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Microsoft.NET体系结构Microsoft.NET是Microsoft公司推出的下一代互联网软件和服务战略,它“代表了一个集合、一个环境、一个可以作为平台支持下一代Internet的可编程结构”.NET的核心是WebService技术12TechEd2002*TechEd2002*Sessiontime:75minutesN-TierReview10Architecture10TransactionsontheWeb20QueuedWebServiceCalls20Q/A15TechEd2002*Let’sbeginwithaquickreviewofN-Tierarchitectures.Mostpeoplethinkof3maintiers,Presentation,BusinessServicesandDataServices.Eachtierseekstoprovideacleanseparationoftheinternalsfromtheinterfacethatthetiersaboveitseektouse.Asourworldbecomesmoreandmoreconnectedthisisbecomingevenmoreimportant.Presentationservicesfocusontheuserexperience.Theinterfacecouldbeanythingfromaphonetoawebbrowserorarichclient.Eachoftheseclientsmustbeabletocommunicatetothebusinessservicestiertoobtaindatarequiredforrenderingtheuserinterfaceandfortakingactionbasedonuserrequests.TheBusinessservicelayermustbeabletoapplybusinessrulesandlogicsafelyandsecurely.TheDataserviceslayerprovidesdatatothebusinessserviceslayerandprotectsthedatafromcatastrophicfailures.Anotherkeyjobofthedataserviceslayeristoabstractthespecificsofthedatastoreallowingthebusinessservicestotransparentlyworkwithdifferentdatastoreproviders.TechEd2002*Thepreviousgenerationofn-tierarchitecturelaunchedin2000wasWindowsDNA.MostofyouarefamiliarwiththisbecauseyouhavebeenbuildingapplicationsbasedontheWindowsDNAmodel.TechEd2002*Sessiontime:75minutesN-TierReview10Architecture10TransactionsontheWeb20QueuedWebServiceCalls20Q/A15TechEd2002*KeyConceptsApplicationrequirementsforServerbasedcodearedifferentMoreplumbingrequirementsthatdistractfromprovidingapplicationservicesNarrativeThinkofadeveloperwhowritesverygoodcalendaringandschedulingprogram,buthasspentanentirecareerprogrammingforthe
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