Building Business Centric Applications with Silverlight 3 and .NET RIA Services Brad AbramsProduct Unit managerMicrosofthttp://blogs.msdn.com/bradaTwitter: @brada

Vision and GoalsSimplify RIA-style application developmentn-tier is hard, and un-naturalFocus on data-driven appsBring ASP.NET-style productivity to RIA developmentBuilding blocks for data, security, etc.Focus on scenarios

Value PropositionsFocus on data in an end-to-end mannerA unified story for client and server developmentA prescriptive framework that targets key scenarios, and leads the common developer to a pit of success

ServiceRich Internet ApplicationBrowserApplicationDBOther ApplicationsA Unified Story for Client and ServerClient is an extension of the serverA single logical applicationPresentationLogicData Access LayerAppLogicHTMLNetworkServices

A Prescriptive PatternDomainServiceStateless CRUD + App Logicclass LibraryServiceIQueryable<Books> GetBooks()IQueryable<Book> SearchBooks(string)void AddBook(Book)void RequestBook(Book)Validation and authorization rules, Application workflows, …Data Modelclass BookDomainContextStateful view + Bindable Dataclass LibraryContextEntityList<Book> Books { get }EntityQuery<Book> GetBooksQuery()EntityQuery<Book> SearchBooksQuery(string)void RequestBook(Book)class BookData members + Validationvoid RequestBook()Data Model +Metadata +Shared CodeServicesRich Internet ApplicationPresentationLogicData Access LayerAppLogicNetworkDomainContextDataServiceDBUnder the covers infrastructure

A Single Pattern that Scales and GrowsSupport for multiple presentation tiers and data access technologiesDatabasesADO.NET,ORMs (LTS, EF, …).NET ClientsSilverlight, WPFStandards ClientsJavaScriptAppLogicCLR Lists/ObjectsRepository(nHibernate, …)Server RenderingHTML, SEO,Printing, …SOAP, XML, JSON,BinaryServicesREST/SOAP(Azure, …)ServicesWCFUnit Test Code

SummaryRIA Services focuses on writing n-tier apps by treating them as one logical applicationStill get n-tier goodness from the architecture/pattern without the plumbing getting in your wayRIA Services provides a pattern for encapsulating application logic on the middle tier that can be useful in a variety of scenariosDAL-agnosticMultiple presentation layers

Roadmap and ResourcesFirst public preview at MIX ’09http://code.msdn.microsoft/riaservicesLinks to bits, docs, samples, forumsNext big release is at PDC ‘09Slides + sample codehttp://www.nikhilk.netOther blogshttp://blogs.msdn.com/brada

Extra: ViewModel

Patterns for Separating UI and LogicMVC, MVP, ViewModel, …General approachSeparate interaction logic from viewDecouple components of appMotivationsLoosely coupled building blocksDesigner-developer workflowGreater degree of testabilityUser InterfaceInteraction LogicData Model

ViewModel PatternMVVM (Model – View – ViewModel), Presentation ModelBasic ideaView model encapsulates application behavior independent of viewView is responsible for rendering and user inputLeverage data-binding and commanding to hook up view to its view model

Hello WorldFrom code-behind to ViewModeldemo

Interaction Logic in Code-behindViewXAMLData ModelCode-BehindEvent Handlers

Interaction Logic in View ModelViewXAMLCode-BehindProperty change and other event notificationsData-binding and commandsView ModelData ModelState + Operations + Notifications

question & answer

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