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。
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:
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;//当前计数器 private Queue<double> dataQueue = new Queue<double>(100);//初始化队列 public NetworkMonitor() { InitializeComponent(); InitCounterCategory(); InitChart(); } /// <summary> /// 初始化计数器信息 /// </summary> private void InitCounterCategory() { //获取所有的计数器类别 var counterCategories = PerformanceCounterCategory.GetCategories().OrderBy(p=>p.CategoryName); int i=0; foreach (var counterCategory in counterCategories) { //属于线程级别的不显示 if (counterCategory.CategoryName == "Thread") { continue; } //将信息绑定的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]); //给网络监控计数器赋值 mCounter = pCounters[0]; mCounter.NextValue();//初始值 } //<summary> //初始化图表 //</summary> private void InitChart() { //定义图表区域 this.chart1.ChartAreas.Clear(); ChartArea chartArea1 = new ChartArea("C1"); this.chart1.ChartAreas.Add(chartArea1); //定义存储和显示点的容器 this.chart1.Series.Clear(); Series series1 = new Series("S1"); series1.ChartArea = "C1"; this.chart1.Series.Add(series1); //设置图表显示样式 this.chart1.ChartAreas[0].AxisY.ArrowStyle = AxisArrowStyle.SharpTriangle; this.chart1.ChartAreas[0].AxisY.Title = "Kkbps";//坐标轴的标题 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; //设置标题 this.chart1.Titles.Clear(); this.chart1.Titles.Add("S01"); this.chart1.Titles[0].Text = "XXX网络监控显示"; this.chart1.Titles[0].ForeColor = Color.RoyalBlue; this.chart1.Titles[0].Font = new System.Drawing.Font("Microsoft Sans Serif", 12F); //设置图表显示样式 this.chart1.Series[0].Color = Color.LightGreen; this.chart1.Series[0].ChartType = SeriesChartType.Area;//图表形状 this.chart1.Series[0].Points.Clear(); } /// <summary> /// 启动定时器 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnStart_Click(object sender, EventArgs e) { this.timer1.Start(); } /// <summary> /// 停止定时器 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnStop_Click(object sender, EventArgs e) { this.timer1.Stop(); } /// <summary> /// 定时执行函数 /// </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)); } } //更新队列中的值 private void UpdateQueueValue() { if (dataQueue.Count > 100) { dataQueue.Dequeue(); } //获取的值就Byte/s 所以要除以1024 dataQueue.Enqueue(mCounter.NextValue() / (1024)); } /// <summary> /// 当选中复选框时发生 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void tvCategory_AfterCheck(object sender, TreeViewEventArgs e) { bool flag = e.Node.Checked;//取得选中状态,所有子节点的状态保持一致 CheckedStated(e.Node.Nodes, flag); } /// <summary> /// 采用递归方法修改节点的选中状态 /// </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); } } } } }
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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