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:
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:
核心代码
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 }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:
出处:https://www.cnblogs.com/hsiang/p/6258145.html