asp.net Page事件处理管道
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我们知道页面就是一个处理程序，里面的实现非常复杂，网上也有很多资料讲到asp.net的管道处理，有关page的事件处理也不少；这里我就page的事件处理结果如图：
这里的总结来至asp.net本质论。我们也知道page的处理都集中在一个ProcessRequest方法中，该方法最终主要还是调用ProcessRequestMain方法。其主要实现如下：
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"); } this.PerformPreInit(); if (context.TraceIsEnabled) { this.Trace.Write("aspx.page", "End PreInit"); } if (context.TraceIsEnabled) { this.Trace.Write("aspx.page", "Begin Init"); } this.InitRecursive(null); 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"); } this.LoadAllState(); if (context.TraceIsEnabled) { this.Trace.Write("aspx.page", "End LoadState"); this.Trace.Write("aspx.page", "Begin ProcessPostData"); } this.ProcessPostData(this._requestValueCollection, true); 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"); } this.LoadRecursive(); 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"); } this.RaiseChangedEvents(); if (context.TraceIsEnabled) { this.Trace.Write("aspx.page", "End Raise ChangedEvents"); this.Trace.Write("aspx.page", "Begin Raise PostBackEvent"); } this.RaisePostBackEvent(this._requestValueCollection); 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"); } this.PreRenderRecursiveInternal(); 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"); } this.SaveAllState(); 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 (str != null) { this.ExportWebPart(str); } else { this.RenderControl(this.CreateHtmlTextWriter(this.Response.Output)); } if (context.TraceIsEnabled) { this.Trace.Write("aspx.page", "End Render"); } this.CheckRemainingAsyncTasks(false); } } } catch (ConfigurationException) { throw; } }在这个方法中有两段代码比较有意思 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");
}
this.LoadAllState();
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End LoadState");
this.Trace.Write("aspx.page", "Begin ProcessPostData");
}
this.ProcessPostData(this._requestValueCollection, true);
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End ProcessPostData");
}
}
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "Begin PreLoad");
}
this.OnPreLoad(EventArgs.Empty);
和
this.LoadRecursive();
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");
}
this.RaiseChangedEvents();
if (context.TraceIsEnabled)
{
this.Trace.Write("aspx.page", "End Raise ChangedEvents");
this.Trace.Write("aspx.page", "Begin Raise PostBackEvent");
}
this.RaisePostBackEvent(this._requestValueCollection);
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);
整过post过来的请求与get相比就多了这中间一点处理，我们也知道page在处理post请求时需要处理数据的加载IPostBackDataHandler和事件的触发IPostBackEventHandler.
所以为什么这回分成两段就比较好理解了。
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