c# 网速监控

  class Program
    {

        //实例化一个性能计数器，统计网卡流量：发送，字节
        private static System.Diagnostics.PerformanceCounter _sendCounter;

        //实例化一个性能计数器，统计网卡流量：接收，字节
        private static System.Diagnostics.PerformanceCounter _receivedCounter;

        //打印的地址
        private static readonly string filePath = System.IO.Directory.GetCurrentDirectory() + "\\NetworkMonitor.csv";

        static void Main(string[] args)
        {
            Console.Title = "流量监控";

            var adapter = GetNetworkInterface();
            Console.WriteLine("当前连接名称： "+ adapter.Name);
            if (adapter.NetworkInterfaceType.ToString() == "Loopback")
            {
                Console.WriteLine("当前暂无网络连接");
                Console.ReadLine();
                return;
            }
            else
            {
                //实例化一个性能计数器，统计网卡流量：发送，字节
                _sendCounter = new System.Diagnostics.PerformanceCounter("Network Interface", "Bytes Sent/sec", adapter.Description);

                //实例化一个性能计数器，统计网卡流量：接收，字节
                _receivedCounter = new System.Diagnostics.PerformanceCounter("Network Interface", "Bytes Received/sec", adapter.Description);

                WriteMessage(filePath, "当前时间,上行,下行");

                var time = ConfigurationManager.AppSettings["Timer"];

                System.Threading.Timer timer = new System.Threading.Timer(new System.Threading.TimerCallback(Counter), null,
                    0, Convert.ToInt32(time));

            }

            Console.ReadLine();
        }

        //定时输出
        private static void Counter(object state)
        {

            float sed = _sendCounter.NextValue() / 1024;
            float red = _receivedCounter.NextValue() / 1024;
            StringBuilder str = new StringBuilder();

            str.Append("上行： " + sed.ToString("0.00") + "kbps\r\n");
            str.Append("下行： " + red.ToString("0.00") + "kbps\r\n");
            str.Append("---------------------------------------\r\n");
            Console.WriteLine(str);

            WriteMessage(filePath, DateTime.Now + "," + sed.ToString("0.00") + "," + red.ToString("0.00"));

        }

        /// <summary>
        /// 输出指定信息到文本文件
        /// </summary>
        /// <param name="path">文本文件路径</param>
        /// <param name="msg">输出信息</param>
        public static void WriteMessage(string path, string msg)
        {
            try
            {
                using (FileStream fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write))
                {
                    using (StreamWriter sw = new StreamWriter(fs))
                    {
                        sw.BaseStream.Seek(0, SeekOrigin.End);
                        sw.WriteLine("{0}", msg, DateTime.Now);
                        sw.Flush();
                    }
                }
            }
            catch (Exception ex)
            {

                Console.WriteLine("写入文件失败: " + ex.Message);
            }

        }


        /// <summary>
        /// 获取本地计算机上网络接口的对象
        /// </summary>
        /// <returns></returns>
        public static NetworkInterface GetNetworkInterface()
        {
            NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();
            return adapters.FirstOrDefault(adapter => adapter.OperationalStatus == System.Net.NetworkInformation.OperationalStatus.Up);
        }
    }