ASP.NET 页面对象模型-外文翻译

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1、原文摘自：lvarJacobson.Object-OrientedSoftwareEngineering.第1版.北京：人民邮电出版社，2005.10外文资料原文[ASP.NETPAGEOBJECTMODEL:]Summary:LearnabouttheeventingmodelbuiltaroundASP.NETWebpagesandthevariousstagesthataWebpageexperiencesonitswaytoHTML.TheASP.NETHTTPruntimegovernsthepipelineofobjectsthattransf

2、ormtherequestedURLintoalivinginstanceofapageclassfirst,andintoplainHTMLtextnext.Discovertheeventsthatcharacterizethelifecycleofapageandhowcontrolandpageauthorscanintervenetoalterthestandardbehavior.(6printedpages)Introduction:EachrequestforaMicrosoft®ASP.NETpagethathitsMicrosoft®I

3、nternetInformationServices(IIS)ishandedovertotheASP.NETHTTPpipeline.TheHTTPpipelineisachainofmanagedobjectsthatsequentiallyprocesstherequestandmakethetransitionfromaURLtoplainHTMLtexthappen.TheentrypointoftheHTTPpipelineistheHttpRuntimeclass.TheASP.NETinfrastructurecreatesoneinsta

4、nceofthisclasspereachAppDomainhostedwithintheworkerprocess(rememberthattheworkerprocessmaintainsonedistinctAppDomainpereachASP.NETapplicationcurrentlyrunning).TheHttpRuntimeclasspicksupanHttpApplicationobjectfromaninternalpoolandsetsittoworkontherequest.Themaintaskaccomplishedbyth

5、eHTTPapplicationmanagerisfindingouttheclassthatwillactuallyhandletherequest.Whentherequestisforan.aspxresource,thehandlerisapagehandler—namely,aninstanceofaclassthatinheritsfromPage.Theassociationbetweentypesofresourcesandtypesofhandlersisstoredintheconfigurationfileoftheapplicati

6、on.Moreexactly,thedefaultsetofmappingsisdefinedinthesectionofthemachine.configfile.However,theapplicationcancustomizethelistofitsownHTTPhandlersinthelocalweb.configfile.ThelinebelowillustratesthecodethatdefinestheHTTPhandlerfor.aspxresources.

7、type="System.Web.UI.PageHandlerFactory"/>Anextensioncanbeassociatedwithahandlerclass,ormoreingeneral,withahandlerfactoryclass.Inallcases,theHttpApplicationobjectinchargefortherequestgetsanobjectthatimplementstheIHttpHandlerinterface.Iftheassociationresource/classisresolvedintermso

8、faHTTPhandler,thenthereturnedclas