本例是利用C#中的性能計數器（PerformanceCounter）監控網絡的狀態。并能夠直觀的展現出來
涉及到的知識點：
PerformanceCounter，表示 Windows NT 性能計數器組件。NextValue() 即獲取計數器樣本并為其返回計算所得值。PerformanceCounterCategory 表示性能對象，它定義性能計數器的類別。通過這兩個即可得到計數器的信息。
Chart 圖表，VS自帶的Chart圖表，大大簡化了對圖表的開發。關于Chart，此前已有例子說明。
Queue 隊列表示對象的先進先出集合。關于Queue此前已有例子說明。
TreeView 顯示標記項的分層集合，每個標記項用一個 System.Windows.Forms.TreeNode 來表示。即VS自帶的樹狀菜單
Timer 實現按用戶定義的時間間隔引發事件的計時器。此計時器最宜用于 Windows 窗體應用程序中，并且必須在窗口中使用。定時刷新計數器中的值。
效果圖如下：
關于可用的計數器列表【計數器有很多，一級菜單是計數器的類別，二級菜單是計數器InstanceName,三級菜單是計數器名稱】，如下圖所示：
代碼如下：
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Windows.Forms.DataVisualization.Charting;using System.Diagnostics;namespace DemoSharp{ public partial class NetworkMonitor : Form { private PerformanceCounter mCounter;//當前計數器 private Queue<double> dataQueue = new Queue<double>(100);//初始化隊列 public NetworkMonitor() { InitializeComponent(); InitCounterCategory(); InitChart(); } /// <summary> /// 初始化計數器信息 /// </summary> private void InitCounterCategory() { //獲取所有的計數器類別 var counterCategories = PerformanceCounterCategory.GetCategories().OrderBy(p=>p.CategoryName); int i=0; foreach (var counterCategory in counterCategories) { //屬于線程級別的不顯示 if (counterCategory.CategoryName == "Thread") { continue; } //將信息綁定的TreeView上 this.tvCategory.CheckBoxes = true; this.tvCategory.Nodes.Add(counterCategory.CategoryName); string[] instanceNames = counterCategory.GetInstanceNames(); int j = 0; foreach (var instanceName in instanceNames) { this.tvCategory.Nodes[i].Nodes.Add(instanceName); var counters = counterCategory.GetCounters(instanceName).Select(p=>string.Format("{0}",p.CounterName)); int k = 0; foreach (var counter in counters) { this.tvCategory.Nodes[i].Nodes[j].Nodes.Add(counter); k++; } j++; } i++; } //初始化Counter PerformanceCounterCategory pcCategory = new PerformanceCounterCategory("Network Interface"); string[] iNames = pcCategory.GetInstanceNames(); PerformanceCounter[] pCounters = pcCategory.GetCounters(iNames[0]); //給網絡監控計數器賦值 mCounter = pCounters[0]; mCounter.NextValue();//初始值 } //<summary> //初始化圖表 //</summary> private void InitChart() { //定義圖表區域 this.chart1.ChartAreas.Clear(); ChartArea chartArea1 = new ChartArea("C1"); this.chart1.ChartAreas.Add(chartArea1); //定義存儲和顯示點的容器 this.chart1.Series.Clear(); Series series1 = new Series("S1"); series1.ChartArea = "C1"; this.chart1.Series.Add(series1); //設置圖表顯示樣式 this.chart1.ChartAreas[0].AxisY.ArrowStyle = AxisArrowStyle.SharpTriangle; this.chart1.ChartAreas[0].AxisY.Title = "Kkbps";//坐標軸的標題 this.chart1.ChartAreas[0].AxisY.TextOrientation = TextOrientation.Rotated270; this.chart1.ChartAreas[0].AxisY.Minimum = 0; this.chart1.ChartAreas[0].AxisY.Maximum = 50; this.chart1.ChartAreas[0].AxisY.Interval = 5; this.chart1.ChartAreas[0].AxisX.Interval = 5; this.chart1.ChartAreas[0].AxisX.ArrowStyle = AxisArrowStyle.SharpTriangle; this.chart1.ChartAreas[0].AxisX.Title = "Sec"; this.chart1.ChartAreas[0].AxisX.TextOrientation = TextOrientation.Horizontal; this.chart1.ChartAreas[0].AxisX.MajorGrid.LineColor = System.Drawing.Color.Silver; this.chart1.ChartAreas[0].AxisY.MajorGrid.LineColor = System.Drawing.Color.Silver; //設置標題 this.chart1.Titles.Clear(); this.chart1.Titles.Add("S01"); this.chart1.Titles[0].Text = "XXX網絡監控顯示"; this.chart1.Titles[0].ForeColor = Color.RoyalBlue; this.chart1.Titles[0].Font = new System.Drawing.Font("Microsoft Sans Serif", 12F); //設置圖表顯示樣式 this.chart1.Series[0].Color = Color.LightGreen; this.chart1.Series[0].ChartType = SeriesChartType.Area;//圖表形狀 this.chart1.Series[0].Points.Clear(); } /// <summary> /// 啟動定時器 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnStart_Click(object sender, EventArgs e) { this.timer1.Start(); } /// <summary> /// 停止定時器 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnStop_Click(object sender, EventArgs e) { this.timer1.Stop(); } /// <summary> /// 定時執行函數 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void timer1_Tick(object sender, EventArgs e) { UpdateQueueValue(); this.chart1.Series[0].Points.Clear(); if (dataQueue.Max() > this.chart1.ChartAreas[0].AxisY.Maximum) { this.chart1.ChartAreas[0].AxisY.Maximum = Math.Ceiling(dataQueue.Max() / 10) * 10; this.chart1.ChartAreas[0].AxisY.Interval = this.chart1.ChartAreas[0].AxisY.Maximum / 10; } for (int i = 0; i < dataQueue.Count; i++) { this.chart1.Series[0].Points.AddXY((i + 1), dataQueue.ElementAt(i)); } } //更新隊列中的值 private void UpdateQueueValue() { if (dataQueue.Count > 100) { dataQueue.Dequeue(); } //獲取的值就Byte/s 所以要除以1024 dataQueue.Enqueue(mCounter.NextValue() / (1024)); } /// <summary> /// 當選中復選框時發生 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void tvCategory_AfterCheck(object sender, TreeViewEventArgs e) { bool flag = e.Node.Checked;//取得選中狀態，所有子節點的狀態保持一致 CheckedStated(e.Node.Nodes, flag); } /// <summary> /// 采用遞歸方法修改節點的選中狀態 /// </summary> /// <param name="nodes"></param> /// <param name="flag"></param> private void CheckedStated(TreeNodeCollection nodes,bool flag) { if (nodes != null) { foreach (TreeNode node in nodes) { node.Checked = flag; CheckedStated(node.Nodes, flag); } } } }}備注：性能計數器類別獲取出現異常的解決方案：
在CMD命令窗口中，執行 LODCTR /R 重置性能計數器。如下圖所示：
如果依然不行，嘗試以管理員身份運行【勾上】，如下圖所示：
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VEVB武林網。
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