PerformanceCounter基础知识：

参考

Performance Counter的使用

利用PerformanceCounter进行网卡流量监控

方法一：利用PerformanceCounter实例.NextValue()计算网卡下载速率
NextValue()使用注意（文章末尾）

namespace GPS222
{public partial class Form2 : Form{private PerformanceCounter mCounter;//当前计数器private void begin_n_Click(object sender, EventArgs e){timer2_net.Interval = 1000;//。1秒一次timer2_Tick事件timer2_net.Enabled = true;//初始化CounterPerformanceCounterCategory pcCategory = new PerformanceCounterCategory("Network Interface");string[] iNames = pcCategory.GetInstanceNames();//此函数第一次执行特别耗时（不知道为什么）PerformanceCounter[] pCounters = pcCategory.GetCounters(iNames[1]);//iNames[0]为"ASIX AX88772C USB2.0 to Fast Ethernet Adapter"；iNames[1]为"Intel[R] Ethernet Connection [7] I219-V"//给网络监控计数器赋值mCounter = pCounters[0];mCounter.NextValue();//初始值  }private void timer2_net_Tick(object sender, EventArgs e){                         double SpeedKbps = mCounter.NextValue() * 8 / 1000;if ((SpeedKbps / 1000) > 1){SpeedSendToolLabel.Text = String.Format("{0:f1} Mbps", SpeedKbps / 1000); //得到该适配器的上传速度}else{SpeedSendToolLabel.Text = String.Format("{0:f1} Kbps", SpeedKbps); //得到该适配器的上传速度}}

方法二（繁琐）：自定义了两个类：MyNetWorkMatchClass和MyNetWorkMonitor，利用PerformanceCounter实例.NextSample().RawValue自行计算网卡上传下载速率（CaculateAndRefresh()函数）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Collections;
using System.Timers;
using System.Diagnostics;//Stopwatch\PerformanceCounternamespace WindowsFormsApplication2
{public partial class NetJiankongForm2 : Form{private MyNetWorkMatchClass[] m_MNWMadapters;private MyNetWorkMonitor monitor;public NetJiankongForm2(){InitializeComponent();}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} }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（需要Monitor的）适配器列表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（需要Monitor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（需要Monitor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);//StartMonitoring方法中开启时钟}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");string[] InstanceNames = PCCCategory.GetInstanceNames();foreach (string InstanceName in InstanceNames){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()//控制适配器开始工作（开启Monitor_Timer时钟）{if(m_AdaptersList.Count > 0)//鲁棒性（防崩溃）{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（开启Monitor_Timer时钟）{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));}}}class MyNetWorkMatchClass{public override string ToString(){return m_strMatchName;}public string strMatchName//"ASIX AX88772C USB2.0 to Fast Ethernet Adapter"或"Intel[R] Ethernet Connection [7] I219-V"{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_lDownLoadSpeed*8/ 1000.0;//理论上应除以1024，但实际除以1000才与性能管理器中所显示吞吐量一致}} public double UploadSpeedKbps{get{return this.m_lUpLoadSpeed*8 /1000.0;//理论上应除以1024，但实际除以1000才与性能管理器中所显示吞吐量一致}}private long m_lDownLoadNetValues1; //当前的下载速度,***字节***计算（须*8变为bit才与性能管理器中所显示吞吐量一致）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（须*8变为bit才与性能管理器中所显示吞吐量一致）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;}}
}

参考

求助：用c#怎么测网卡的吞吐量，急用
C#流量监控源代码
C# 利用性能计数器监控网络状态

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c#利用PerformanceCounter进行网卡流量监控

PerformanceCounter基础知识：

参考

利用PerformanceCounter进行网卡流量监控

参考

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