如何为async-await调用创建包装器？

Question

从我可以告诉,对于没有内置(或框架扩展)的支持ConnectAsync/ AcceptAsync/ SendAsync/ ReceiveAsync等.我怎么会写我自己的包装,将通过异步等待机制的支持.例如,我当前的代码处理ReceiveAsyn内联和回调c(在其中指定SocketAsyncEventArgs):

private void PostReceive(SocketAsyncEventArgs e)
{       
    e.SetBuffer(ReceiveBuffer.DataBuffer, ReceiveBuffer.Count, ReceiveBuffer.Remaining);            
    e.Completed += Receive_Completed;

            // if ReceiveAsync returns false, then completion happened inline
    if (m_RemoteSocket.ReceiveAsync(e) == false)
    {
        Receive_Completed(this, e);
    }                          
}

.

private void Receive_Completed(object sender, SocketAsyncEventArgs e)
{   
    e.Completed -= Receive_Completed;       

    if (e.BytesTransferred == 0 || e.SocketError != SocketError.Success)
    {
        if (e.BytesTransferred > 0)
        {                   
            OnDataReceived(e);
        }

        Disconnect(e);                
        return;
    }

    OnDataReceived(e);

    //
    // we do not push the SocketAsyncEventArgs back onto the pool, instead
    // we reuse it in the next receive call
    //
    PostReceive(e);
}

Answer 1

诀窍是使用TaskCompletionSource来处理这种情况。

我在博客上谈到了这一点。有关详细信息，请参阅为 Await 准备现有代码。