WebClient.DownloadStringCompleted Olay

public:
 event System::Net::DownloadStringCompletedEventHandler ^ DownloadStringCompleted;

public event System.Net.DownloadStringCompletedEventHandler? DownloadStringCompleted;

public event System.Net.DownloadStringCompletedEventHandler DownloadStringCompleted;

member this.DownloadStringCompleted : System.Net.DownloadStringCompletedEventHandler 

Public Custom Event DownloadStringCompleted As DownloadStringCompletedEventHandler 

Public Event DownloadStringCompleted As DownloadStringCompletedEventHandler 

Olay Türü

Örnekler

Aşağıdaki kod örneği, bu olay için bir olay işleyicisi ayarlamayı gösterir.

// Sample call : DownloadStringInBackground2 ("http://www.contoso.com/GameScores.html");
void DownloadStringInBackground2( String^ address )
{
   WebClient^ client = gcnew WebClient;
   Uri ^uri = gcnew Uri(address);

   // Specify that the DownloadStringCallback2 method gets called
   // when the download completes.
   client->DownloadStringCompleted += gcnew DownloadStringCompletedEventHandler( DownloadStringCallback2 );
   client->DownloadStringAsync( uri );
}

// Sample call : DownloadStringInBackground2 ("http://www.contoso.com/GameScores.html");
public static void DownloadStringInBackground2(string address)
{
    WebClient client = new WebClient();
    Uri uri = new Uri(address);

    // Specify that the DownloadStringCallback2 method gets called
    // when the download completes.
    client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(DownloadStringCallback2);
    client.DownloadStringAsync(uri);
}

'  Sample call : DownloadStringInBackground2 ("http:' www.contoso.com/GameScores.html")
Public Shared Sub DownloadStringInBackground2(ByVal address As String)

    Dim client As WebClient = New WebClient()

    '  Specify that the DownloadStringCallback2 method gets called
    '  when the download completes.
    AddHandler client.DownloadStringCompleted, AddressOf DownloadStringCallback2
                Dim uri as Uri = New Uri(address)
    client.DownloadStringAsync(uri)
End Sub

Aşağıdaki kod örneği, bu olay için bir işleyicinin uygulamasını gösterir.

void DownloadStringCallback2( Object^ /*sender*/, DownloadStringCompletedEventArgs^ e )
{

   // If the request was not canceled and did not throw
   // an exception, display the resource.
   if (  !e->Cancelled && e->Error == nullptr )
   {
      String^ textString = dynamic_cast<String^>(e->Result);
      Console::WriteLine( textString );
   }
}

private static void DownloadStringCallback2(Object sender, DownloadStringCompletedEventArgs e)
{
    // If the request was not canceled and did not throw
    // an exception, display the resource.
    if (!e.Cancelled && e.Error == null)
    {
        string textString = (string)e.Result;

        Console.WriteLine(textString);
    }
}

Private Shared Sub DownloadStringCallback2(ByVal sender As Object, ByVal e As DownloadStringCompletedEventArgs)

    '  If the request was not canceled and did not throw
    '  an exception, display the resource.
    If e.Cancelled = False AndAlso e.Error Is Nothing Then

        Dim textString As String = CStr(e.Result)
        Console.WriteLine(textString)
    End If
End Sub

Açıklamalar

Bu olay, bir kaynağı dize olarak indirmek için zaman uyumsuz bir işlem her tamamlandığında oluşturulur. Bu işlemler DownloadStringAsync yöntemleri çağrılarak başlatılır.

DownloadStringCompletedEventHandler bu olayın temsilcisidir. DownloadStringCompletedEventArgs sınıfı, olay işleyicisine olay verilerini sağlar.

Olayları işleme hakkında daha fazla bilgi için bkz. olayları işleme ve oluşturma.

Şunlara uygulanır