C#UDP编程总结

// 如果只使用一个EndPoint，维持一个引用。

private static UdpClient udpClient;



static void Main(string[] args)

{

    if (udpClient != null)

    {

        // 这段很重要

        udpClient.Close();

    }

    udpClient = new UdpClient(10250);

    udpClient.Client.SendBufferSize = 120400;

    udpClient.Client.SendTimeout = 1000;

    udpClient.Client.ReceiveBufferSize = 120400;

    udpClient.Client.ReceiveTimeout = 1000;

    IPEndPoint endPoint;

    try

    {

        endPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 1025);

        udpClient.Connect(endPoint);

    }

    catch (Exception)

    {

        return;

        // 连不上目标端口

    }

    var bytes = new byte[0];

    udpClient.Send(bytes, bytes.Length);

    var receiver = new BackgroundWorker();

    receiver.WorkerSupportsCancellation = true;

    receiver.DoWork += delegate

        {

            while (receiver.CancellationPending)

            {

                try

                {

                    var a = udpClient.Receive(ref endPoint);

                    receiver.CancelAsync();

                }

                catch (Exception)

                {

                    return;

                    // 对方断开连接或超时

                }

            }

        };

    receiver.RunWorkerAsync();

}