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1、┊┊┊┊┊┊┊┊┊┊┊┊┊装┊┊┊┊┊订┊┊┊┊┊线┊┊┊┊┊┊┊┊┊┊┊┊┊ASP.NETTechnique1.BuildingASP.NETPagesASP.NETandthe.NETFrameworkASP.NETispartofMicrosoft'soverall.NETframework,whichcontainsavastsetofprogrammingclassesdesignedtosatisfyanyconceivableprogrammingneed.Inthefollowingtwose
2、ctions,youlearnhowASP.NETfitswithinthe.NETframework,andyoulearnaboutthelanguagesyoucanuseinyourASP.NETpages.The.NETFrameworkClassLibraryImaginethatyouareMicrosoft.Imaginethatyouhavetosupportmultipleprogramminglanguages—suchasVisualBasic,JScript,andC++.Agrea
3、tdealofthefunctionalityoftheseprogramminglanguagesoverlaps.Forexample,foreachlanguage,youwouldhavetoincludemethodsforaccessingthefilesystem,workingwithdatabases,andmanipulatingstrings.Furthermore,theselanguagescontainsimilarprogrammingconstructs.Everylangua
4、ge,forexample,canrepresentloopsandconditionals.EventhoughthesyntaxofaconditionalwritteninVisualBasicdiffersfromthesyntaxofaconditionalwritteninC++,theprogrammingfunctionisthesame.Finally,mostprogramminglanguageshavesimilarvariabledatatypes.Inmostlanguages,y
5、ouhavesomemeansofrepresentingstringsandintegers,forexample.Themaximumandminimumsizeofanintegermightdependonthelanguage,butthebasicdatatypeisthesame.Maintainingallthisfunctionalityformultiplelanguagesrequiresalotofwork.Whykeepreinventingthewheel?Wouldn'titbe
6、easiertocreateallthisfunctionalityonceanduseitforeverylanguage?The.NETFrameworkClassLibrarydoesexactlythat.Itconsistsofavastsetofclassesdesignedtosatisfyanyconceivableprogrammingneed.Forexample,the.NETframeworkcontainsclassesforhandlingdatabaseaccess,workin
7、gwiththefilesystem,manipulatingtext,andgeneratinggraphics.Inaddition,itcontainsmorespecializedclassesforperformingtaskssuchasworkingwithregularexpressionsandhandlingnetworkprotocols.The.NETframework,furthermore,containsclassesthatrepresentallthebasicvariabl
8、edatatypessuchasstrings,integers,bytes,characters,andarrays.共18页第16页┊┊┊┊┊┊┊┊┊┊┊┊┊装┊┊┊┊┊订┊┊┊┊┊线┊┊┊┊┊┊┊┊┊┊┊┊┊Mostimportantly,forpurposesofthisbook,the.NETFrameworkClassLibrarycontainsclassesforbuildingAS
