本例是利用c#中的性能計數器（performancecounter）監控網絡的狀態。并能夠直觀的展現出來
涉及到的知識點：
performancecounter，表示 windows nt 性能計數器組件。nextvalue() 即獲取計數器樣本并為其返回計算所得值。performancecountercategory 表示性能對象，它定義性能計數器的類別。通過這兩個即可得到計數器的信息。
chart 圖表，vs自帶的chart圖表，大大簡化了對圖表的開發。關于chart，此前已有例子說明。
queue 隊列表示對象的先進先出集合。關于queue此前已有例子說明。
treeview 顯示標記項的分層集合，每個標記項用一個 system.windows.forms.treenode 來表示。即vs自帶的樹狀菜單
timer 實現按用戶定義的時間間隔引發事件的計時器。此計時器最宜用于 windows 窗體應用程序中，并且必須在窗口中使用。定時刷新計數器中的值。
效果圖如下：
關于可用的計數器列表【計數器有很多，一級菜單是計數器的類別，二級菜單是計數器instancename,三級菜單是計數器名稱】，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;//當前計數器 private queue<double> dataqueue = new queue<double>(100);//初始化隊列 public networkmonitor() { initializecomponent(); initcountercategory(); initchart(); } /// <summary> /// 初始化計數器信息 /// </summary> private void initcountercategory() { //獲取所有的計數器類別 var countercategories = performancecountercategory.getcategories().orderby(p=>p.categoryname); int i=0; foreach (var countercategory in countercategories) { //屬于線程級別的不顯示 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]); //給網絡監控計數器賦值 mcounter = pcounters[0]; mcounter.nextvalue();//初始值 } //<summary> //初始化圖表 //</summary> private void initchart() { //定義圖表區域 this.chart1.chartareas.clear(); chartarea chartarea1 = new chartarea("c1"); this.chart1.chartareas.add(chartarea1); //定義存儲和顯示點的容器 this.chart1.series.clear(); series series1 = new series("s1"); series1.chartarea = "c1"; this.chart1.series.add(series1); //設置圖表顯示樣式 this.chart1.chartareas[0].axisy.arrowstyle = axisarrowstyle.sharptriangle; this.chart1.chartareas[0].axisy.title = "kkbps";//坐標軸的標題 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; //設置標題 this.chart1.titles.clear(); this.chart1.titles.add("s01"); this.chart1.titles[0].text = "xxx網絡監控顯示"; this.chart1.titles[0].forecolor = color.royalblue; this.chart1.titles[0].font = new system.drawing.font("microsoft sans serif", 12f); //設置圖表顯示樣式 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> /// 啟動定時器 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnstart_click(object sender, eventargs e) { this.timer1.start(); } /// <summary> /// 停止定時器 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnstop_click(object sender, eventargs e) { this.timer1.stop(); } /// <summary> /// 定時執行函數 /// </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> /// 當選中復選框時發生 /// </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，所有子節點的狀態保持一致 checkedstated(e.node.nodes, flag); } /// <summary> /// 采用遞歸方法修改節點的選中狀態 /// </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：性能計數器類別獲取出現異常的解決方案：
在cmd命令窗口中，執行 lodctr /r 重置性能計數器。如下圖所示：
如果依然不行，嘗試以管理員身份運行【勾上】，如下圖所示：
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
