C# 利用性能计数器监控网络状态

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。本文仅供学习分享使用，如有不足之处，还请指正。

涉及知识点：

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。

效果图

如下图所示：

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 }

View Code

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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