TcpListener.BeginAcceptTcpClient(AsyncCallback, Object) Methode

Definition

Beginnt einen asynchronen Vorgang, um eine eingehende Verbindung anzunehmen.Begins an asynchronous operation to accept an incoming connection attempt.

public:
 IAsyncResult ^ BeginAcceptTcpClient(AsyncCallback ^ callback, System::Object ^ state);
public IAsyncResult? BeginAcceptTcpClient (AsyncCallback callback, object state);
public IAsyncResult BeginAcceptTcpClient (AsyncCallback callback, object state);
member this.BeginAcceptTcpClient : AsyncCallback * obj -> IAsyncResult
Public Function BeginAcceptTcpClient (callback As AsyncCallback, state As Object) As IAsyncResult

Parameter

callback
AsyncCallback

Ein AsyncCallback-Delegat, der auf die Methode verweist, die bei Abschluss des Vorgangs aufgerufen werden soll.An AsyncCallback delegate that references the method to invoke when the operation is complete.

state
Object

Ein benutzerdefiniertes Objekt, das Informationen über den Annahmevorgang enthält.A user-defined object containing information about the accept operation. Dieses Objekt wird bei Abschluss des Vorgangs an den callback-Delegaten übergeben.This object is passed to the callback delegate when the operation is complete.

Gibt zurück

IAsyncResult

Ein IAsyncResult, das auf die asynchrone Erstellung des TcpClient verweist.An IAsyncResult that references the asynchronous creation of the TcpClient.

Ausnahmen

Beim Zugriff auf den Socket ist ein Fehler aufgetreten.An error occurred while attempting to access the socket.

Der Socket wurde geschlossen.The Socket has been closed.

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie die BeginAcceptTcpClient -Methode verwendet wird, um einen Socket zu erstellen und zu verbinden.The following code example demonstrates the use of the BeginAcceptTcpClient method to create and connect a socket. Der Rückruf Delegat ruft die- EndAcceptTcpClient Methode auf, um die asynchrone Anforderung zu beenden.The callback delegate calls the EndAcceptTcpClient method to end the asynchronous request.

    // Thread signal.
public:
    static ManualResetEvent^ TcpClientConnected;

    // Accept one client connection asynchronously.
public:
    static void DoBeginAcceptTcpClient(TcpListener^ listener)
    {
        // Set the event to nonsignaled state.
        TcpClientConnected->Reset();

        // Start to listen for connections from a client.
        Console::WriteLine("Waiting for a connection...");

        // Accept the connection.
        // BeginAcceptSocket() creates the accepted socket.
        listener->BeginAcceptTcpClient(
            gcnew AsyncCallback(DoAcceptTcpClientCallback),
            listener);

        // Wait until a connection is made and processed before
        // continuing.
        TcpClientConnected->WaitOne();
    }

    // Process the client connection.
public:
    static void DoAcceptTcpClientCallback(IAsyncResult^ result)
    {
        // Get the listener that handles the client request.
        TcpListener^ listener = (TcpListener^) result->AsyncState;

        // End the operation and display the received data on
        // the console.
        TcpClient^ client = listener->EndAcceptTcpClient(result);

        // Process the connection here. (Add the client to a
        // server table, read data, etc.)
        Console::WriteLine("Client connected completed");

        // Signal the calling thread to continue.
        TcpClientConnected->Set();

    }
// Thread signal.
public static ManualResetEvent tcpClientConnected =
    new ManualResetEvent(false);

// Accept one client connection asynchronously.
public static void DoBeginAcceptTcpClient(TcpListener
    listener)
{
    // Set the event to nonsignaled state.
    tcpClientConnected.Reset();

    // Start to listen for connections from a client.
    Console.WriteLine("Waiting for a connection...");

    // Accept the connection.
    // BeginAcceptSocket() creates the accepted socket.
    listener.BeginAcceptTcpClient(
        new AsyncCallback(DoAcceptTcpClientCallback),
        listener);

    // Wait until a connection is made and processed before
    // continuing.
    tcpClientConnected.WaitOne();
}

// Process the client connection.
public static void DoAcceptTcpClientCallback(IAsyncResult ar)
{
    // Get the listener that handles the client request.
    TcpListener listener = (TcpListener) ar.AsyncState;

    // End the operation and display the received data on
    // the console.
    TcpClient client = listener.EndAcceptTcpClient(ar);

    // Process the connection here. (Add the client to a
    // server table, read data, etc.)
    Console.WriteLine("Client connected completed");

    // Signal the calling thread to continue.
    tcpClientConnected.Set();
}
' Thread signal.
Public Shared tcpClientConnected As New ManualResetEvent(False)


' Accept one client connection asynchronously.
Public Shared Sub DoBeginAcceptTcpClient(listener As TcpListener)
   ' Set the event to nonsignaled state.
   tcpClientConnected.Reset()
   
   ' Start to listen for connections from a client.
   Console.WriteLine("Waiting for a connection...")
   
   ' Accept the connection. 
   ' BeginAcceptSocket() creates the accepted socket.
   listener.BeginAcceptTcpClient(New AsyncCallback(AddressOf DoAcceptTcpClientCallback), listener)
   
   ' Wait until a connection is made and processed before 
   ' continuing.
   tcpClientConnected.WaitOne()
End Sub


' Process the client connection.
Public Shared Sub DoAcceptTcpClientCallback(ar As IAsyncResult)
   ' Get the listener that handles the client request.
   Dim listener As TcpListener = CType(ar.AsyncState, TcpListener)
   
   ' End the operation and display the received data on 
   ' the console.
   Dim client As TcpClient = listener.EndAcceptTcpClient(ar)
   
   ' Process the connection here. (Add the client to a
   ' server table, read data, etc.)
   Console.WriteLine("Client connected completed")
   
   ' Signal the calling thread to continue.
   tcpClientConnected.Set()
End Sub
 

Hinweise

Der asynchrone BeginAcceptTcpClient Vorgang muss durch Aufrufen der-Methode abgeschlossen werden EndAcceptTcpClient .The asynchronous BeginAcceptTcpClient operation must be completed by calling the EndAcceptTcpClient method. In der Regel wird die-Methode vom-Delegaten aufgerufen callback .Typically, the method is invoked by the callback delegate.

Diese Methode wird nicht blockiert, bis der Vorgang abgeschlossen ist.This method does not block until the operation completes. Um zu blockieren, bis der Vorgang abgeschlossen ist, verwenden Sie die- AcceptTcpClient Methode.To block until the operation completes, use the AcceptTcpClient method.

Ausführliche Informationen zur Verwendung des asynchronen Programmiermodells finden Sie unter Asynchrones Aufrufen synchroner Methoden.For detailed information about using the asynchronous programming model, see Calling Synchronous Methods Asynchronously.

Hinweis

Wenn Sie einen erhalten SocketException , verwenden Sie die SocketException.ErrorCode -Eigenschaft, um den spezifischen Fehlercode abzurufen. eine ausführliche Beschreibung des Fehlers finden Sie in der API-Fehlercode Dokumentation von Windows Sockets, Version 2 .If you receive a SocketException, use the SocketException.ErrorCode property to obtain the specific error code and refer to the Windows Sockets version 2 API error code documentation for a detailed description of the error.

Hinweis

Dieser Member gibt Ablaufverfolgungsinformationen aus, wenn Sie die Netzwerkablaufverfolgung in der Anwendung aktivieren.This member outputs trace information when you enable network tracing in your application. Weitere Informationen finden Sie unter Netzwerk Ablauf Verfolgung in der .NET Framework.For more information, see Network Tracing in the .NET Framework.

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