本例是利用C#中的性能计数器（PerformanceCounter）监控网络的状态。并能够直观的展现出来
涉及到的知识点：
- PerformanceCounter，表示 Windows NT 性能计数器组件。NextValue() 即获取计数器样本并为其返回计算所得值。
- PerformanceCounterCategory 表示性能对象，它定义性能计数器的类别。通过这两个即可得到计数器的信息。
- Chart 图表，VS自带的Chart图表，大大简化了对图表的开发。关于Chart，此前已有例子说明
- Queue 队列表示对象的先进先出集合。关于Queue此前已有例子说明
- TreeView 显示标记项的分层集合，每个标记项用一个 System.Windows.Forms.TreeNode 来表示。即VS自带的树状菜单
- Timer 实现按用户定义的时间间隔引发事件的计时器。此计时器最宜用于 Windows 窗体应用程序中，并且必须在窗口中使用。定时刷新计数器中的值。
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效果图如下：
关于可用的计数器列表【计数器有很多，一级菜单是计数器的类别，二级菜单是计数器InstanceName,三级菜单是计数器名称】，如下图所示：
代码如下：
1 using System;
2 using System.Collections.Generic;
3 using System.ComponentModel;
4 using System.Data;
5 using System.Drawing;
6 using System.Linq;
7 using System.Text;
8 using System.Windows.Forms;
9 using System.Windows.Forms.DataVisualization.Charting;
10 using System.Diagnostics;
11
12 namespace DemoSharp
13 {
14 public partial class NetworkMonitor : Form
15 {
16 private PerformanceCounter mCounter;//当前计数器
17
18 private Queue<double> dataQueue = new Queue<double>(100);//初始化队列
19
20 public NetworkMonitor()
21 {
22 InitializeComponent();
23 InitCounterCategory();
24 InitChart();
25 }
26
27 /// <summary>
28 /// 初始化计数器信息
29 /// </summary>
30 private void InitCounterCategory() {
31 //获取所有的计数器类别
32 var counterCategories = PerformanceCounterCategory.GetCategories().OrderBy(p=>p.CategoryName);
33 int i=0;
34 foreach (var counterCategory in counterCategories) {
35 //属于线程级别的不显示
36 if (counterCategory.CategoryName == "Thread") {
37 continue;
38 }
39 //将信息绑定的TreeView上
40 this.tvCategory.CheckBoxes = true;
41 this.tvCategory.Nodes.Add(counterCategory.CategoryName);
42 string[] instanceNames = counterCategory.GetInstanceNames();
43 int j = 0;
44 foreach (var instanceName in instanceNames) {
45 this.tvCategory.Nodes[i].Nodes.Add(instanceName);
46 var counters = counterCategory.GetCounters(instanceName).Select(p=>string.Format("{0}",p.CounterName));
47 int k = 0;
48 foreach (var counter in counters) {
49 this.tvCategory.Nodes[i].Nodes[j].Nodes.Add(counter);
50 k++;
51 }
52 j++;
53 }
54 i++;
55 }
56 //初始化Counter
57 PerformanceCounterCategory pcCategory = new PerformanceCounterCategory("Network Interface");
58 string[] iNames = pcCategory.GetInstanceNames();
59 PerformanceCounter[] pCounters = pcCategory.GetCounters(iNames[0]);
60 //给网络监控计数器赋值
61 mCounter = pCounters[0];
62 mCounter.NextValue();//初始值
63 }
64
65 //<summary>
66 //初始化图表
67 //</summary>
68 private void InitChart()
69 {
70 //定义图表区域
71 this.chart1.ChartAreas.Clear();
72 ChartArea chartArea1 = new ChartArea("C1");
73 this.chart1.ChartAreas.Add(chartArea1);
74 //定义存储和显示点的容器
75 this.chart1.Series.Clear();
76 Series series1 = new Series("S1");
77 series1.ChartArea = "C1";
78 this.chart1.Series.Add(series1);
79 //设置图表显示样式
80 this.chart1.ChartAreas[0].AxisY.ArrowStyle = AxisArrowStyle.SharpTriangle;
81 this.chart1.ChartAreas[0].AxisY.Title = "Kkbps";//坐标轴的标题
82 this.chart1.ChartAreas[0].AxisY.TextOrientation = TextOrientation.Rotated270;
83 this.chart1.ChartAreas[0].AxisY.Minimum = 0;
84 this.chart1.ChartAreas[0].AxisY.Maximum = 50;
85 this.chart1.ChartAreas[0].AxisY.Interval = 5;
86 this.chart1.ChartAreas[0].AxisX.Interval = 5;
87 this.chart1.ChartAreas[0].AxisX.ArrowStyle = AxisArrowStyle.SharpTriangle;
88 this.chart1.ChartAreas[0].AxisX.Title = "Sec";
89 this.chart1.ChartAreas[0].AxisX.TextOrientation = TextOrientation.Horizontal;
90 this.chart1.ChartAreas[0].AxisX.MajorGrid.LineColor = System.Drawing.Color.Silver;
91 this.chart1.ChartAreas[0].AxisY.MajorGrid.LineColor = System.Drawing.Color.Silver;
92 //设置标题
93 this.chart1.Titles.Clear();
94 this.chart1.Titles.Add("S01");
95 this.chart1.Titles[0].Text = "XXX网络监控显示";
96 this.chart1.Titles[0].ForeColor = Color.RoyalBlue;
97 this.chart1.Titles[0].Font = new System.Drawing.Font("Microsoft Sans Serif", 12F);
98 //设置图表显示样式
99 this.chart1.Series[0].Color = Color.LightGreen;
100 this.chart1.Series[0].ChartType = SeriesChartType.Area;//图表形状
101 this.chart1.Series[0].Points.Clear();
102 }
103
104 /// <summary>
105 /// 启动定时器
106 /// </summary>
107 /// <param name="sender"></param>
108 /// <param name="e"></param>
109 private void btnStart_Click(object sender, EventArgs e)
110 {
111 this.timer1.Start();
112
113 }
114
115 /// <summary>
116 /// 停止定时器
117 /// </summary>
118 /// <param name="sender"></param>
119 /// <param name="e"></param>
120 private void btnStop_Click(object sender, EventArgs e)
121 {
122 this.timer1.Stop();
123 }
124
125 /// <summary>
126 /// 定时执行函数
127 /// </summary>
128 /// <param name="sender"></param>
129 /// <param name="e"></param>
130 private void timer1_Tick(object sender, EventArgs e)
131 {
132 UpdateQueueValue();
133 this.chart1.Series[0].Points.Clear();
134 if (dataQueue.Max() > this.chart1.ChartAreas[0].AxisY.Maximum) {
135 this.chart1.ChartAreas[0].AxisY.Maximum = Math.Ceiling(dataQueue.Max() / 10) * 10;
136 this.chart1.ChartAreas[0].AxisY.Interval = this.chart1.ChartAreas[0].AxisY.Maximum / 10;
137 }
138 for (int i = 0; i < dataQueue.Count; i++)
139 {
140 this.chart1.Series[0].Points.AddXY((i + 1), dataQueue.ElementAt(i));
141 }
142 }
143
144 //更新队列中的值
145 private void UpdateQueueValue()
146 {
147
148 if (dataQueue.Count > 100)
149 {
150 dataQueue.Dequeue();
151 }
152 //获取的值就Byte/s 所以要除以1024
153 dataQueue.Enqueue(mCounter.NextValue() / (1024));
154
155 }
156
157 /// <summary>
158 /// 当选中复选框时发生
159 /// </summary>
160 /// <param name="sender"></param>
161 /// <param name="e"></param>
162 private void tvCategory_AfterCheck(object sender, TreeViewEventArgs e)
163 {
164 bool flag = e.Node.Checked;//取得选中状态，所有子节点的状态保持一致
165 CheckedStated(e.Node.Nodes, flag);
166 }
167
168 /// <summary>
169 /// 采用递归方法修改节点的选中状态
170 /// </summary>
171 /// <param name="nodes"></param>
172 /// <param name="flag"></param>
173 private void CheckedStated(TreeNodeCollection nodes,bool flag) {
174
175 if (nodes != null)
176 {
177 foreach (TreeNode node in nodes)
178 {
179 node.Checked = flag;
180 CheckedStated(node.Nodes, flag);
181 }
182 }
183 }
184 }
185 }
备注：性能计数器类别获取出现异常的解决方案：
在CMD命令窗口中，执行 LODCTR /R 重置性能计数器。如下图所示：
如果依然不行，尝试以管理员身份运行【勾上】，如下图所示：
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时间： 2024-08-07 21:19:56