测试网络连通情况

            //测试网络状态
            Ping p = new Ping();
            string pAddr = ConfigurationManager.AppSettings["pingAddr"];
            //创建Ping对象p    
            PingReply pr;
            pAddr = "www.baidu.com";
            Console.WriteLine("Ping:" +pAddr );
            int lost = 0;  //丢包数
            long rtt = 0; //ping回复时间

                for (int i = 0; i < 4; i++)
                {
                    //向指定IP或者主机名的计算机发送ICMP协议的ping数据包      
                    pr = p.Send(pAddr);
                    lost += pr.Status == IPStatus.Success ? 0 :1;            //  如果ping成功 , pr.Status == IPStatus.Success  
                    rtt += pr.RoundtripTime;

                    Console.WriteLine("来自："+pr.Address + "   字节：" + pr.Buffer.Length + "   时间" + pr.RoundtripTime + "ms   状态：" + pr.Status);

                    Thread.Sleep(2000);//等待2秒做下一次ping     
                }
                Console.WriteLine("测评：\r\nPing:" + pAddr + "    平均延时：" + rtt / 4 + "ms   丢包率：" +lost+"/4");