C# UdpClient使用Receive和BeginReceive接收訊息時的不同寫法

標籤：style   blog   color   使用   io   re   

使用Receive（同步阻塞方式）, 注意使用同步方法時，需要使用線程來開始方法，不然會使UI介面卡死

            IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 5858);            UdpClient udpClient = new UdpClient(RemoteIpEndPoint);            while (true) //由於Receive方法是阻塞方法，一個Receive操作完了後才能繼續往下執行，所以能在這裡使用死迴圈            {                Byte[] receiveBytes = udpClient.Receive(ref RemoteIpEndPoint);                string msg = Encoding.UTF8.GetString(receiveBytes);            }

 

使用BeginReceive（非同步）

 

               private static void InitializeUdpClient()

              {               
                IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 5858);                UdpClient udpClient = new UdpClient(RemoteIpEndPoint);                //如果這裡寫while(true) 則會不停掛起非同步接收操作，直到佔滿緩衝區間或隊列。會報“由於系統緩衝區空間不足或隊列已滿，不能執行通訊端上的操作”的錯                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);//在這裡重新開始一個非同步接收，用於處理下一個網路請求                }            }            catch (Exception ex)            {                //處理異常            }        }    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;        }    }