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C#利用性能计数器监控网络状态的教程

时间:2022-06-25 07:58:44 编辑:袖梨 来源:一聚教程网

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:

 
 代码如下 复制代码
usingSystem;
usingSystem.Collections.Generic;
usingSystem.ComponentModel;
usingSystem.Data;
usingSystem.Drawing;
usingSystem.Linq;
usingSystem.Text;
usingSystem.Windows.Forms;
usingSystem.Windows.Forms.DataVisualization.Charting;
usingSystem.Diagnostics;
 
namespaceDemoSharp
{
  publicpartialclassNetworkMonitor : Form
  {
    privatePerformanceCounter mCounter;//当前计数器
 
    privateQueue dataQueue =newQueue(100);//初始化队列
 
    publicNetworkMonitor()
    {
      InitializeComponent();
      InitCounterCategory();
      InitChart();
    }
 
    ///
    /// 初始化计数器信息
    ///
    privatevoidInitCounterCategory() {
      //获取所有的计数器类别
      var counterCategories = PerformanceCounterCategory.GetCategories().OrderBy(p=>p.CategoryName);
      inti=0;
      foreach(var counterCategoryincounterCategories) {
        //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();
        intj = 0;
        foreach(var instanceNameininstanceNames) {
          this.tvCategory.Nodes[i].Nodes.Add(instanceName);
          var counters = counterCategory.GetCounters(instanceName).Select(p=>string.Format("{0}",p.CounterName));
          intk = 0;
          foreach(var counterincounters) {
            this.tvCategory.Nodes[i].Nodes[j].Nodes.Add(counter);
            k++;
          }
          j++;
        }
        i++;
      }
      //初始化Counter
      PerformanceCounterCategory pcCategory =newPerformanceCounterCategory("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
    }
 
     //
     //初始化图表
     //
    privatevoidInitChart()
    {
      //定义图表区域
      this.chart1.ChartAreas.Clear();
      ChartArea chartArea1 =newChartArea("C1");
      this.chart1.ChartAreas.Add(chartArea1);
      //定义存储和显示点的容器
      this.chart1.Series.Clear();
      Series series1 =newSeries("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 =newSystem.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();
    }
 
    ///
    /// 启动定时器
    ///
    ///
    ///
    privatevoidbtnStart_Click(objectsender, EventArgs e)
    {
      this.timer1.Start();
       
    }
 
    ///
    /// 停止定时器
    ///
    ///
    ///
    privatevoidbtnStop_Click(objectsender, EventArgs e)
    {
      this.timer1.Stop();
    }
 
    ///
    /// 定时执行函数
    ///
    ///
    ///
    privatevoidtimer1_Tick(objectsender, 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(inti = 0; i < dataQueue.Count; i++)
      {
        this.chart1.Series[0].Points.AddXY((i + 1), dataQueue.ElementAt(i));
      }
    }
 
     //更新队列中的值
    privatevoidUpdateQueueValue()
    {
 
      if(dataQueue.Count > 100)
      {
        dataQueue.Dequeue();
      }
      //获取的值就Byte/s 所以要除以1024
      dataQueue.Enqueue(mCounter.NextValue() / (1024));
 
    }
 
    ///
    /// 当选中复选框时发生
    ///
    ///
    ///
    privatevoidtvCategory_AfterCheck(objectsender, TreeViewEventArgs e)
    {
      boolflag = 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);
    }
 
    ///
    /// 采用递归方法修改节点的选中状态
    ///
    ///
    ///
    privatevoidCheckedStated(TreeNodeCollection nodes,boolflag) {
       
      if(nodes !=null)
      {
        foreach(TreeNode nodeinnodes)
        {
          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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