23个设计模式C#代码.docx

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1、/AbstractFactory/Intent:Provideaninterfaceforcreatingfamiliesofrelatedor/dependentobjectswithoutspecifyingtheirconcreteclasses”./Forfurtherinformation,readDesignPatterns,p87,Gammaetal.,/Addison-Wesley,ISBN:0-201-63361-2*Notes:* Whentheconstructionneededinvolvesmanyobjects,possibleorganised* inmulti-

2、facetedarrangements,theentireconstructioncanbedelegated* toanabstractfactory.Thisexposesstandardisedcreationfunctionality* whichcanbecustomisedinconcreteimplementationtosuityourspecific* needs,andavoidembeddingthisinformationinhigherlevelcode-it* justneedstoknowhowtocalltheabstractfactory.* Inthissa

3、mple,wehaveaframeworkwiththreeabstractoperatingclasses,* calledDPDocument,DPWorkspaceandDPViewandoneabstractconstruction* class,calledDPFactory.napplication-levelclass,calledDPApplication* isresponsibleforconstruction.* Wehaveaseriesofapp1ication-1eve1operatingclassesderivedfromthis* framework-MyDoc

4、ument,MyWorkspaceandMyView.Fordesignreasonswe* assumewewishtoinstantiatethesefrominsideDPApplication.Asthere* aremultipleobjectsneededandtheycouldbearrangedindifferent* lattices,weuseafactory,MyFactory(inourexample,thereareall* simplesiblings),whichiscalledinsideDPApplication.*/namespaceAbstractFact

5、oryDesignPatternusingSystem;/Theseclassescouldbepartofaframework,/whichwewillcallDP/=abstractclassDPDocumentabstractpublicvoidDump();abstractclassDPWorkspaceabstractpublicvoidDump();DPViewpublicvoidDump();abstractclass(abstractabstractclassabstractabstractabstractDPFactorypublicDPDocumentCreateDocum

6、ent();publicDPViewCreateViewO;publicDPWorkspaceCreateWorkspaceO;abstractclassDPApplication(protectedDPDocumentdoc;protectedDPWorkspaceworkspace;protectedDPViewview;publicvoidConstructObjects(DPFactoryfactory)(/Createobjectsasneededdoc=factory.CreateDocumentO;workspace=factory,CreateWorkspaceO;view=f

7、actory.CreateViewO;publicvoidDumpState()(if(doc!-null)doc.Dump();if(workspace!=null)workspace.Dump();if(view!=null)view.DumpO；)/TheseclassescouldbepartofanapplicationclassMyApplication:DPApplicationMyFactorymyFactory=newMyFaCtory();overridepublicvoidDump()(Console.Write1.ine(,MyApplicationexists);pu

8、blicvoidCreateFamilyO(MyFactorymyFactory=newMyFactoryO;ConstructObjects(myFactory);)classMyDocument:DPDocumentpublicMyDocumentO(Console.Write1.ine(,inMyDocumentconstructor);overridepublicvoidDump()(Console.Write1.ine(,MyDocumentexists);)classMyWorkspace:DPWorkspaceConsole.Write1.ine(zzMyWorkspaceexi

9、sts);classMyView:DPViewoverridepublicvoidDump()Console.Write1.ine(,MyViewexists);classMyFactory:DPFactory(overridepublicDPDocumentCreateDocument()(returnnewMyDoCUment();overridepublicDPWorkspaceCreateWorkspace()(returnnewMyWorkspace();)overridepublicDPViewCreateViewOreturnnewMyViewO;IIIIIISummarydes

10、criptionforClient.IllpublicclassClient(publicstaticintMain(stringargs)(MyApplicationmyApplication=newMyApplicationO；myApplication.CreateFamilyO；myApplication.DumpStateO；returnO;/Adapter/Intent:Converttheinterfaceofaclassintoanotherinterface/clientsexpect.Adapterletsclassesworktogetherthatcouldn,t/ot

11、herwisebecauseofincompatibleinterfaces./Forfurtherinformation,readDesignPatterns”,pl39,Gammaetal.,/Addison-Wesley,ISBN:0-201-63361-2*Notes:* Adaptersareoftenusedwhenclientcodeiswrittentoexpectclasses* fromoneframework,anditmeanttoworkwithclassesfromatotally* differentframework.Assumeyoucannotchanget

12、hecodeofeitherframework.* thesolutionisforyoutowriteanadapter,whichappearslikea*nativeclasstoeachframework.* Therearetwodifferenttypesofadapters-classadapterandobject* adapter.Classadaptersarebasedonmultipleinheritance-specifically* theinterfaceofthetargetclassandtheimplementationoftheadaptee.* Unfo

13、rtunatelyC#supportsmultipleinheritanceforinterfacesbutnot* forclasses.Objectadaptersderivefromthetarget(singleinheritance)* andmaintainaprivateinstanceoftheadoptee.* Thesamplecodehereshowsanobjectadapter.Wehaveaclasscalled* FrameworkYAdapteewhichwewishtouse,yetthe(bulkof)theclientcode* (inGenericCli

14、entCode)iswrittentoexpectaclasscalledFrameworkXTarget.* TosolvetheprobelmwecreateanAdapterclass,whichitaFrameworkXTarget* totheclient,andcallsFrameworkYAdaptee.*/namespaceAdaPteJDeSignPaXternusingSystem;classFrameworkXTargetvirtualpublicvoidSomeRequest(intx)(/normalimplementationofSomeRequestgoesher

15、eclassFrameworkYAdaptee(publicvoidQuiteADifferentRequest(stringstr)(Console.Write1.ine(zzQuiteADifferentRequest=0,str);)classOurAdapter:FrameworkXTarget(privateFrameworkYAdapteeadaptee=newFrameworkYAclaptee();overridepublicvoidSomeRequest(inta)(stringb;b=a.ToStringO；adaptee.QuiteADifferentRequest(b);IIIIIISummarydescriptionforClient.IllpublicclassClientvoidGe