計算出你頁面執行的時間 ASP.NET

本文將敘述如何計算出ASP.NET頁面執行所需要的時間，當項目較大的時候有時候可能出現一些莫明其妙的錯誤，這可能是效能上的瓶頸或者是某些BUG引發的（比如<img src="" />，會引起兩次訪問你的服務資源），這時我們需要計算出每個時間執行的時間以便排查出引發項目出現效能異常的頁面。

 

第一步：建立所有頁面的基類

PageBase.cs

using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Collections.Generic;using System.Text;using System.IO;/// <summary>/// PageBase 的摘要說明/// </summary>public class PageBase : Page{public PageBase(){//// TODO: 在此處添加建構函式邏輯//}#region Overridenprotected override void OnInit(EventArgs e){base.OnInit(e);//計算時間執行時間if (this.MeasureExecutionTime){watch = new System.Diagnostics.Stopwatch();watch.Start();this.RecordTimeStamp("頁面開始執行……");}}protected override void OnLoad(EventArgs e){base.OnLoad(e);}protected override void OnPreRenderComplete(EventArgs e){base.OnPreRenderComplete(e);if (this.MeasureExecutionTime){this.RecordTimeStamp("Page execution complete...");watch.Stop();Control addExecutionTo = this.Form;if (addExecutionTo == null)addExecutionTo = this;addExecutionTo.Controls.Add(new LiteralControl("<br /><br />"));StringBuilder timestampsOutput = new StringBuilder(50 * this.ExcutionTimeStamps.Count);for (int i = 0; i < this.ExcutionTimeStamps.Count; i++)timestampsOutput.AppendFormat("<b>Timestamp {0}</b>: {1:N0} ms ({2})<br />{3}",i + 1, this.ExcutionTimeStamps[i].TimeStamp,this.ExcutionTimeStamps[i].Description, Environment.NewLine);addExecutionTo.Controls.Add(new LiteralControl(timestampsOutput.ToString()));}}#endregion#region Members#endregion#region FindControlRecursive  迭代尋找控制項protected virtual Control FindControlRecursive(string id){return FindControlRecursive(id, this);}/// <summary>/// 迭代尋找控制項/// </summary>/// <param name="id">尋找控制項的編號</param>/// <param name="parent">控制項容器</param>/// <returns>Control</returns>protected virtual Control FindControlRecursive(string id, Control parent){// if parent is the control we're looking for, return itif (string.Compare(parent.ID, id, true) == 0)return parent;//search through childrenforeach (Control child in parent.Controls){Control match = FindControlRecursive(id, child);if (match != null)return match;}//if we reach here then no control width id was found.return null;}#endregion#region ExecutionTime 執行時間/// <summary>/// 是否開啟計算頁面計算時間/// </summary>public virtual bool MeasureExecutionTime{get {object o = ViewState["MeasureExecutionTime"];return o == null ? false : (bool)o;}set {ViewState["MeasureExecutionTime"] = value;}}private System.Diagnostics.Stopwatch watch = null;private List<TimeStampInfo> timeStamps = null;/// <summary>/// 頁面執行時間集合/// </summary>protected virtual List<TimeStampInfo> ExcutionTimeStamps{get {if (timeStamps == null)timeStamps = new List<TimeStampInfo>();return timeStamps;}}/// <summary>/// 記錄頁面執行時間/// </summary>/// <param name="desc"></param>protected virtual void RecordTimeStamp(string desc){if (watch == null)throw new ArgumentException("要記錄頁面的執行時間 MeasureExecutionTime 必須設定為 true.");ExcutionTimeStamps.Add(new TimeStampInfo(watch.ElapsedMilliseconds,desc));}#endregion}

首先用一個變數MeasureExecutionTime來儲存頁面是否需要計算出執行的時間，然後重寫頁面的OnInit事件 ，當需要計算頁面執行的時間則啟動Stopwatch。

最後在OnPreRenderComplete中輸出計算的結果。

第二步：建立需要計算頁面執行時間的頁面

其頁面的測試如下：

Default.aspx.cs

using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;public partial class _Default :PageBase{protected void Page_Init(object sender, EventArgs e){base.MeasureExecutionTime = true;}protected void Page_Load(object sender, EventArgs e){// Record timestampbase.RecordTimeStamp("Starting long running process");// Do long running processRandom rnd = new Random();System.Threading.Thread.Sleep(rnd.Next(1000) + 1000);if (!IsPostBack){DataTable dt = new DataTable();dt.Columns.Add("ID");dt.Columns.Add("Name");for (int i = 0; i < 20; i++){DataRow dr = dt.NewRow();dr["ID"] = i;dr["Name"] = "Name" + i.ToString();dt.Rows.Add(dr);dt.AcceptChanges();}gv.DataSource = dt;gv.DataBind();}// Record timestampbase.RecordTimeStamp("Completed long running process");}}