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：
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>();//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=;
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 = ;
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 = ;
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[]);
//给网络监控计数器赋值
mCounter = pCounters[];
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[].AxisY.ArrowStyle = AxisArrowStyle.SharpTriangle;
this.chart1.ChartAreas[].AxisY.Title = "Kkbps";//坐标轴的标题
this.chart1.ChartAreas[].AxisY.TextOrientation = TextOrientation.Rotated270;
this.chart1.ChartAreas[].AxisY.Minimum = ;
this.chart1.ChartAreas[].AxisY.Maximum = ;
this.chart1.ChartAreas[].AxisY.Interval = ;
this.chart1.ChartAreas[].AxisX.Interval = ;
this.chart1.ChartAreas[].AxisX.ArrowStyle = AxisArrowStyle.SharpTriangle;
this.chart1.ChartAreas[].AxisX.Title = "Sec";
this.chart1.ChartAreas[].AxisX.TextOrientation = TextOrientation.Horizontal;
this.chart1.ChartAreas[].AxisX.MajorGrid.LineColor = System.Drawing.Color.Silver;
this.chart1.ChartAreas[].AxisY.MajorGrid.LineColor = System.Drawing.Color.Silver;
//设置标题
this.chart1.Titles.Clear();
this.chart1.Titles.Add("S01");
this.chart1.Titles[].Text = "XXX网络监控显示";
this.chart1.Titles[].ForeColor = Color.RoyalBlue;
this.chart1.Titles[].Font = new System.Drawing.Font("Microsoft Sans Serif", 12F);
//设置图表显示样式
this.chart1.Series[].Color = Color.LightGreen;
this.chart1.Series[].ChartType = SeriesChartType.Area;//图表形状
this.chart1.Series[].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[].Points.Clear();
if (dataQueue.Max() > this.chart1.ChartAreas[].AxisY.Maximum) {
this.chart1.ChartAreas[].AxisY.Maximum = Math.Ceiling(dataQueue.Max() / ) * ;
this.chart1.ChartAreas[].AxisY.Interval = this.chart1.ChartAreas[].AxisY.Maximum / ;
}
for (int i = ; i < dataQueue.Count; i++)
{
this.chart1.Series[].Points.AddXY((i + ), dataQueue.ElementAt(i));
}
} //更新队列中的值
private void UpdateQueueValue()
{ if (dataQueue.Count > )
{
dataQueue.Dequeue();
}
//获取的值就Byte/s 所以要除以1024
dataQueue.Enqueue(mCounter.NextValue() / ()); } /// <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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