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测试数据ponentmodel;
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：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
dy("nrwz");