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;
}
}
}
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