ASP.NET頁面運行時候,頁面將經歷一個生命周期,在生命周期中將執行一系列的處理步驟。包括初始化、實例化控件、還原和維護狀態、運行時間處理程序代碼以及進行呈現。熟悉頁面生命周期非常重要,這樣我們才能在生命周期的合適階段編寫代碼。如果我們能在寫代碼的時候想著我們現在是在做生命周期的哪一步那將是非常好的。
了解ASP.NET請求管道、應用程序生命周期、整體運行機制童鞋可能知道,ASP.NET應用程序周期中PreRequestHandlerExecute事件與PostRequestHandlerExecute事件之間就是我們的頁面生命周期了,對于aspx頁面就是一系列的打造頁面控件樹,觸發各種頁面時間,對于一般處理程序ashx就是直接執行咱們開發者寫的ProcessRequest方法了,對于MVC應用程序就是創建控制器工廠,創建控制器對象,調用Action那一套了。
我們用反編譯工具查看Page類的ProcessRequest方法可以看見先調用了FrameworkInitialize; FrameworkInitialize里面就是打造了頁面控件樹,然后調用了ProcessRequestMain,就開始了執行整個頁面生命周期了(其實就是調用了一系列的事件方法)(可能部分圖看不見右邊,可在新標簽頁中打開圖片)
瀏覽器的DOM樹是根據Html標簽生成一個C語言的DOM樹,而ASP.NET服務器端是用C#打造的一個控件樹,也是按照DOM結構打造的。本質是一樣。服務器端所有東西都加到頁面對象的控件集合中去了。標簽在服務器端有對應的控件對象的時候就用控件對象,沒有的時候就使用LiteralControl進行封裝。不管是服務器控件還是字符串標簽(沒有runat="server"的標簽)都以控件對象的方式存在前臺頁面類的控件集合里面。好處就是生成前臺頁面的html代碼的時候,只需要遍歷控件集合里面的每一個控件對象的RenderControl方法,每一個控件都會調用自己的Render方法生成對應的Html字符串。那么所有控件的生成的html字符串就還原成一個頁面的html代碼了。
2)將表單里面提交過來的值與ViewState中控件原來的值進行比對,不同則表示要觸發該控件的Change 事件,則同時將該控件放到一個集合(看源碼其實就是changedPostDataConsumers)中。在后續執行過程中遍歷改集合依次觸發對應控件的Change事件。
大名鼎鼎的Page_Load就是在這里執行的。不過是先執行頁面本身的Load事件再執行頁面控件的Load事件哦,這時候前面給控件賦的值,表單提交過來的數據,ViewState等等都可以使用了,IsPostBack的原理就是判斷是否有name為__VIEWSTATE的數據提交過來
7.再次觸發ProcessPostData(this._leftoverPostData, false)事件
這個事件我在網上看了很多人說是將第一次遺漏下來的,第一次執行ProcessPostData沒有涉及到的控件進行處理,但是并沒有說明哪些遺漏下來了。為什么第一次沒處理了? 最后Google查到是處理我們開發者在頁面的Page_Load方法中添加的控件。在Page_Load中我們可以自己創建控件對象加到頁面對應的“C#DOM樹中“,如:在Page_Load中寫
TextBox txt = new TextBox();txt.ID ="myTxtBox";this.form1.Controls.Add(txt);
這就是把開發者自己創建的控件加在頁面的form1的表單中。當然你也可以加上Change事件了創建控件的時候。執行的還是上面那兩件事了。則回發的時候可以給開發者在Page_Lod中手動創建的控件還原值。
private void ProcessRequestMain(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint)
{
try
{
HttpContext context = this.Context;
string str = null;
if (includeStagesBeforeAsyncPoint)
{
if (this.IsInAspCompatMode)
{
AspCompatApplicationStep.OnPageStartSessionObjects();
}
if (this.PageAdapter != null)
{
this._requestValueCollection = this.PageAdapter.DeterminePostBackMode();
if (this._requestValueCollection != null)
{
this._unvalidatedRequestValueCollection = this.PageAdapter.DeterminePostBackModeUnvalidated();
}
}
else
{
this._requestValueCollection = this.DeterminePostBackMode();
if (this._requestValueCollection != null)
{
this._unvalidatedRequestValueCollection = this.DeterminePostBackModeUnvalidated();
}
}
string callbackControlID = string.Empty;
if (this.DetermineIsExportingWebPart())
{
if (!RuntimeConfig.GetAppConfig().WebParts.EnableExport)
{
throw new InvalidOperationException(SR.GetString("WebPartExportHandler_DisabledExportHandler"));
}
str = this.Request.QueryString["webPart"];
if (string.IsNullOrEmpty(str))
{
throw new InvalidOperationException(SR.GetString("WebPartExportHandler_InvalidArgument"));
}
if (string.Equals(this.Request.QueryString["scope"], "shared", StringComparison.OrdinalIgnoreCase))
{
this._pageFlags.Set(4);
}
string str3 = this.Request.QueryString["query"];
if (str3 == null)
{
str3 = string.Empty;
}
this.Request.QueryStringText = str3;
context.Trace.IsEnabled = false;
}
if (this._requestValueCollection != null)
{
if (this._requestValueCollection["__VIEWSTATEENCRYPTED"] != null)
{
this.ContainsEncryptedViewState = true;
}
callbackControlID = this._requestValueCollection["__CALLBACKID"];
if ((callbackControlID != null) (this._request.HttpVerb == HttpVerb.POST))
{
this._isCallback = true;
}
else if (!this.IsCrossPagePostBack)
{
VirtualPath path = null;
if (this._requestValueCollection["__PREVIOUSPAGE"] != null)
{
try
{
path = VirtualPath.CreateNonRelativeAllowNull(DecryptString(this._requestValueCollection["__PREVIOUSPAGE"], Purpose.WebForms_Page_PreviousPageID));
}
catch
{
this._pageFlags[8] = true;
}
if ((path != null) (path != this.Request.CurrentExecutionFilePathObject))
{
this._pageFlags[8] = true;
this._previousPagePath = path;
}
}
}
}
if (this.MaintainScrollPositionOnPostBack)
{
this.LoadScrollPosition();
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin PreInit");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_INIT_ENTER, this._context.WorkerRequest);
}
this.PerformPreInit();
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_INIT_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End PreInit");
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin Init");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_INIT_ENTER, this._context.WorkerRequest);
}
this.InitRecursive(null);
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_INIT_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End Init");
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin InitComplete");
}
this.OnInitComplete(EventArgs.Empty);
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End InitComplete");
}
if (this.IsPostBack)
{
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin LoadState");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_VIEWSTATE_ENTER, this._context.WorkerRequest);
}
this.LoadAllState();
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_VIEWSTATE_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End LoadState");
this.Trace.Write("aspx.page", "Begin ProcessPostData");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_POSTDATA_ENTER, this._context.WorkerRequest);
}
this.ProcessPostData(this._requestValueCollection, true);
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_POSTDATA_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End ProcessPostData");
}
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin PreLoad");
}
this.OnPreLoad(EventArgs.Empty);
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End PreLoad");
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin Load");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_ENTER, this._context.WorkerRequest);
}
this.LoadRecursive();
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End Load");
}
if (this.IsPostBack)
{
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin ProcessPostData Second Try");
}
this.ProcessPostData(this._leftoverPostData, false);
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End ProcessPostData Second Try");
this.Trace.Write("aspx.page", "Begin Raise ChangedEvents");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_POST_DATA_CHANGED_ENTER, this._context.WorkerRequest);
}
this.RaiseChangedEvents();
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_POST_DATA_CHANGED_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End Raise ChangedEvents");
this.Trace.Write("aspx.page", "Begin Raise PostBackEvent");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RAISE_POSTBACK_ENTER, this._context.WorkerRequest);
}
this.RaisePostBackEvent(this._requestValueCollection);
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RAISE_POSTBACK_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End Raise PostBackEvent");
}
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin LoadComplete");
}
this.OnLoadComplete(EventArgs.Empty);
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End LoadComplete");
}
if (this.IsPostBack this.IsCallback)
{
this.PrepareCallback(callbackControlID);
}
else if (!this.IsCrossPagePostBack)
{
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin PreRender");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_RENDER_ENTER, this._context.WorkerRequest);
}
this.PreRenderRecursiveInternal();
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_RENDER_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End PreRender");
}
}
}
if ((this._legacyAsyncInfo == null) || this._legacyAsyncInfo.CallerIsBlocking)
{
this.ExecuteRegisteredAsyncTasks();
}
this.ValidateRawUrlIfRequired();
if (includeStagesAfterAsyncPoint)
{
if (this.IsCallback)
{
this.RenderCallback();
}
else if (!this.IsCrossPagePostBack)
{
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin PreRenderComplete");
}
this.PerformPreRenderComplete();
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End PreRenderComplete");
}
if (context.TraceIsEnabled)
{
this.BuildPageProfileTree(this.EnableViewState);
this.Trace.Write("aspx.page", "Begin SaveState");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_SAVE_VIEWSTATE_ENTER, this._context.WorkerRequest);
}
this.SaveAllState();
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_SAVE_VIEWSTATE_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End SaveState");
this.Trace.Write("aspx.page", "Begin SaveStateComplete");
}
this.OnSaveStateComplete(EventArgs.Empty);
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End SaveStateComplete");
this.Trace.Write("aspx.page", "Begin Render");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RENDER_ENTER, this._context.WorkerRequest);
}
if (str != null)
{
this.ExportWebPart(str);
}
else
{
this.RenderControl(this.CreateHtmlTextWriter(this.Response.Output));
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RENDER_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End Render");
}
this.CheckRemainingAsyncTasks(false);
}
}
}
catch (ThreadAbortException exception1)
{
HttpApplication.CancelModuleException exceptionState = exception1.ExceptionState as HttpApplication.CancelModuleException;
if ((((includeStagesBeforeAsyncPoint includeStagesAfterAsyncPoint) (this._context.Handler == this)) ((this._context.ApplicationInstance != null) (exceptionState != null))) !exceptionState.Timeout)
{
this._context.ApplicationInstance.CompleteRequest();
ThreadResetAbortWithAssert();
}
else
{
this.CheckRemainingAsyncTasks(true);
throw;
}
}
catch (ConfigurationException)
{
throw;
}
catch (Exception exception2)
{
PerfCounters.IncrementCounter(AppPerfCounter.ERRORS_DURING_REQUEST);
PerfCounters.IncrementCounter(AppPerfCounter.ERRORS_TOTAL);
if (!this.HandleError(exception2))
{
throw;
}
}
}
private void ProcessRequestMain(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint)
{
try
{
HttpContext context = this.Context;
string str = null;
if (includeStagesBeforeAsyncPoint)
{
if (this.IsInAspCompatMode)
{
AspCompatApplicationStep.OnPageStartSessionObjects();
}
if (this.PageAdapter != null)
{
this._requestValueCollection = this.PageAdapter.DeterminePostBackMode();
if (this._requestValueCollection != null)
{
this._unvalidatedRequestValueCollection = this.PageAdapter.DeterminePostBackModeUnvalidated();
}
}
else
{
this._requestValueCollection = this.DeterminePostBackMode();
if (this._requestValueCollection != null)
{
this._unvalidatedRequestValueCollection = this.DeterminePostBackModeUnvalidated();
}
}
string callbackControlID = string.Empty;
if (this.DetermineIsExportingWebPart())
{
if (!RuntimeConfig.GetAppConfig().WebParts.EnableExport)
{
throw new InvalidOperationException(SR.GetString("WebPartExportHandler_DisabledExportHandler"));
}
str = this.Request.QueryString["webPart"];
if (string.IsNullOrEmpty(str))
{
throw new InvalidOperationException(SR.GetString("WebPartExportHandler_InvalidArgument"));
}
if (string.Equals(this.Request.QueryString["scope"], "shared", StringComparison.OrdinalIgnoreCase))
{
this._pageFlags.Set(4);
}
string str3 = this.Request.QueryString["query"];
if (str3 == null)
{
str3 = string.Empty;
}
this.Request.QueryStringText = str3;
context.Trace.IsEnabled = false;
}
if (this._requestValueCollection != null)
{
if (this._requestValueCollection["__VIEWSTATEENCRYPTED"] != null)
{
this.ContainsEncryptedViewState = true;
}
callbackControlID = this._requestValueCollection["__CALLBACKID"];
if ((callbackControlID != null) (this._request.HttpVerb == HttpVerb.POST))
{
this._isCallback = true;
}
else if (!this.IsCrossPagePostBack)
{
VirtualPath path = null;
if (this._requestValueCollection["__PREVIOUSPAGE"] != null)
{
try
{
path = VirtualPath.CreateNonRelativeAllowNull(DecryptString(this._requestValueCollection["__PREVIOUSPAGE"], Purpose.WebForms_Page_PreviousPageID));
}
catch
{
this._pageFlags[8] = true;
}
if ((path != null) (path != this.Request.CurrentExecutionFilePathObject))
{
this._pageFlags[8] = true;
this._previousPagePath = path;
}
}
}
}
if (this.MaintainScrollPositionOnPostBack)
{
this.LoadScrollPosition();
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin PreInit");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_INIT_ENTER, this._context.WorkerRequest);
}
this.PerformPreInit();
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_INIT_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End PreInit");
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin Init");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_INIT_ENTER, this._context.WorkerRequest);
}
this.InitRecursive(null);
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_INIT_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End Init");
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin InitComplete");
}
this.OnInitComplete(EventArgs.Empty);
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End InitComplete");
}
if (this.IsPostBack)
{
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin LoadState");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_VIEWSTATE_ENTER, this._context.WorkerRequest);
}
this.LoadAllState();
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_VIEWSTATE_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End LoadState");
this.Trace.Write("aspx.page", "Begin ProcessPostData");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_POSTDATA_ENTER, this._context.WorkerRequest);
}
this.ProcessPostData(this._requestValueCollection, true);
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_POSTDATA_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End ProcessPostData");
}
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin PreLoad");
}
this.OnPreLoad(EventArgs.Empty);
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End PreLoad");
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin Load");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_ENTER, this._context.WorkerRequest);
}
this.LoadRecursive();
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End Load");
}
if (this.IsPostBack)
{
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin ProcessPostData Second Try");
}
this.ProcessPostData(this._leftoverPostData, false);
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End ProcessPostData Second Try");
this.Trace.Write("aspx.page", "Begin Raise ChangedEvents");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_POST_DATA_CHANGED_ENTER, this._context.WorkerRequest);
}
this.RaiseChangedEvents();
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_POST_DATA_CHANGED_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End Raise ChangedEvents");
this.Trace.Write("aspx.page", "Begin Raise PostBackEvent");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RAISE_POSTBACK_ENTER, this._context.WorkerRequest);
}
this.RaisePostBackEvent(this._requestValueCollection);
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RAISE_POSTBACK_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End Raise PostBackEvent");
}
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin LoadComplete");
}
this.OnLoadComplete(EventArgs.Empty);
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End LoadComplete");
}
if (this.IsPostBack this.IsCallback)
{
this.PrepareCallback(callbackControlID);
}
else if (!this.IsCrossPagePostBack)
{
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin PreRender");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_RENDER_ENTER, this._context.WorkerRequest);
}
this.PreRenderRecursiveInternal();
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_RENDER_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End PreRender");
}
}
}
if ((this._legacyAsyncInfo == null) || this._legacyAsyncInfo.CallerIsBlocking)
{
this.ExecuteRegisteredAsyncTasks();
}
this.ValidateRawUrlIfRequired();
if (includeStagesAfterAsyncPoint)
{
if (this.IsCallback)
{
this.RenderCallback();
}
else if (!this.IsCrossPagePostBack)
{
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin PreRenderComplete");
}
this.PerformPreRenderComplete();
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End PreRenderComplete");
}
if (context.TraceIsEnabled)
{
this.BuildPageProfileTree(this.EnableViewState);
this.Trace.Write("aspx.page", "Begin SaveState");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_SAVE_VIEWSTATE_ENTER, this._context.WorkerRequest);
}
this.SaveAllState();
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_SAVE_VIEWSTATE_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End SaveState");
this.Trace.Write("aspx.page", "Begin SaveStateComplete");
}
this.OnSaveStateComplete(EventArgs.Empty);
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End SaveStateComplete");
this.Trace.Write("aspx.page", "Begin Render");
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RENDER_ENTER, this._context.WorkerRequest);
}
if (str != null)
{
this.ExportWebPart(str);
}
else
{
this.RenderControl(this.CreateHtmlTextWriter(this.Response.Output));
}
if (EtwTrace.IsTraceEnabled(5, 4))
{
EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RENDER_LEAVE, this._context.WorkerRequest);
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End Render");
}
this.CheckRemainingAsyncTasks(false);
}
}
}
catch (ThreadAbortException exception1)
{
HttpApplication.CancelModuleException exceptionState = exception1.ExceptionState as HttpApplication.CancelModuleException;
if ((((includeStagesBeforeAsyncPoint includeStagesAfterAsyncPoint) (this._context.Handler == this)) ((this._context.ApplicationInstance != null) (exceptionState != null))) !exceptionState.Timeout)
{
this._context.ApplicationInstance.CompleteRequest();
ThreadResetAbortWithAssert();
}
else
{
this.CheckRemainingAsyncTasks(true);
throw;
}
}
catch (ConfigurationException)
{
throw;
}
catch (Exception exception2)
{
PerfCounters.IncrementCounter(AppPerfCounter.ERRORS_DURING_REQUEST);
PerfCounters.IncrementCounter(AppPerfCounter.ERRORS_TOTAL);
if (!this.HandleError(exception2))
{
throw;
}
}
}