDisposedException

L'istanza corrente è stata eliminata.

Esempio

In questo esempio viene creata una HttpWebRequest query e per una risposta. In questo esempio viene quindi verificato se l'entità richiesta è stata modificata in qualsiasi momento.

Uri^ myUri = gcnew Uri( url );
// Creates an HttpWebRequest for the specified URL.
HttpWebRequest^ myHttpWebRequest = (HttpWebRequest^)( WebRequest::Create( myUri ) );
HttpWebResponse^ myHttpWebResponse = (HttpWebResponse^)( myHttpWebRequest->GetResponse() );
if ( myHttpWebResponse->StatusCode == HttpStatusCode::OK )
{
   Console::WriteLine( "\r\nRequest succeeded and the requested information is in the response , Description : {0}",
      myHttpWebResponse->StatusDescription );
}
DateTime today = DateTime::Now;
// Uses the LastModified property to compare with today's date.
if ( DateTime::Compare( today, myHttpWebResponse->LastModified ) == 0 )
{
   Console::WriteLine( "\nThe requested URI entity was modified today" );
}      
else if ( DateTime::Compare( today, myHttpWebResponse->LastModified ) == 1 )
{
   Console::WriteLine( "\nThe requested URI was last modified on: {0}",
      myHttpWebResponse->LastModified );
}
// Releases the resources of the response.
myHttpWebResponse->Close();

Uri myUri = new Uri(url);
    // Creates an HttpWebRequest for the specified URL.
    HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(myUri);
    HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
    if (myHttpWebResponse.StatusCode == HttpStatusCode.OK)
        Console.WriteLine("\r\nRequest succeeded and the requested information is in the response , Description : {0}",
                            myHttpWebResponse.StatusDescription);
    DateTime today = DateTime.Now;
    // Uses the LastModified property to compare with today's date.
    if (DateTime.Compare(today,myHttpWebResponse.LastModified) == 0)
        Console.WriteLine("\nThe requested URI entity was modified today");
    else
        if (DateTime.Compare(today,myHttpWebResponse.LastModified) == 1)
            Console.WriteLine("\nThe requested URI was last modified on:{0}",
                                myHttpWebResponse.LastModified);
    // Releases the resources of the response.
    myHttpWebResponse.Close();

Dim myUri As New Uri(url)
' Creates an HttpWebRequest for the specified URL.
Dim myHttpWebRequest As HttpWebRequest = CType(WebRequest.Create(myUri), HttpWebRequest)
Dim myHttpWebResponse As HttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
If myHttpWebResponse.StatusCode = HttpStatusCode.OK Then
    Console.WriteLine(ControlChars.Lf + ControlChars.Cr + "Request succeeded and the requested information is in the response , Description : {0}", myHttpWebResponse.StatusDescription)
End If
Dim today As DateTime = DateTime.Now
' Uses the LastModified property to compare with today's date.
If DateTime.Compare(today, myHttpWebResponse.LastModified) = 0 Then
    Console.WriteLine(ControlChars.Cr + "The requested URI entity was modified today")
Else
    If DateTime.Compare(today, myHttpWebResponse.LastModified) =  1 Then
        Console.WriteLine(ControlChars.Cr + "The requested Uri was last modified on:{0}", myHttpWebResponse.LastModified)
    End If
End If
' Releases the resources of the response.
myHttpWebResponse.Close()

Commenti

La LastModified proprietà contiene il valore dell'intestazione Last-Modified ricevuta con la risposta. Si presuppone che la data e l'ora siano ora locale.