微软aspnet设计应用外文翻译文献

《微软aspnet设计应用外文翻译文献》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、IntroductiontoASP.NETDevelopmentToovercometheperformanceandscalabilityproblemsthatCGIbrings,Microsoftdevelopedanewwayfordeveloperstobuildscalableapplications.ThishighperformancealternativeiscalledtheInternetServerApplicationProgrammingInterface(ISAPI)eInsteadofhousingfunctionalityinexecutablef

2、iles,ISAPIusesDLLs.UsingDLLsinsteadofexecutableprogramshassomedefiniteperformanceandscalabilityadvantagesTheISAPIextensioncouldalsobecalledwithargumentsthatwillallowasingleISAPIextensiontoperformmultipletasks.JustasintheCGIexample,thedirectorymusthaveexecutepermissionsenabled,ortheDLLwillbedow

3、nloadedtotheclientratherthanrunontheserver.ISAPIextensionsaretypicallyusedtoprocessclientrequestsandoutputaresponseasHTML,whichisverysimilartothewayCGIprogramsareused.ISAPIfiltersperformafunctionthatcan5tbedirectlyduplicatedwithCGIapplications.ISAPIfiltersareneverexplicitlycalled;instead,theya

4、recalledbyIISinresponsetocertaineventsinthelifeofarequest.ThedevelopercanrequestthatanISAPIfilterbecalledwheneveranyofthefollowingeventsoccur:1•Whentheserverhaspreprocessedtheclientheaders2.Whentheserverauthenticatestheclient3.WhentheserverismappingalogicalURLtoaphysicalURL4.Beforerawdataissen

5、tfromtheclienttotheserver5.Afterrawdataissentfromtheclienttotheserverbutbeforetheserverprocessesit6.Whentheserverlogsinformation7.WhenthesessionisendingAswithanyfilter,ISAPIfiltersshouldrequestonlythenotificationsitrequiresandprocessthemasquicklyaspossible.OneofthemorecommonusesofISAPIfiltersi

6、stoprovidecustomauthentication.AnotheruseistomodifytheHTMLthatwillbesenttothedien匸Forexample,anISAPIfiltercouldbeusedtochangethebackgroundcolorofeachpage.BecauseISAPIfiltersaren^tnearlyascommonasISAPIextensions,Iworftcoverthemanyfurtherinthisbook.IfyouwanttolearnmoreaboutISAPIextensions,youcan

7、checkoutmybookInsideServer-BasedApplications(MicrosoftPress,1999).ISAPIspecifiesseveralentry-pointfunctionsthatmustbeexportedfromtheDLL.Usingtheseentrypoints,IIScanloadtheDLL;callthefunctionsthatitimplements,passinginparametersasrequire