本例是利用c#中的性能計(jì)數(shù)器（performancecounter）監(jiān)控網(wǎng)絡(luò)的狀態(tài)。并能夠直觀的展現(xiàn)出來
涉及到的知識(shí)點(diǎn)：
performancecounter，表示 windows nt 性能計(jì)數(shù)器組件。nextvalue() 即獲取計(jì)數(shù)器樣本并為其返回計(jì)算所得值。performancecountercategory 表示性能對(duì)象，它定義性能計(jì)數(shù)器的類別。通過這兩個(gè)即可得到計(jì)數(shù)器的信息。
chart 圖表，vs自帶的chart圖表，大大簡(jiǎn)化了對(duì)圖表的開發(fā)。關(guān)于chart，此前已有例子說明。
queue 隊(duì)列表示對(duì)象的先進(jìn)先出集合。關(guān)于queue此前已有例子說明。
treeview 顯示標(biāo)記項(xiàng)的分層集合，每個(gè)標(biāo)記項(xiàng)用一個(gè) system.windows.forms.treenode 來表示。即vs自帶的樹狀菜單
timer 實(shí)現(xiàn)按用戶定義的時(shí)間間隔引發(fā)事件的計(jì)時(shí)器。此計(jì)時(shí)器最宜用于 windows 窗體應(yīng)用程序中，并且必須在窗口中使用。定時(shí)刷新計(jì)數(shù)器中的值。
效果圖如下：
關(guān)于可用的計(jì)數(shù)器列表【計(jì)數(shù)器有很多，一級(jí)菜單是計(jì)數(shù)器的類別，二級(jí)菜單是計(jì)數(shù)器instancename,三級(jí)菜單是計(jì)數(shù)器名稱】，如下圖所示：
代碼如下：
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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;//當(dāng)前計(jì)數(shù)器 private queue<double> dataqueue = new queue<double>(100);//初始化隊(duì)列 public networkmonitor() { initializecomponent(); initcountercategory(); initchart(); } /// <summary> /// 初始化計(jì)數(shù)器信息 /// </summary> private void initcountercategory() { //獲取所有的計(jì)數(shù)器類別 var countercategories = performancecountercategory.getcategories().orderby(p=>p.categoryname); int i=0; foreach (var countercategory in countercategories) { //屬于線程級(jí)別的不顯示 if (countercategory.categoryname == "thread") { continue; } //將信息綁定的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]); //給網(wǎng)絡(luò)監(jiān)控計(jì)數(shù)器賦值 mcounter = pcounters[0]; mcounter.nextvalue();//初始值 } //<summary> //初始化圖表 //</summary> private void initchart() { //定義圖表區(qū)域 this.chart1.chartareas.clear(); chartarea chartarea1 = new chartarea("c1"); this.chart1.chartareas.add(chartarea1); //定義存儲(chǔ)和顯示點(diǎn)的容器 this.chart1.series.clear(); series series1 = new series("s1"); series1.chartarea = "c1"; this.chart1.series.add(series1); //設(shè)置圖表顯示樣式 this.chart1.chartareas[0].axisy.arrowstyle = axisarrowstyle.sharptriangle; this.chart1.chartareas[0].axisy.title = "kkbps";//坐標(biāo)軸的標(biāo)題 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; //設(shè)置標(biāo)題 this.chart1.titles.clear(); this.chart1.titles.add("s01"); this.chart1.titles[0].text = "xxx網(wǎng)絡(luò)監(jiān)控顯示"; this.chart1.titles[0].forecolor = color.royalblue; this.chart1.titles[0].font = new system.drawing.font("microsoft sans serif", 12f); //設(shè)置圖表顯示樣式 this.chart1.series[0].color = color.lightgreen; this.chart1.series[0].charttype = seriescharttype.area;//圖表形狀 this.chart1.series[0].points.clear(); } /// <summary> /// 啟動(dòng)定時(shí)器 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnstart_click(object sender, eventargs e) { this.timer1.start(); } /// <summary> /// 停止定時(shí)器 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnstop_click(object sender, eventargs e) { this.timer1.stop(); } /// <summary> /// 定時(shí)執(zhí)行函數(shù) /// </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)); } } //更新隊(duì)列中的值 private void updatequeuevalue() { if (dataqueue.count > 100) { dataqueue.dequeue(); } //獲取的值就byte/s 所以要除以1024 dataqueue.enqueue(mcounter.nextvalue() / (1024)); } /// <summary> /// 當(dāng)選中復(fù)選框時(shí)發(fā)生 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void tvcategory_aftercheck(object sender, treevieweventargs e) { bool flag = e.node.checked;//取得選中狀態(tài)，所有子節(jié)點(diǎn)的狀態(tài)保持一致 checkedstated(e.node.nodes, flag); } /// <summary> /// 采用遞歸方法修改節(jié)點(diǎn)的選中狀態(tài) /// </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); } } } }} |
備注：性能計(jì)數(shù)器類別獲取出現(xiàn)異常的解決方案：
在cmd命令窗口中，執(zhí)行 lodctr /r 重置性能計(jì)數(shù)器。如下圖所示：
如果依然不行，嘗試以管理員身份運(yùn)行【勾上】，如下圖所示：
以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持服務(wù)器之家。
