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C# UdpClient使用Receive和BeginReceive接收消息时的不同写法

2024-07-11 12:59:29   218人阅读

使用Receive（同步阻塞方式）, 注意使用同步方法时，需要使用线程来开始方法，不然会使UI界面卡死

            IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 5858);            UdpClient udpClient = new UdpClient(RemoteIpEndPoint);            while (true) //由于Receive方法是阻塞方法，一个Receive操作完了后才能继续往下执行，所以能在这里使用死循环            {                Byte[] receiveBytes = udpClient.Receive(ref RemoteIpEndPoint);                string msg = Encoding.UTF8.GetString(receiveBytes);            }

 

使用BeginReceive（异步）

 

               private static void InitializeUdpClient()
              {               
                IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 5858);                UdpClient udpClient = new UdpClient(RemoteIpEndPoint);                //如果这里写while(true) 则会不停挂起异步接收操作，直到占满缓冲区间或队列。会报“由于系统缓冲区空间不足或队列已满，不能执行套接字上的操作”的错                UdpState s = new UdpState(udpClient, RemoteIpEndPoint);                udpClient.BeginReceive(EndReceive, s);              }        private static void EndReceive(IAsyncResult ar)        {            try            {                UdpState s = ar.AsyncState as UdpState;                if (s != null)                {                    UdpClient udpClient = s.UdpClient;                    IPEndPoint ip = s.IP;                    Byte[] receiveBytes = udpClient.EndReceive(ar, ref ip);                    string msg = Encoding.UTF8.GetString(receiveBytes);                                       udpClient.BeginReceive(EndReceive, s);//在这里重新开始一个异步接收，用于处理下一个网络请求                }            }            catch (Exception ex)            {                //处理异常            }        }    public class UdpState    {        private UdpClient udpclient = null;        public UdpClient UdpClient        {            get { return udpclient; }        }        private IPEndPoint ip;        public IPEndPoint IP        {            get { return ip; }        }        public UdpState(UdpClient udpclient, IPEndPoint ip)        {            this.udpclient = udpclient;            this.ip = ip;        }    }

 


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