using System;using System.Collections.Generic;using System.Text;using System.Net;using System.Net.Sockets;

namespace Dachie{class Program    {static void Main(string[] args)        {                    }    }public class MessageUtility    {

//缺省端口号        private const int DEFAULT_PORT = 49967;

private MessageUtility()        {//// TODO: 在此处添加构造函数逻辑//        }

//发送消息方法        public static void SendMessage(string msg)        {byte[] data = new byte[1024];//本机主机信息            IPHostEntry host = Dns.GetHostByName(Dns.GetHostName());

//端口号参数以后重构时可以做成一个方法从配置文件中读取端口号            IPEndPoint ipep = new IPEndPoint(host.AddressList[0], DEFAULT_PORT);

//创建一个udp套接字            Socket server = new Socket(AddressFamily.InterNetwork,                SocketType.Dgram, ProtocolType.Udp);

if (msg.Length != 0)            {                data = Encoding.Unicode.GetBytes(msg);try                {                    server.SendTo(data, data.Length, SocketFlags.None, ipep);                }catch (SocketException) { }finally                {                    server.Close();                }

            }

        }

//接受消息方法        public static string ReceiveMessage()        {int recv;byte[] data = new byte[1024];

//创建一个随机终结点对象            IPEndPoint ipep = new IPEndPoint(IPAddress.Any, DEFAULT_PORT);

//创建一个Udp套接字            Socket newsock = new Socket(                AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

//将随机终结点与Udp套接字绑定，以等待流入的数据包            newsock.Bind(ipep);

//创建一个接受任意发送者的终结点            IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);            EndPoint tmpRemote = (EndPoint)(sender);

try            {                recv = newsock.ReceiveFrom(data, ref tmpRemote);return Encoding.Unicode.GetString(data, 0, data.Length);            }catch (SocketException)            {return null;            }finally            {                newsock.Close();//关闭套接字释放资源            }

        }

    }}