ASP.NET页面运行时候，页面将经历一个生命周期，在生命周期中将执行一系列的处理步骤。包括初始化、实例化控件、还原和维护状态、运行时间处理程序代码以及进行呈现。熟悉页面生命周期非常重要，这样我们才能在生命周期的合适阶段编写代码。如果我们能在写代码的时候想着我们现在是在做生命周期的哪一步那将是非常好的。
你可能会说我不清楚还不是一样写代码，反正每次都在Page_load里面写代码 然后页面就出来了我管那么多干什么。所谓知其然如果能知其所以然岂不是更吊？我个人认为做ASP.NET B/S开发只要咱们熟悉ASP.NET页面生命周期，熟悉“请求-处理-响应“模式，对于一时半儿没有触及到的细节，等真正遇到那个点再去理解它也是毫不费力的。
在开始的时候我们先思考几个问题，看看我们在描述完页面生命周期的时候，能不能回答上这几个问题
1.为什么在服务器端能通过this.textbox1.Text获取到用户提交过来的数据？
2.在Page_Load中Response.Write("hello")查看生成的html代码原文件，hello在哪里？为什么？
3.有一个服务器端的按钮，设置了点击事件，该点击事件什么时候执行？是先执行Page_Load事件还是先执行点击事件？
4.为什么在服务器端通过this.textbox1.Text设置值后，客户端就能显示出来？
看过我上一篇博客【深入ASP.NET原理系列】--ASP.NET请求管道、应用程序生命周期、整体运行机制 童鞋可能知道，ASP.NET应用程序周期中PreRequestHandlerExecute事件与PostRequestHandlerExecute事件之间就是我们的页面生命周期了，对于aspx页面就是一系列的打造页面控件树，触发各种页面时间，对于一般处理程序ashx就是直接执行咱们开发者写的ProcessRequest方法了，对于MVC应用程序就是创建控制器工厂，创建控制器对象，调用Action那一套了。
下面主要讲述的就是ASP.NET WebForm中的页面的生命周期了。
我们用反编译工具查看Page类的ProcessRequest方法可以看见先调用了FrameworkInitialize; FrameworkInitialize里面就是打造了页面控件树，然后调用了ProcessRequestMain，就开始了执行整个页面生命周期了（其实就是调用了一系列的事件方法）（可能部分图看不见右边，可在新标签页中打开图片）
一、打造页面控件数
FrameworkInitialize内部调用了_buildControlTree（）方法
上图中左边是前台页面的代码，右边是对应 生成的打造控件树的代码。中间截取的是生成表单那一部分的代码。
下面看一张原理图
浏览器的DOM树是根据Html标签生成一个C语言的DOM树，而ASP.NET服务器端是用C#打造的一个控件树，也是按照DOM结构打造的。本质是一样。服务器端所有东西都加到页面对象的控件集合中去了。标签在服务器端有对应的控件对象的时候就用控件对象，没有的时候就使用LiteralControl进行封装。不管是服务器控件还是字符串标签（没有runat="server"的标签）都以控件对象的方式存在前台页面类的控件集合里面。好处就是生成前台页面的html代码的时候，只需要遍历控件集合里面的每一个控件对象的RenderControl方法，每一个控件都会调用自己的Render方法生成对应的Html字符串。那么所有控件的生成的html字符串就还原成一个页面的html代码了。
二、触发PerformPreInit事件
在所有初始化之前初始化了这个事件，这个事件主要是初始化了主题，初始化了母版页
1 private void PerformPreInit() 2 3 { 4 5 this.OnPreInit(EventArgs.Empty); 6 7 this.InitializeThemes(); 8 9 this.ApplyMasterPage();10 11 this._preInitWorkComplete = true;12 13 }View Code
三、触发InitRecursive事件
四、触发LoadAllState()事件
加载页面状态解析ViewState，将页面表单中的ViewState进行反Base64编码，反序列化，存在页面的ViewState属性中
五、触发ProcessPostData(this._requestValueCollection, true)事件
1 private void ProcessPostData(NameValueCollection postData, bool fBeforeLoad) 2 { 3 if (this._changedPostDataConsumers == null) 4 { 5 this._changedPostDataConsumers = new ArrayList(); 6 } 7 if (postData != null) 8 { 9 foreach (string str in postData) 10 { 11 if ((str != null) && !IsSystemPostField(str)) 12 { 13 Control control = this.FindControl(str); 14 if (control == null) 15 { 16 if (fBeforeLoad) 17 { 18 if (this._leftoverPostData == null) 19 { 20 this._leftoverPostData = new NameValueCollection(); 21 } 22 this._leftoverPostData.Add(str, null); 23 } 24 } 25 else 26 { 27 IPostBackDataHandler postBackDataHandler = control.PostBackDataHandler; 28 if (postBackDataHandler == null) 29 { 30 if (control.PostBackEventHandler != null) 31 { 32 this.RegisterRequiresRaiseEvent(control.PostBackEventHandler); 33 } 34 } 35 else 36 { 37 if (postBackDataHandler != null) 38 { 39 NameValueCollection postCollection = control.CalculateEffectiveValidateRequest() ? this._requestValueCollection : this._unvalidatedRequestValueCollection; 40 if (postBackDataHandler.LoadPostData(str, postCollection)) 41 { 42 this._changedPostDataConsumers.Add(control); 43 } 44 } 45 if (this._controlsRequiringPostBack != null) 46 { 47 this._controlsRequiringPostBack.Remove(str); 48 } 49 } 50 } 51 } 52 } 53 } 54 ArrayList list = null; 55 if (this._controlsRequiringPostBack != null) 56 { 57 foreach (string str2 in this._controlsRequiringPostBack) 58 { 59 Control control2 = this.FindControl(str2); 60 if (control2 != null) 61 { 62 IPostBackDataHandler adapterInternal = control2.AdapterInternal as IPostBackDataHandler; 63 if (adapterInternal == null) 64 { 65 adapterInternal = control2 as IPostBackDataHandler; 66 } 67 if (adapterInternal == null) 68 { 69 object[] args = new object[] { str2 }; 70 throw new HttpException(SR.GetString("Postback_ctrl_not_found", args)); 71 } 72 NameValueCollection values2 = control2.CalculateEffectiveValidateRequest() ? this._requestValueCollection : this._unvalidatedRequestValueCollection; 73 if (adapterInternal.LoadPostData(str2, values2)) 74 { 75 this._changedPostDataConsumers.Add(control2); 76 } 77 } 78 else if (fBeforeLoad) 79 { 80 if (list == null) 81 { 82 list = new ArrayList(); 83 } 84 list.Add(str2); 85 } 86 } 87 this._controlsRequiringPostBack = list; 88 } 89 } 90 91 92 93 94 private void ProcessPostData(NameValueCollection postData, bool fBeforeLoad) 95 { 96 if (this._changedPostDataConsumers == null) 97 { 98 this._changedPostDataConsumers = new ArrayList(); 99 }100 if (postData != null)101 {102 foreach (string str in postData)103 {104 if ((str != null) && !IsSystemPostField(str))105 {106 Control control = this.FindControl(str);107 if (control == null)108 {109 if (fBeforeLoad)110 {111 if (this._leftoverPostData == null)112 {113 this._leftoverPostData = new NameValueCollection();114 }115 this._leftoverPostData.Add(str, null);116 }117 }118 else119 {120 IPostBackDataHandler postBackDataHandler = control.PostBackDataHandler;121 if (postBackDataHandler == null)122 {123 if (control.PostBackEventHandler != null)124 {125 this.RegisterRequiresRaiseEvent(control.PostBackEventHandler);126 }127 }128 else129 {130 if (postBackDataHandler != null)131 {132 NameValueCollection postCollection = control.CalculateEffectiveValidateRequest() ? this._requestValueCollection : this._unvalidatedRequestValueCollection;133 if (postBackDataHandler.LoadPostData(str, postCollection))134 {135 this._changedPostDataConsumers.Add(control);136 }137 }138 if (this._controlsRequiringPostBack != null)139 {140 this._controlsRequiringPostBack.Remove(str);141 }142 }143 }144 }145 }146 }147 ArrayList list = null;148 if (this._controlsRequiringPostBack != null)149 {150 foreach (string str2 in this._controlsRequiringPostBack)151 {152 Control control2 = this.FindControl(str2);153 if (control2 != null)154 {155 IPostBackDataHandler adapterInternal = control2.AdapterInternal as IPostBackDataHandler;156 if (adapterInternal == null)157 {158 adapterInternal = control2 as IPostBackDataHandler;159 }160 if (adapterInternal == null)161 {162 object[] args = new object[] { str2 };163 throw new HttpException(SR.GetString("Postback_ctrl_not_found", args));164 }165 NameValueCollection values2 = control2.CalculateEffectiveValidateRequest() ? this._requestValueCollection : this._unvalidatedRequestValueCollection;166 if (adapterInternal.LoadPostData(str2, values2))167 {168 this._changedPostDataConsumers.Add(control2);169 }170 }171 else if (fBeforeLoad)172 {173 if (list == null)174 {175 list = new ArrayList();176 }177 list.Add(str2);178 }179 }180 this._controlsRequiringPostBack = list;181 }182 }183 184 View Code
主要做了两件事
1）将表单里提交过来的控件数据设置给页面对象的控件树中对应控件的属性（给前面打造的控件树里面控件给值）， 这样在服务器端就可以拿到客户端输入的值了。
2）将表单里面提交过来的值与ViewState中控件原来的值进行比对，不同则表示要触发该控件的Change 事件，则同 时将该控件放到一个集合（看源码其实就是changedPostDataConsumers）中。在后续执行过程中遍历改集合 依次触发对应控件的Change事件。
六、触发LoadRecursive()事件
大名鼎鼎的Page_Load就是在这里执行的。不过是先执行页面本身的Load事件再执行页面控件的Load事件哦
七、再次触发ProcessPostData(this._leftoverPostData, false)事件
这个事件我在网上看了很多人说是将第一次遗漏下来的，第一次执行ProcessPostData没有涉及到的控件进行处理，但是并没有说明哪些遗漏下来了。为什么第一次没处理了？ 最后Google查到是处理我们开发者在页面的Page_Load方法中添加的控件。在Page_Load中我们可以自己创建控件对象加到页面对应的“C#DOM树中“，如：在Page_Load中写
TextBox txt = new TextBox();txt.ID ="myTxtBox";this.form1.Controls.Add(txt);
这就是把开发者自己创建的控件加在页面的form1的表单中。当然你也可以加上Change事件了创建控件的时候。执行的还是上面那两件事了。则回发的时候可以给开发者在Page_Lod中手动创建的控件还原值。
八、触发RaiseChangedEvents事件
循环遍历changedPostDataConsumers集合中的所有控件，依次执行控件的非点击回传事件，比如文本框的改变事件等
九、触发RaisePostBackEvent(this._requestValueCollection)事件
执行按钮点击回传事件或者验证事件，如果有多个按钮，根据回发过来的按钮的 name来判断触发哪个按钮的事件，或者触发该控件的验证事件
十、触发PerformPreRenderComplete事件
循环遍历控件树中所有的控件，根据每个控件生成对应的Html代码，把服务器控件渲染成普通的html控件。
十一、触发事件SaveAllState事件
将服务器端ViewState集合中的内容（开发者自己加的数据或控件状态信息等）序列化然后Base64编码然后设置到客户端隐藏域__ViewState中
十二、RenderControl(this.CreateHtmlTextWriter(this.Response.Output))
把要发送到客户端浏览器的内容设置到Response.Output，应用程序将它发送 到客户端浏览器。
看到这里不知道大家是否已经可以清晰地回答开篇提到的几个问题了，其实就是这些事件执行的先后顺序，页面生命周期了
最后附上生命周期ProcessRequest源码
1 private void ProcessRequestMain(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint) 2 { 3 try 4 { 5 HttpContext context = this.Context; 6 string str = null; 7 if (includeStagesBeforeAsyncPoint) 8 { 9 if (this.IsInAspCompatMode) 10 { 11 AspCompatApplicationStep.OnPageStartSessionObjects(); 12 } 13 if (this.PageAdapter != null) 14 { 15 this._requestValueCollection = this.PageAdapter.DeterminePostBackMode(); 16 if (this._requestValueCollection != null) 17 { 18 this._unvalidatedRequestValueCollection = this.PageAdapter.DeterminePostBackModeUnvalidated(); 19 } 20 } 21 else 22 { 23 this._requestValueCollection = this.DeterminePostBackMode(); 24 if (this._requestValueCollection != null) 25 { 26 this._unvalidatedRequestValueCollection = this.DeterminePostBackModeUnvalidated(); 27 } 28 } 29 string callbackControlID = string.Empty; 30 if (this.DetermineIsExportingWebPart()) 31 { 32 if (!RuntimeConfig.GetAppConfig().WebParts.EnableExport) 33 { 34 throw new InvalidOperationException(SR.GetString("WebPartExportHandler_DisabledExportHandler")); 35 } 36 str = this.Request.QueryString["webPart"]; 37 if (string.IsNullOrEmpty(str)) 38 { 39 throw new InvalidOperationException(SR.GetString("WebPartExportHandler_InvalidArgument")); 40 } 41 if (string.Equals(this.Request.QueryString["scope"], "shared", StringComparison.OrdinalIgnoreCase)) 42 { 43 this._pageFlags.Set(4); 44 } 45 string str3 = this.Request.QueryString["query"]; 46 if (str3 == null) 47 { 48 str3 = string.Empty; 49 } 50 this.Request.QueryStringText = str3; 51 context.Trace.IsEnabled = false; 52 } 53 if (this._requestValueCollection != null) 54 { 55 if (this._requestValueCollection["__VIEWSTATEENCRYPTED"] != null) 56 { 57 this.ContainsEncryptedViewState = true; 58 } 59 callbackControlID = this._requestValueCollection["__CALLBACKID"]; 60 if ((callbackControlID != null) && (this._request.HttpVerb == HttpVerb.POST)) 61 { 62 this._isCallback = true; 63 } 64 else if (!this.IsCrossPagePostBack) 65 { 66 VirtualPath path = null; 67 if (this._requestValueCollection["__PREVIOUSPAGE"] != null) 68 { 69 try 70 { 71 path = VirtualPath.CreateNonRelativeAllowNull(DecryptString(this._requestValueCollection["__PREVIOUSPAGE"], Purpose.WebForms_Page_PreviousPageID)); 72 } 73 catch 74 { 75 this._pageFlags[8] = true; 76 } 77 if ((path != null) && (path != this.Request.CurrentExecutionFilePathObject)) 78 { 79 this._pageFlags[8] = true; 80 this._previousPagePath = path; 81 } 82 } 83 } 84 } 85 if (this.MaintainScrollPositionOnPostBack) 86 { 87 this.LoadScrollPosition(); 88 } 89 if (context.TraceIsEnabled) 90 { 91 this.Trace.Write("aspx.page", "Begin PreInit"); 92 } 93 if (EtwTrace.IsTraceEnabled(5, 4)) 94 { 95 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_INIT_ENTER, this._context.WorkerRequest); 96 } 97 this.PerformPreInit(); 98 if (EtwTrace.IsTraceEnabled(5, 4)) 99 {100 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_INIT_LEAVE, this._context.WorkerRequest);101 }102 if (context.TraceIsEnabled)103 {104 this.Trace.Write("aspx.page", "End PreInit");105 }106 if (context.TraceIsEnabled)107 {108 this.Trace.Write("aspx.page", "Begin Init");109 }110 if (EtwTrace.IsTraceEnabled(5, 4))111 {112 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_INIT_ENTER, this._context.WorkerRequest);113 }114 this.InitRecursive(null);115 if (EtwTrace.IsTraceEnabled(5, 4))116 {117 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_INIT_LEAVE, this._context.WorkerRequest);118 }119 if (context.TraceIsEnabled)120 {121 this.Trace.Write("aspx.page", "End Init");122 }123 if (context.TraceIsEnabled)124 {125 this.Trace.Write("aspx.page", "Begin InitComplete");126 }127 this.OnInitComplete(EventArgs.Empty);128 if (context.TraceIsEnabled)129 {130 this.Trace.Write("aspx.page", "End InitComplete");131 }132 if (this.IsPostBack)133 {134 if (context.TraceIsEnabled)135 {136 this.Trace.Write("aspx.page", "Begin LoadState");137 }138 if (EtwTrace.IsTraceEnabled(5, 4))139 {140 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_VIEWSTATE_ENTER, this._context.WorkerRequest);141 }142 this.LoadAllState();143 if (EtwTrace.IsTraceEnabled(5, 4))144 {145 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_VIEWSTATE_LEAVE, this._context.WorkerRequest);146 }147 if (context.TraceIsEnabled)148 {149 this.Trace.Write("aspx.page", "End LoadState");150 this.Trace.Write("aspx.page", "Begin ProcessPostData");151 }152 if (EtwTrace.IsTraceEnabled(5, 4))153 {154 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_POSTDATA_ENTER, this._context.WorkerRequest);155 }156 this.ProcessPostData(this._requestValueCollection, true);157 if (EtwTrace.IsTraceEnabled(5, 4))158 {159 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_POSTDATA_LEAVE, this._context.WorkerRequest);160 }161 if (context.TraceIsEnabled)162 {163 this.Trace.Write("aspx.page", "End ProcessPostData");164 }165 }166 if (context.TraceIsEnabled)167 {168 this.Trace.Write("aspx.page", "Begin PreLoad");169 }170 this.OnPreLoad(EventArgs.Empty);171 if (context.TraceIsEnabled)172 {173 this.Trace.Write("aspx.page", "End PreLoad");174 }175 if (context.TraceIsEnabled)176 {177 this.Trace.Write("aspx.page", "Begin Load");178 }179 if (EtwTrace.IsTraceEnabled(5, 4))180 {181 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_ENTER, this._context.WorkerRequest);182 }183 this.LoadRecursive();184 if (EtwTrace.IsTraceEnabled(5, 4))185 {186 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_LEAVE, this._context.WorkerRequest);187 }188 if (context.TraceIsEnabled)189 {190 this.Trace.Write("aspx.page", "End Load");191 }192 if (this.IsPostBack)193 {194 if (context.TraceIsEnabled)195 {196 this.Trace.Write("aspx.page", "Begin ProcessPostData Second Try");197 }198 this.ProcessPostData(this._leftoverPostData, false);199 if (context.TraceIsEnabled)200 {201 this.Trace.Write("aspx.page", "End ProcessPostData Second Try");202 this.Trace.Write("aspx.page", "Begin Raise ChangedEvents");203 }204 if (EtwTrace.IsTraceEnabled(5, 4))205 {206 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_POST_DATA_CHANGED_ENTER, this._context.WorkerRequest);207 }208 this.RaiseChangedEvents();209 if (EtwTrace.IsTraceEnabled(5, 4))210 {211 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_POST_DATA_CHANGED_LEAVE, this._context.WorkerRequest);212 }213 if (context.TraceIsEnabled)214 {215 this.Trace.Write("aspx.page", "End Raise ChangedEvents");216 this.Trace.Write("aspx.page", "Begin Raise PostBackEvent");217 }218 if (EtwTrace.IsTraceEnabled(5, 4))219 {220 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RAISE_POSTBACK_ENTER, this._context.WorkerRequest);221 }222 this.RaisePostBackEvent(this._requestValueCollection);223 if (EtwTrace.IsTraceEnabled(5, 4))224 {225 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RAISE_POSTBACK_LEAVE, this._context.WorkerRequest);226 }227 if (context.TraceIsEnabled)228 {229 this.Trace.Write("aspx.page", "End Raise PostBackEvent");230 }231 }232 if (context.TraceIsEnabled)233 {234 this.Trace.Write("aspx.page", "Begin LoadComplete");235 }236 this.OnLoadComplete(EventArgs.Empty);237 if (context.TraceIsEnabled)238 {239 this.Trace.Write("aspx.page", "End LoadComplete");240 }241 if (this.IsPostBack && this.IsCallback)242 {243 this.PrepareCallback(callbackControlID);244 }245 else if (!this.IsCrossPagePostBack)246 {247 if (context.TraceIsEnabled)248 {249 this.Trace.Write("aspx.page", "Begin PreRender");250 }251 if (EtwTrace.IsTraceEnabled(5, 4))252 {253 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_RENDER_ENTER, this._context.WorkerRequest);254 }255 this.PreRenderRecursiveInternal();256 if (EtwTrace.IsTraceEnabled(5, 4))257 {258 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_RENDER_LEAVE, this._context.WorkerRequest);259 }260 if (context.TraceIsEnabled)261 {262 this.Trace.Write("aspx.page", "End PreRender");263 }264 }265 }266 if ((this._legacyAsyncInfo == null) || this._legacyAsyncInfo.CallerIsBlocking)267 {268 this.ExecuteRegisteredAsyncTasks();269 }270 this.ValidateRawUrlIfRequired();271 if (includeStagesAfterAsyncPoint)272 {273 if (this.IsCallback)274 {275 this.RenderCallback();276 }277 else if (!this.IsCrossPagePostBack)278 {279 if (context.TraceIsEnabled)280 {281 this.Trace.Write("aspx.page", "Begin PreRenderComplete");282 }283 this.PerformPreRenderComplete();284 if (context.TraceIsEnabled)285 {286 this.Trace.Write("aspx.page", "End PreRenderComplete");287 }288 if (context.TraceIsEnabled)289 {290 this.BuildPageProfileTree(this.EnableViewState);291 this.Trace.Write("aspx.page", "Begin SaveState");292 }293 if (EtwTrace.IsTraceEnabled(5, 4))294 {295 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_SAVE_VIEWSTATE_ENTER, this._context.WorkerRequest);296 }297 this.SaveAllState();298 if (EtwTrace.IsTraceEnabled(5, 4))299 {300 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_SAVE_VIEWSTATE_LEAVE, this._context.WorkerRequest);301 }302 if (context.TraceIsEnabled)303 {304 this.Trace.Write("aspx.page", "End SaveState");305 this.Trace.Write("aspx.page", "Begin SaveStateComplete");306 }307 this.OnSaveStateComplete(EventArgs.Empty);308 if (context.TraceIsEnabled)309 {310 this.Trace.Write("aspx.page", "End SaveStateComplete");311 this.Trace.Write("aspx.page", "Begin Render");312 }313 if (EtwTrace.IsTraceEnabled(5, 4))314 {315 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RENDER_ENTER, this._context.WorkerRequest);316 }317 if (str != null)318 {319 this.ExportWebPart(str);320 }321 else322 {323 this.RenderControl(this.CreateHtmlTextWriter(this.Response.Output));324 }325 if (EtwTrace.IsTraceEnabled(5, 4))326 {327 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RENDER_LEAVE, this._context.WorkerRequest);328 }329 if (context.TraceIsEnabled)330 {331 this.Trace.Write("aspx.page", "End Render");332 }333 this.CheckRemainingAsyncTasks(false);334 }335 }336 }337 catch (ThreadAbortException exception1)338 {339 HttpApplication.CancelModuleException exceptionState = exception1.ExceptionState as HttpApplication.CancelModuleException;340 if ((((includeStagesBeforeAsyncPoint & includeStagesAfterAsyncPoint) && (this._context.Handler == this)) && ((this._context.ApplicationInstance != null) && (exceptionState != null))) && !exceptionState.Timeout)341 {342 this._context.ApplicationInstance.CompleteRequest();343 ThreadResetAbortWithAssert();344 }345 else346 {347 this.CheckRemainingAsyncTasks(true);348 throw;349 }350 }351 catch (ConfigurationException)352 {353 throw;354 }355 catch (Exception exception2)356 {357 PerfCounters.IncrementCounter(AppPerfCounter.ERRORS_DURING_REQUEST);358 PerfCounters.IncrementCounter(AppPerfCounter.ERRORS_TOTAL);359 if (!this.HandleError(exception2))360 {361 throw;362 }363 }364 }365 366 367 368 369 private void ProcessRequestMain(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint)370 {371 try372 {373 HttpContext context = this.Context;374 string str = null;375 if (includeStagesBeforeAsyncPoint)376 {377 if (this.IsInAspCompatMode)378 {379 AspCompatApplicationStep.OnPageStartSessionObjects();380 }381 if (this.PageAdapter != null)382 {383 this._requestValueCollection = this.PageAdapter.DeterminePostBackMode();384 if (this._requestValueCollection != null)385 {386 this._unvalidatedRequestValueCollection = this.PageAdapter.DeterminePostBackModeUnvalidated();387 }388 }389 else390 {391 this._requestValueCollection = this.DeterminePostBackMode();392 if (this._requestValueCollection != null)393 {394 this._unvalidatedRequestValueCollection = this.DeterminePostBackModeUnvalidated();395 }396 }397 string callbackControlID = string.Empty;398 if (this.DetermineIsExportingWebPart())399 {400 if (!RuntimeConfig.GetAppConfig().WebParts.EnableExport)401 {402 throw new InvalidOperationException(SR.GetString("WebPartExportHandler_DisabledExportHandler"));403 }404 str = this.Request.QueryString["webPart"];405 if (string.IsNullOrEmpty(str))406 {407 throw new InvalidOperationException(SR.GetString("WebPartExportHandler_InvalidArgument"));408 }409 if (string.Equals(this.Request.QueryString["scope"], "shared", StringComparison.OrdinalIgnoreCase))410 {411 this._pageFlags.Set(4);412 }413 string str3 = this.Request.QueryString["query"];414 if (str3 == null)415 {416 str3 = string.Empty;417 }418 this.Request.QueryStringText = str3;419 context.Trace.IsEnabled = false;420 }421 if (this._requestValueCollection != null)422 {423 if (this._requestValueCollection["__VIEWSTATEENCRYPTED"] != null)424 {425 this.ContainsEncryptedViewState = true;426 }427 callbackControlID = this._requestValueCollection["__CALLBACKID"];428 if ((callbackControlID != null) && (this._request.HttpVerb == HttpVerb.POST))429 {430 this._isCallback = true;431 }432 else if (!this.IsCrossPagePostBack)433 {434 VirtualPath path = null;435 if (this._requestValueCollection["__PREVIOUSPAGE"] != null)436 {437 try438 {439 path = VirtualPath.CreateNonRelativeAllowNull(DecryptString(this._requestValueCollection["__PREVIOUSPAGE"], Purpose.WebForms_Page_PreviousPageID));440 }441 catch442 {443 this._pageFlags[8] = true;444 }445 if ((path != null) && (path != this.Request.CurrentExecutionFilePathObject))446 {447 this._pageFlags[8] = true;448 this._previousPagePath = path;449 }450 }451 }452 }453 if (this.MaintainScrollPositionOnPostBack)454 {455 this.LoadScrollPosition();456 }457 if (context.TraceIsEnabled)458 {459 this.Trace.Write("aspx.page", "Begin PreInit");460 }461 if (EtwTrace.IsTraceEnabled(5, 4))462 {463 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_INIT_ENTER, this._context.WorkerRequest);464 }465 this.PerformPreInit();466 if (EtwTrace.IsTraceEnabled(5, 4))467 {468 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_INIT_LEAVE, this._context.WorkerRequest);469 }470 if (context.TraceIsEnabled)471 {472 this.Trace.Write("aspx.page", "End PreInit");473 }474 if (context.TraceIsEnabled)475 {476 this.Trace.Write("aspx.page", "Begin Init");477 }478 if (EtwTrace.IsTraceEnabled(5, 4))479 {480 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_INIT_ENTER, this._context.WorkerRequest);481 }482 this.InitRecursive(null);483 if (EtwTrace.IsTraceEnabled(5, 4))484 {485 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_INIT_LEAVE, this._context.WorkerRequest);486 }487 if (context.TraceIsEnabled)488 {489 this.Trace.Write("aspx.page", "End Init");490 }491 if (context.TraceIsEnabled)492 {493 this.Trace.Write("aspx.page", "Begin InitComplete");494 }495 this.OnInitComplete(EventArgs.Empty);496 if (context.TraceIsEnabled)497 {498 this.Trace.Write("aspx.page", "End InitComplete");499 }500 if (this.IsPostBack)501 {502 if (context.TraceIsEnabled)503 {504 this.Trace.Write("aspx.page", "Begin LoadState");505 }506 if (EtwTrace.IsTraceEnabled(5, 4))507 {508 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_VIEWSTATE_ENTER, this._context.WorkerRequest);509 }510 this.LoadAllState();511 if (EtwTrace.IsTraceEnabled(5, 4))512 {513 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_VIEWSTATE_LEAVE, this._context.WorkerRequest);514 }515 if (context.TraceIsEnabled)516 {517 this.Trace.Write("aspx.page", "End LoadState");518 this.Trace.Write("aspx.page", "Begin ProcessPostData");519 }520 if (EtwTrace.IsTraceEnabled(5, 4))521 {522 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_POSTDATA_ENTER, this._context.WorkerRequest);523 }524 this.ProcessPostData(this._requestValueCollection, true);525 if (EtwTrace.IsTraceEnabled(5, 4))526 {527 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_POSTDATA_LEAVE, this._context.WorkerRequest);528 }529 if (context.TraceIsEnabled)530 {531 this.Trace.Write("aspx.page", "End ProcessPostData");532 }533 }534 if (context.TraceIsEnabled)535 {536 this.Trace.Write("aspx.page", "Begin PreLoad");537 }538 this.OnPreLoad(EventArgs.Empty);539 if (context.TraceIsEnabled)540 {541 this.Trace.Write("aspx.page", "End PreLoad");542 }543 if (context.TraceIsEnabled)544 {545 this.Trace.Write("aspx.page", "Begin Load");546 }547 if (EtwTrace.IsTraceEnabled(5, 4))548 {549 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_ENTER, this._context.WorkerRequest);550 }551 this.LoadRecursive();552 if (EtwTrace.IsTraceEnabled(5, 4))553 {554 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_LEAVE, this._context.WorkerRequest);555 }556 if (context.TraceIsEnabled)557 {558 this.Trace.Write("aspx.page", "End Load");559 }560 if (this.IsPostBack)561 {562 if (context.TraceIsEnabled)563 {564 this.Trace.Write("aspx.page", "Begin ProcessPostData Second Try");565 }566 this.ProcessPostData(this._leftoverPostData, false);567 if (context.TraceIsEnabled)568 {569 this.Trace.Write("aspx.page", "End ProcessPostData Second Try");570 this.Trace.Write("aspx.page", "Begin Raise ChangedEvents");571 }572 if (EtwTrace.IsTraceEnabled(5, 4))573 {574 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_POST_DATA_CHANGED_ENTER, this._context.WorkerRequest);575 }576 this.RaiseChangedEvents();577 if (EtwTrace.IsTraceEnabled(5, 4))578 {579 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_POST_DATA_CHANGED_LEAVE, this._context.WorkerRequest);580 }581 if (context.TraceIsEnabled)582 {583 this.Trace.Write("aspx.page", "End Raise ChangedEvents");584 this.Trace.Write("aspx.page", "Begin Raise PostBackEvent");585 }586 if (EtwTrace.IsTraceEnabled(5, 4))587 {588 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RAISE_POSTBACK_ENTER, this._context.WorkerRequest);589 }590 this.RaisePostBackEvent(this._requestValueCollection);591 if (EtwTrace.IsTraceEnabled(5, 4))592 {593 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RAISE_POSTBACK_LEAVE, this._context.WorkerRequest);594 }595 if (context.TraceIsEnabled)596 {597 this.Trace.Write("aspx.page", "End Raise PostBackEvent");598 }599 }600 if (context.TraceIsEnabled)601 {602 this.Trace.Write("aspx.page", "Begin LoadComplete");603 }604 this.OnLoadComplete(EventArgs.Empty);605 if (context.TraceIsEnabled)606 {607 this.Trace.Write("aspx.page", "End LoadComplete");608 }609 if (this.IsPostBack && this.IsCallback)610 {611 this.PrepareCallback(callbackControlID);612 }613 else if (!this.IsCrossPagePostBack)614 {615 if (context.TraceIsEnabled)616 {617 this.Trace.Write("aspx.page", "Begin PreRender");618 }619 if (EtwTrace.IsTraceEnabled(5, 4))620 {621 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_RENDER_ENTER, this._context.WorkerRequest);622 }623 this.PreRenderRecursiveInternal();624 if (EtwTrace.IsTraceEnabled(5, 4))625 {626 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_RENDER_LEAVE, this._context.WorkerRequest);627 }628 if (context.TraceIsEnabled)629 {630 this.Trace.Write("aspx.page", "End PreRender");631 }632 }633 }634 if ((this._legacyAsyncInfo == null) || this._legacyAsyncInfo.CallerIsBlocking)635 {636 this.ExecuteRegisteredAsyncTasks();637 }638 this.ValidateRawUrlIfRequired();639 if (includeStagesAfterAsyncPoint)640 {641 if (this.IsCallback)642 {643 this.RenderCallback();644 }645 else if (!this.IsCrossPagePostBack)646 {647 if (context.TraceIsEnabled)648 {649 this.Trace.Write("aspx.page", "Begin PreRenderComplete");650 }651 this.PerformPreRenderComplete();652 if (context.TraceIsEnabled)653 {654 this.Trace.Write("aspx.page", "End PreRenderComplete");655 }656 if (context.TraceIsEnabled)657 {658 this.BuildPageProfileTree(this.EnableViewState);659 this.Trace.Write("aspx.page", "Begin SaveState");660 }661 if (EtwTrace.IsTraceEnabled(5, 4))662 {663 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_SAVE_VIEWSTATE_ENTER, this._context.WorkerRequest);664 }665 this.SaveAllState();666 if (EtwTrace.IsTraceEnabled(5, 4))667 {668 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_SAVE_VIEWSTATE_LEAVE, this._context.WorkerRequest);669 }670 if (context.TraceIsEnabled)671 {672 this.Trace.Write("aspx.page", "End SaveState");673 this.Trace.Write("aspx.page", "Begin SaveStateComplete");674 }675 this.OnSaveStateComplete(EventArgs.Empty);676 if (context.TraceIsEnabled)677 {678 this.Trace.Write("aspx.page", "End SaveStateComplete");679 this.Trace.Write("aspx.page", "Begin Render");680 }681 if (EtwTrace.IsTraceEnabled(5, 4))682 {683 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RENDER_ENTER, this._context.WorkerRequest);684 }685 if (str != null)686 {687 this.ExportWebPart(str);688 }689 else690 {691 this.RenderControl(this.CreateHtmlTextWriter(this.Response.Output));692 }693 if (EtwTrace.IsTraceEnabled(5, 4))694 {695 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RENDER_LEAVE, this._context.WorkerRequest);696 }697 if (context.TraceIsEnabled)698 {699 this.Trace.Write("aspx.page", "End Render");700 }701 this.CheckRemainingAsyncTasks(false);702 }703 }704 }705 catch (ThreadAbortException exception1)706 {707 HttpApplication.CancelModuleException exceptionState = exception1.ExceptionState as HttpApplication.CancelModuleException;708 if ((((includeStagesBeforeAsyncPoint & includeStagesAfterAsyncPoint) && (this._context.Handler == this)) && ((this._context.ApplicationInstance != null) && (exceptionState != null))) && !exceptionState.Timeout)709 {710 this._context.ApplicationInstance.CompleteRequest();711 ThreadResetAbortWithAssert();712 }713 else714 {715 this.CheckRemainingAsyncTasks(true);716 throw;717 }718 }719 catch (ConfigurationException)720 {721 throw;722 }723 catch (Exception exception2)724 {725 PerfCounters.IncrementCounter(AppPerfCounter.ERRORS_DURING_REQUEST);726 PerfCounters.IncrementCounter(AppPerfCounter.ERRORS_TOTAL);727 if (!this.HandleError(exception2))728 {729 throw;730 }731 }732 }733 734 View Code
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作者：张一辉
出处：http://www.cnblogs.com/zhangyihui/
本文以学习、研究和分享为主，版权归作者和博客园共有，欢迎转载，但必须在文章页面明显位置给出此段申明。
原标题：【深入ASP.NET原理系列】
关键词：ASP.NET
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