Beginreceive/Endreceive传递参数

Question

我正在使用以下代码从udp套接字读取数据，它工作得很好。现在，我需要将recv中的'received‘传递回调用main。如何做到这一点呢？

   try
        {
          client.BeginReceive(new AsyncCallback(recv), client);
        }


   private static void recv(IAsyncResult res)
    {

        try
        {
            UdpClient c = (UdpClient)(res.AsyncState);

            IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 162);           
            byte[]  received = c.EndReceive(res, ref RemoteIpEndPoint);
            Console.WriteLine(ASCIIEncoding.ASCII.GetString(received));

            c.BeginReceive(new AsyncCallback(recv), c);

        }

        catch (Exception e)
        {
            Console.WriteLine(e);

        }
    }

Answer 1

在.Net 4.5中，您可以像这样使用async/await：

using (var udpClient = new UdpClient())
{
    try
    {
        udpClient.Connect(IPAddress.Any, 162);
        UdpReceiveResult receiveAsync = await udpClient.ReceiveAsync();
        Console.WriteLine(Encoding.ASCII.GetString(receiveAsync.Buffer));
    }
    catch (Exception e)
    {
        Console.WriteLine(e);
    }
}