public partial class NetJiankongForm2 : Form{public NetJiankongForm2(){InitializeComponent();}private MyNetWorkMatchClass[] m_MNWMadapters;private MyNetWorkMonitor monitor;private void NetJiankongForm2_Load(object sender, EventArgs e){monitor = new MyNetWorkMonitor();m_MNWMadapters = monitor.Adapters;   //获得控制器MyNetWorkMonitor上所有计算机的适配器列表if (m_MNWMadapters.Length == 0){listBox1.Enabled = false;MessageBox.Show("在计算机上没有找到网络适配器");return;}listBox1.Items.AddRange(m_MNWMadapters); }private void listBox1_SelectedIndexChanged(object sender, EventArgs e)      //选中其中一个适配器
        {monitor.StopMonitoring();monitor.StartMonitoring(m_MNWMadapters[listBox1.SelectedIndex]);     //控制该适配器开始工作this.timer1.Start();                                      //计时开始
        }private void timer1_Tick(object sender, EventArgs e)    //计时开始,用于每秒钟改变显示速度
        {MyNetWorkMatchClass adapter = m_MNWMadapters[listBox1.SelectedIndex];    //该适配器textBox_Down.Text = String.Format("{0:n} kbps", adapter.DownloadSpeedKbps);   //得到该适配器的下载速度textBox_Up.Text = String.Format("{0:n} kbps", adapter.UploadSpeedKbps);     //得到该适配器的上传速度
        }}public class MyNetWorkMonitor{private System.Timers.Timer Monitor_Timer;              // 计时器事件执行每秒钟刷新值在适配器。private ArrayList m_AdaptersList;        //该计算机的适配器列表。private ArrayList m_MonitoredAdapters;      //目前控制的适配器列表public MyNetWorkMonitor(){m_AdaptersList = new ArrayList();          //用来保存获取到的计算机的适配器列表m_MonitoredAdapters = new ArrayList();         //运行的有效的适配器列表
ShowNetAdapter();                                //列举出安装在该计算机上面的适配器Monitor_Timer = new System.Timers.Timer(1000);Monitor_Timer.Elapsed += new ElapsedEventHandler(timer_ElapsedClick);}private void timer_ElapsedClick(object sender, ElapsedEventArgs e)     //用于每秒钟刷新速度
        {foreach (MyNetWorkMatchClass adapter in m_MonitoredAdapters)       //每秒钟遍历有效的网络适配器
            {adapter.CaculateAndRefresh();                                           //刷新上传下载速度
            }}private void ShowNetAdapter()    //列举出安装在该计算机上面的适配器方法
        {PerformanceCounterCategory PCCCategory = new PerformanceCounterCategory("Network Interface");foreach (string InstanceName in PCCCategory.GetInstanceNames()){if (InstanceName == "MS TCP Loopback interface")continue;//  创建一个实例Net workAdapter类别，并创建性能计数器它。MyNetWorkMatchClass myMNWMadapter = new MyNetWorkMatchClass(InstanceName);myMNWMadapter.m_Performance_Down = new PerformanceCounter("Network Interface", "Bytes Received/sec", InstanceName);myMNWMadapter.m_Performance_Up = new PerformanceCounter("Network Interface", "Bytes Sent/sec", InstanceName);m_AdaptersList.Add(myMNWMadapter);}}public void StartMonitoring(){if (m_AdaptersList.Count > 0){foreach (MyNetWorkMatchClass myMNWMadapter in m_AdaptersList)if (!m_MonitoredAdapters.Contains(myMNWMadapter)){m_MonitoredAdapters.Add(myMNWMadapter);myMNWMadapter.Start();}Monitor_Timer.Enabled = true;}}public void StartMonitoring(MyNetWorkMatchClass myMNWMadapter)     //控制该适配器开始工作
        {if (!m_MonitoredAdapters.Contains(myMNWMadapter))      {m_MonitoredAdapters.Add(myMNWMadapter);myMNWMadapter.Start();                           //该适配器调用自己函数开始工作
            }Monitor_Timer.Enabled = true;}public void StopMonitoring(){m_MonitoredAdapters.Clear();Monitor_Timer.Enabled = false;}public void StopMonitoring(MyNetWorkMatchClass adapter){if (m_MonitoredAdapters.Contains(adapter))m_MonitoredAdapters.Remove(adapter);if (m_MonitoredAdapters.Count == 0)Monitor_Timer.Enabled = false;}public MyNetWorkMatchClass[] Adapters                //该控制类所控制的找出所有适配器的适配器列表
        {get{return (MyNetWorkMatchClass[])m_AdaptersList.ToArray(typeof(MyNetWorkMatchClass));}}}//一个安装在计算机上的网络适配器，该类可用于获取网络中的流量public class MyNetWorkMatchClass{public override string ToString(){return m_strMatchName;}public string strMatchName{get{return m_strMatchName;}}public long DownloadSpeed{get{return m_lDownLoadSpeed;}}public long UploadSpeed{get{return m_lUpLoadSpeed;}}public double DownloadSpeedKbps{get{return this.m_lUpLoadSpeed / 1024.0;}}public double UploadSpeedKbps{get{return this.m_lUpLoadSpeed / 1024.0;}}private long m_lDownLoadNetValues1;           //当前的下载速度,字节计算private long m_lUploadNetValues1;             //当前的上传速度private long m_lDownLoadNetValues2;           //一秒前的下载速度,字节计算private long m_lUploadNetValues2;             //一秒前的上传速度private string m_strMatchName;     //此适配器的名字internal PerformanceCounter m_Performance_Down;    //控制下载速度的流量计算中心internal PerformanceCounter m_Performance_Up;     // //控制上传速度的流量计算中心private long m_lDownLoadSpeed;      //每秒钟下载速度private long m_lUpLoadSpeed;          //每秒钟上传速度public MyNetWorkMatchClass(string strComputerNetName){m_lDownLoadNetValues1 = 0;m_strMatchName = strComputerNetName;m_lUploadNetValues1 = 0;m_lDownLoadNetValues2 = 0;m_lUploadNetValues2 = 0;}//该适配器准备控制的方法函数public void Start(){m_lUploadNetValues1 = m_Performance_Up.NextSample().RawValue;m_lDownLoadNetValues1 = m_Performance_Down.NextSample().RawValue;}public void CaculateAndRefresh()                //计算速度
        {m_lDownLoadNetValues2 = m_Performance_Down.NextSample().RawValue;m_lUploadNetValues2 = m_Performance_Up.NextSample().RawValue;m_lDownLoadSpeed = m_lDownLoadNetValues2 - m_lDownLoadNetValues1;m_lUpLoadSpeed = m_lUploadNetValues2 - m_lUploadNetValues1;m_lDownLoadNetValues1 = m_lDownLoadNetValues2;m_lUploadNetValues1 = m_lUploadNetValues2;}}