C#网速监测

主要有两个类，其一是NetworkAdapter，该类的作用是获取本机网络适配器列表，并且可以通过该类的属性获取当前网速数据；其二是NetworkMonitor，该类是通过.NET的PerformanceCounter（性能计数器组件）监测本机每一个网络适配器对应的当前网速状况（翻译得不大好，具体还是看原汁原味的代码吧:)）

NetworkAdapter类

using System; using System.Diagnostics; namespace NetWorkSpeedMonitor { /// <summary> /// Represents a network adapter installed on the machine. /// Properties of this class can be used to obtain current network speed. /// </summary> public class NetworkAdapter { /// <summary> /// Instances of this class are supposed to be created only in an NetworkMonitor. /// </summary> internal NetworkAdapter(string name) { this.name = name; } private long dlSpeed, ulSpeed; // Download/Upload speed in bytes per second. private long dlValue, ulValue; // Download/Upload counter value in bytes. private long dlValueOld, ulValueOld; // Download/Upload counter value one second earlier, in bytes. internal string name; // The name of the adapter. internal PerformanceCounter dlCounter, ulCounter; // Performance counters to monitor download and upload speed. /// <summary> /// Preparations for monitoring. /// </summary> internal void init() { // Since dlValueOld and ulValueOld are used in method refresh() to calculate network speed, they must have be initialized. this.dlValueOld = this.dlCounter.NextSample().RawValue; this.ulValueOld = this.ulCounter.NextSample().RawValue; } /// <summary> /// Obtain new sample from performance counters, and refresh the values saved in dlSpeed, ulSpeed, etc. /// This method is supposed to be called only in NetworkMonitor, one time every second. /// </summary> internal void refresh() { this.dlValue = this.dlCounter.NextSample().RawValue; this.ulValue = this.ulCounter.NextSample().RawValue; // Calculates download and upload speed. this.dlSpeed = this.dlValue - this.dlValueOld; this.ulSpeed = this.ulValue - this.ulValueOld; this.dlValueOld = this.dlValue; this.ulValueOld = this.ulValue; } /// <summary> /// Overrides method to return the name of the adapter. /// </summary> /// <returns>The name of the adapter.</returns> public override string ToString() { return this.name; } /// <summary> /// The name of the network adapter. /// </summary> public string Name { get { return this.name; } } /// <summary> /// Current download speed in bytes per second. /// </summary> public long DownloadSpeed { get { return this.dlSpeed; } } /// <summary> /// Current upload speed in bytes per second. /// </summary> public long UploadSpeed { get { return this.ulSpeed; } } /// <summary> /// Current download speed in kbytes per second. /// </summary> public double DownloadSpeedKbps { get { return this.dlSpeed / 1024.0; } } /// <summary> /// Current upload speed in kbytes per second. /// </summary> public double UploadSpeedKbps { get { return this.ulSpeed / 1024.0; } } } }

NetworkMonitor类

using System; using System.Timers; using System.Collections; using System.Diagnostics; namespace NetWorkSpeedMonitor { /// <summary> /// The NetworkMonitor class monitors network speed for each network adapter on the computer, /// using classes for Performance counter in .NET library. /// </summary> public class NetworkMonitor { private Timer timer; // The timer event executes every second to refresh the values in adapters. private ArrayList adapters; // The list of adapters on the computer. private ArrayList monitoredAdapters;// The list of currently monitored adapters. public NetworkMonitor() { this.adapters = new ArrayList(); this.monitoredAdapters = new ArrayList(); EnumerateNetworkAdapters(); timer = new Timer(1000); timer.Elapsed += new ElapsedEventHandler(timer_Elapsed); } /// <summary> /// Enumerates network adapters installed on the computer. /// </summary> private void EnumerateNetworkAdapters() { PerformanceCounterCategory category = new PerformanceCounterCategory("Network Interface"); foreach (string name in category.GetInstanceNames()) { // This one exists on every computer. if (name == "MS TCP Loopback interface") continue; // Create an instance of NetworkAdapter class, and create performance counters for it. NetworkAdapter adapter = new NetworkAdapter(name); adapter.dlCounter = new PerformanceCounter("Network Interface", "Bytes Received/sec", name); adapter.ulCounter = new PerformanceCounter("Network Interface", "Bytes Sent/sec", name); this.adapters.Add(adapter); // Add it to ArrayList adapter } } private void timer_Elapsed(object sender, ElapsedEventArgs e) { foreach (NetworkAdapter adapter in this.monitoredAdapters) adapter.refresh(); } /// <summary> /// Get instances of NetworkAdapter for installed adapters on this computer. /// </summary> public NetworkAdapter[] Adapters { get { return (NetworkAdapter[])this.adapters.ToArray(typeof(NetworkAdapter)); } } /// <summary> /// Enable the timer and add all adapters to the monitoredAdapters list, /// unless the adapters list is empty. /// </summary> public void StartMonitoring() { if (this.adapters.Count > 0) { foreach (NetworkAdapter adapter in this.adapters) if (!this.monitoredAdapters.Contains(adapter)) { this.monitoredAdapters.Add(adapter); adapter.init(); } timer.Enabled = true; } } /// <summary> /// Enable the timer, and add the specified adapter to the monitoredAdapters list /// </summary> public void StartMonitoring(NetworkAdapter adapter) { if (!this.monitoredAdapters.Contains(adapter)) { this.monitoredAdapters.Add(adapter); adapter.init(); } timer.Enabled = true; } /// <summary> /// Disable the timer, and clear the monitoredAdapters list. /// </summary> public void StopMonitoring() { this.monitoredAdapters.Clear(); timer.Enabled = false; } /// <summary> /// Remove the specified adapter from the monitoredAdapters list, and /// disable the timer if the monitoredAdapters list is empty. /// </summary> public void StopMonitoring(NetworkAdapter adapter) { if (this.monitoredAdapters.Contains(adapter)) this.monitoredAdapters.Remove(adapter); if (this.monitoredAdapters.Count == 0) timer.Enabled = false; } } }

Form关键代码

using NetWorkSpeedMonitor; private NetworkAdapter[] adapters; private NetworkMonitor monitor; private void FormMain_Load(object sender, System.EventArgs e) { monitor = new NetworkMonitor(); this.adapters = monitor.Adapters; /* If the length of adapters is zero, then no instance * exists in the networking category of performance console.*/ if (adapters.Length == 0) { this.ListAdapters.Enabled = false; MessageBox.Show("No network adapters found on this computer."); return; } this.ListAdapters.Items.AddRange(this.adapters); } private void ListAdapters_SelectedIndexChanged(object sender, System.EventArgs e) { monitor.StopMonitoring(); // Start a timer to obtain new performance counter sample every second. monitor.StartMonitoring(adapters[this.ListAdapters.SelectedIndex]); this.TimerCounter.Start(); } private void TimerCounter_Tick(object sender, System.EventArgs e) { NetworkAdapter adapter = this.adapters[this.ListAdapters.SelectedIndex]; /* The DownloadSpeedKbps and UploadSpeedKbps are double values. You can also * use properties DownloadSpeed and UploadSpeed, which are long values but * are measured in bytes per second. */ this.LableDownloadValue.Text = String.Format("{0:n} kbps", adapter.DownloadSpeedKbps); this.LabelUploadValue.Text = String.Format("{0:n} kbps", adapter.UploadSpeedKbps); }

运行效果：

 

原文地址：http://www.codeproject.com/KB/system/networkmonitorl.aspx