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ASP.NET MVC Extensibility
The document discusses the extensibility points of the ASP.NET MVC framework, detailing various components such as routing, controller factories, action invokers, and view engines. It emphasizes the ability to customize numerous aspects of the framework through server-side and client-side validation, custom templates, and filters. Additionally, the document covers practical implementations and scenarios for extending the default functionalities provided by ASP.NET MVC.
ASP.NET MVC Extensibility
- 1. Extending ASP.NET MVCPart1Simone ChiarettaArchitect, Council of the EUhttp://codeclimber.net.nzTwitter: @simonechJune 23rd, 2010
- 2. Who the hellam I?Simone ChiarettaMicrosoft MVP ASP.NETASP InsiderBlogger – http://codeclimber.net.nzItalianALT.NET UG FounderOpenSource developerClimberAll Around Nice GuyDisclaimer:"The viewsexpressed are purelythose of the speaker and may not in anycircumstancesberegarded as stating an official position of the Council"
- 3. AgendaThe default ASP.NETMVC PipelineExtensibilitypoints’ listThe Mostimportantextensibilitypoints
- 4. The DefaultASP.NET MVCPipeline
- 5. The default ASP.NETMVC Pipeline4
- 6. The default componentsURLRouting:Parses the URL, andinstantiate the MvcHandlerController FactoryTakes URL parameters, create controller via reflectionbased on ControllernameAction InvokerInvokes the actionbased on thename, with the filtersbefore and afterViewEngineWebFormsviewengineTemplateRenders a TextBoxalmostforeverythingHtmlHelperHas a bunch of standardmethods
- 7. ASP.NET MVC ISextensibleIfyou don’t likethemIfyouneedsomething elseChangethem
- 8. ASP.NET MVC ISextensibleAlmosteveryaspectof the framework can beextented/replaced
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- 11. Controller ExtensibilityControllerFactoryResponsibleforcreatingControllersActionInvokerInvokesanaction, basedonlyon itsnameActionMethodSelectorAttributeHelps the actioninvoker decide whichactiontoinvokewhen the nameisnotuniqueControllerThe base classforevery controllerActionResultDecideshowtosend the output to the user
- 12. ActionFilterExtensibilityAuthorizationFilterMakessure the currentrequestisallowedActionFiltersExecutedbeforeor after the actionexecutesResultFiltersExecutedbefore or afteranactionresultexecutes
- 13. Binding/ValidationExtensibilityModelBinderPopulates the actionmethodparametersfromthe requestModelValidator ProviderRetrieves the validationrulesServer-sideValidationRulesThe actual server-side validationrule
- 14. ViewExtensibilityViewEngineThe service thattransformsin HTML the data for the userHtmlHelpersUtility functionsthathideaway the generation of some HTML markup or JavaScript codeClient-sideValidationRulesClient-sidevalidationrulesModelMetadata ProviderRetrieves the metadataneededfor the templatedhelpersCustom TemplatesRenders the html toedit/display specifictypes
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- 16. The MostimportantExtensibilitpointsThe onesyouwilldefinitelyuseTheonesyouhaveto start usingThe onesyoumight or mightnotneedtouseThe onesyoumostlikelywillnotwriteyourselfbutprobablyusewrittenbyothers
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- 19. CustomTemplatesWHAT: Renders thehtml toedit/display specifictypesDEFAULT: Everythingis a label or a textboxWHY: Addyourowntocustomizespecificdata-types
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- 22. Server-sideValidationRulesWHAT: Definehow apropertyisvalidated in the server side validationDEFAULT: Required, Length, wrong typeWHY: Addyourownrules
- 23. Server-sideValidationRulesWrite a newValidationAttributeImplementthe IsValidmethodApplyattributetoyourmodelDemo
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- 25. Client-sideValidationRulesWHAT: Definehow apropertyisvalidated in the client-side validationDEFAULT: Client-sidecounterparts of the default server-side validatorsWHY: Addyourownvalidators
- 26. Client-sideValidationRulesFirst make aserver-side validatorMakevalidationlogic in JavaScriptWriteadaptertopushvalidationrulesto client-sideRegistervalidationfunction via JSRegisteradapter in Global.asaxDemo
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- 29. Base ControllerWHAT: Thebase class forevery ControllerDEFAULT: Defaultimplementation of helpermethodsWHY: Extendifyouwanttoenforceyouownconventions
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- 32. HtmlHelpersWHAT: Utility functionsthathideawaythe generation of HTML markup or JavaScript codeDEFAULT: Html.TextBox, Html.Encode, Html.Partial, …WHY: “Ifthereisanif, writeanHelper”
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- 34. RatingIf you likedthis talk, please consider rating it:http://speakerrate.com/talks/3669-asp-net-mvc-extensibility33Disclaimer:"The viewsexpressed are purelythose of the speaker and may not in anycircumstancesberegarded as stating an official position of the Council"
- 35. Extending ASP.NET MVCPart2Simone ChiarettaArchitect, Council of the EUhttp://codeclimber.net.nzTwitter: @simonechJune 23rd, 2010
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- 37. AuthorizationFilterWHAT: Makes surethe current request is allowedDEFAULT: Itisbased on the ASP.NETMembership providerWHY: ChangeifyouwantnottouseASP.NET MVC or ifyouwanttoenhance the routedictionary
- 38. Action FiltersWHAT: Executedbefore or after the action executesDEFAULT: Output cacheWHY: Addyourownbased on yourneeds
- 39. ResultFiltersWHAT: Executed beforeor after an action result executesDEFAULT: No default resultfiltersWHY: Addyourownbased on yourneeds
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- 44. RouteConstraintWHAT: Validates routeparametersDEFAULT: No default implementationWHY: Addyourownwhenneeded
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- 47. RouteHandlerWHAT: Defineshow therequestmustbehandledDEFAULT: Routes the requesttoMvcHandlerWHY: ChangeifyouwantnottouseASP.NET MVC
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- 50. ActionMethodSelectorAttributeWHAT: Helps theaction invoker decide which action to invoke when the name is not uniqueDEFAULT: HttpMethod attributes: decide based on the HttpMethodWHY: Addyourowntosupportdifferentscenarios
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- 53. ActionResultWHAT: Sends theoutput to the userDEFAULT: ViewResult, RedirectResult, FileResult, JsonResult, etc…WHY: Addyourownifyouneedan output notavailable in the default results
- 54. ActionResultCreate a newresultinheritingfrom:ActionResultImplement:ExecuteResultOptionally create anhelpermethod in you “base controller”Demo
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- 56. ModelBinderWHAT: Populates theaction method parameters from the requestDEFAULT: Bindsrequest’s valuesbased on namesWHY: Extendifyouneedtoaddother way ofbinding
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- 60. Controller FactoryWHAT: Responsiblefor creating ControllersDEFAULT: Create aninstance of the Controller via Reflectionbased on itsnameWHY: Changeifyouwantto create the controller in otherways or ifyouwanttoadd some funtionalitiesMost of themainIoC container have a customControllerFactory
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- 63. ActionInvokerWHAT: Invokes anaction, based only on its nameDEFAULT: Call the actionmethod, via reflection, based on itsname, gatheringfilters via attributes and callingthembefore and afterWHY: Changeifyouwanttochange the way methods are called, or wantdifferent way toconfigureFilters
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- 66. ViewEngineWHAT: The servicethat transforms in HTML the data for the userDEFAULT: WebFormviewengineWHY: Changeifyou don’t like the WebFormapproach
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- 69. ModelValidatorProviderWHAT: Retrieves thevalidation rulesDEFAULT: Validationrules are definedwithDataAnnotationattributesWHY: Changeifyouwanttospecifyvalidationrules in otherways (XML, Database, etc…)
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- 72. ModelMetadataProviderWHAT: Retrieves themetadataneededfor the templatedhelpersDEFAULT: Metadata are definedwithDataAnnotationattributesWHY: Changeifyouwanttospecifymetadata in otherways (XML, Database, etc…)
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- 74. Contacts – SimoneChiarettaMSN: simone_ch@hotmail.comBlog:English: http://codeclimber.net.nz/Italian: http://blogs.ugidotnet.org/piyo/Twitter: @simonech73
- 75. RatingIf you likedthis talk, please consider rating it:http://speakerrate.com/talks/3669-asp-net-mvc-extensibility74Disclaimer:"The viewsexpressed are purelythose of the speaker and may not in anycircumstancesberegarded as stating an official position of the Council"
Editor's Notes
- #45 Explainhow route selectionworks
- #61 Ifyou are dealingwith CLR types,gowithoverridingDefaultControllerFactory: youdon’t havetoresolve the controllertypebased on thename and youonlyneedto create theinstance of the controller givenitstype. Alldiscovery and filteringisdoneby the defaultimplementationIfyouwanttochange the namingconventions, or are notdealingwith CLR typesyouhaveto go the hard route and implementIController