Asp.Net原理Version3.0_页面声明周期

时间:2021-03-18 10:12:49
 
Asp.Net原理Version3.0_页面声明周期
 
 
 
Asp.Net原理Version3.0_页面声明周期
 
 
 
 
 
Asp.Net原理Version3.0_页面声明周期

相关源码

页面的Process方法

 // System.Web.UI.Page
 private void ProcessRequest(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint)
 {
     if (includeStagesBeforeAsyncPoint)
     {
         //调用子类的方法(这是个虚方法),1,创建页面控件树
         this.FrameworkInitialize();
         base.ControlState = ControlState.FrameworkInitialized;
     }
     bool flag = this.Context.WorkerRequest is IIS7WorkerRequest;
     try
     {
         try
         {
             if (this.IsTransacted)
             {
                 this.ProcessRequestTransacted();
             }
             else
             {
                 //页面声明周期的主要部分
                 this.ProcessRequestMain(includeStagesBeforeAsyncPoint, includeStagesAfterAsyncPoint);
             }
             if (includeStagesAfterAsyncPoint)
             {
                 flag = false;
                 this.ProcessRequestEndTrace();
             }
         }
         catch (ThreadAbortException)
         {
             try
             {
                 if (flag)
                 {
                     this.ProcessRequestEndTrace();
                 }
             }
             catch
             {
             }
         }
         finally
         {
             if (includeStagesAfterAsyncPoint)
             {
                 this.ProcessRequestCleanup();
             }
         }
     }
     catch
     {
         throw;
     }
 }

ProcessRequestMain方法

 // System.Web.UI.Page
 private void ProcessRequestMain(bool includeStagesBeforeAsyncPoint, bool includeStagesAfterAsyncPoint)
 {
     try
     {
         HttpContext context = this.Context;
         string text = null;
         if (includeStagesBeforeAsyncPoint)
         {
             if (this.IsInAspCompatMode)
             {
                 AspCompatApplicationStep.OnPageStartSessionObjects();
             }
             if (this.PageAdapter != null)
             {
                 this._requestValueCollection = this.PageAdapter.DeterminePostBackMode();
             }
             else
             {
                 this._requestValueCollection = this.DeterminePostBackMode();
             }
             string text2 = string.Empty;
             if (this.DetermineIsExportingWebPart())
             {
                 if (!RuntimeConfig.GetAppConfig().WebParts.EnableExport)
                 {
                     throw new InvalidOperationException(SR.GetString("WebPartExportHandler_DisabledExportHandler"));
                 }
                 text = this.Request.QueryString["webPart"];
                 if (string.IsNullOrEmpty(text))
                 {
                     throw new InvalidOperationException(SR.GetString("WebPartExportHandler_InvalidArgument"));
                 }
                 if (string.Equals(this.Request.QueryString["scope"], "shared", StringComparison.OrdinalIgnoreCase))
                 {
                     );
                 }
                 string text3 = this.Request.QueryString["query"];
                 if (text3 == null)
                 {
                     text3 = string.Empty;
                 }
                 this.Request.QueryStringText = text3;
                 context.Trace.IsEnabled = false;
             }

             //2,确定IsCallback值
             if (this._requestValueCollection != null)
             {
                 if (this._requestValueCollection["__VIEWSTATEENCRYPTED"] != null)
                 {
                     this.ContainsEncryptedViewState = true;
                 }
                 text2 = this._requestValueCollection["__CALLBACKID"];
                 if (text2 != null && this._request.HttpVerb == HttpVerb.POST)
                 {
                     this._isCallback = true;
                 }
                 else
                 {
                     if (!this.IsCrossPagePostBack)
                     {
                         VirtualPath virtualPath = null;
                         if (this._requestValueCollection["__PREVIOUSPAGE"] != null)
                         {
                             try
                             {
                                 virtualPath = VirtualPath.CreateNonRelativeAllowNull(Page.DecryptString(this._requestValueCollection["__PREVIOUSPAGE"]));
                             }
                             catch
                             {
                                 ] = true;
                             }
                             if (virtualPath != null && virtualPath != this.Request.CurrentExecutionFilePathObject)
                             {
                                 ] = true;
                                 this._previousPagePath = virtualPath;
                             }
                         }
                     }
                 }
             }
             if (this.MaintainScrollPositionOnPostBack)
             {
                 this.LoadScrollPosition();
             }
             if (context.TraceIsEnabled)
             {
                 this.Trace.Write("aspx.page", "Begin PreInit");
             }
             , ))
             {
                 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_INIT_ENTER, this._context.WorkerRequest);
             }

             //3.1初始化PreInit
             this.PerformPreInit();
             , ))
             {
                 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");
             }
             , ))
             {
                 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_INIT_ENTER, this._context.WorkerRequest);
             }
             //3.2递归初始化,因为要初始化树,所以用递归
             this.InitRecursive(null);
             , ))
             {
                 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");
             }
             //3.3,初始化完成
             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");
                 }
                 , ))
                 {
                     EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_VIEWSTATE_ENTER, this._context.WorkerRequest);
                 }
                 //4.1,加载ViewState
                 this.LoadAllState();
                 , ))
                 {
                     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");
                 }
                 , ))
                 {
                     EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_POSTDATA_ENTER, this._context.WorkerRequest);
                 }
                 //4.2,处理回发数据
                 this.ProcessPostData(this._requestValueCollection, true);
                 , ))
                 {
                     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");
             }
             //5.1页面预加载
             this.OnPreLoad(EventArgs.Empty);
             if (context.TraceIsEnabled)
             {
                 this.Trace.Write("aspx.page", "End PreLoad");
             }
             if (context.TraceIsEnabled)
             {
                 this.Trace.Write("aspx.page", "Begin Load");
             }
             , ))
             {
                 EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_LOAD_ENTER, this._context.WorkerRequest);
             }
             //5.2页面递归加载
             this.LoadRecursive();
             , ))
             {
                 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");
                 }
                 //5.3第二次尝试加载回发数据
                 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");
                 }
                 , ))
                 {
                     EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_POST_DATA_CHANGED_ENTER, this._context.WorkerRequest);
                 }
                 //6.1,触发Change事件
                 this.RaiseChangedEvents();
                 , ))
                 {
                     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");
                 }
                 , ))
                 {
                     EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RAISE_POSTBACK_ENTER, this._context.WorkerRequest);
                 }
                 //6.2,触发点击事件
                 this.RaisePostBackEvent(this._requestValueCollection);
                 , ))
                 {
                     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");
             }
             //5.3,页面加载完成
             this.OnLoadComplete(EventArgs.Empty);
             if (context.TraceIsEnabled)
             {
                 this.Trace.Write("aspx.page", "End LoadComplete");
             }
             if (this.IsPostBack && this.IsCallback)
             {
                 this.PrepareCallback(text2);
             }
             else
             {
                 if (!this.IsCrossPagePostBack)
                 {
                     if (context.TraceIsEnabled)
                     {
                         this.Trace.Write("aspx.page", "Begin PreRender");
                     }
                     , ))
                     {
                         EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_RENDER_ENTER, this._context.WorkerRequest);
                     }

                     //7,递归预渲染
                     this.PreRenderRecursiveInternal();
                     , ))
                     {
                         EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_PRE_RENDER_LEAVE, this._context.WorkerRequest);
                     }
                     if (context.TraceIsEnabled)
                     {
                         this.Trace.Write("aspx.page", "End PreRender");
                     }
                 }
             }
         }
         if (this._asyncInfo == null || this._asyncInfo.CallerIsBlocking)
         {
             this.ExecuteRegisteredAsyncTasks();
         }
         this._request.ValidateRawUrl();
         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");
                     }
                     , ))
                     {
                         EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_SAVE_VIEWSTATE_ENTER, this._context.WorkerRequest);
                     }
                     //8,保存页面状态到ViewState
                     this.SaveAllState();
                     , ))
                     {
                         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");
                     }
                     , ))
                     {
                         EtwTrace.Trace(EtwTraceType.ETW_TYPE_PAGE_RENDER_ENTER, this._context.WorkerRequest);
                     }
                     if (text != null)
                     {
                         this.ExportWebPart(text);
                     }
                     else
                     {
                         //9,渲染出HTML
                         this.RenderControl(this.CreateHtmlTextWriter(this.Response.Output));
                     }
                     , ))
                     {
                         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 ex2)
     {
         HttpApplication.CancelModuleException ex = ex2.ExceptionState as HttpApplication.CancelModuleException;
         if (!includeStagesBeforeAsyncPoint || !includeStagesAfterAsyncPoint || this._context.Handler != this || this._context.ApplicationInstance == null || ex == null || ex.Timeout)
         {
             this.CheckRemainingAsyncTasks(true);
             throw;
         }
         this._context.ApplicationInstance.CompleteRequest();
         Page.ThreadResetAbortWithAssert();
     }
     catch (ConfigurationException)
     {
         throw;
     }
     catch (Exception e)
     {
         PerfCounters.IncrementCounter(AppPerfCounter.ERRORS_DURING_REQUEST);
         PerfCounters.IncrementCounter(AppPerfCounter.ERRORS_TOTAL);
         if (!this.HandleError(e))
         {
             throw;
         }
     }
 }