.NET RIA Services Architecture Overview

Building Business Centric Applications with Silverlight 3 and .NET RIA Services
Brad Abrams
Product Unit manager
Microsoft
http://blogs.msdn.com/brada
Twitter: @brada

Vision and Goals
Simplify RIA-style application development
n-tier is hard, and un-natural
Focus on data-driven apps
Bring ASP.NET-style productivity to RIA development
Building blocks for data, security, etc.
Focus on scenarios

Value Propositions
Focus on data in an end-to-end manner
A unified story for client and server development
A prescriptive framework that targets key scenarios, and leads the common developer to a pit of success

Service
Rich Internet Application
Browser
Application
DB
Other Applications
A Unified Story for Client and Server
Client is an extension of the server
A single logical application
Presentation
Logic
Data Access Layer
App
Logic
HTML
Network
Services

A Prescriptive Pattern
DomainService
Stateless CRUD + App Logic
class LibraryService
IQueryable<Books> GetBooks()
IQueryable<Book> SearchBooks(string)
void AddBook(Book)
void RequestBook(Book)
Validation and authorization rules,
Application workflows, …
Data Model
class Book
DomainContext
Stateful view + Bindable Data
class LibraryContext
EntityList<Book> Books { get }
EntityQuery<Book> GetBooksQuery()
EntityQuery<Book> SearchBooksQuery(string)
void RequestBook(Book)
class Book
Data members + Validation
void RequestBook()
Data Model +
Metadata +
Shared Code
Services
Rich Internet Application
Presentation
Logic
Data Access Layer
App
Logic
Network
DomainContext
Data
Service
DB
Under the covers infrastructure

A Single Pattern that Scales and Grows
Support for multiple presentation tiers and data access technologies
Databases
ADO.NET,
ORMs (LTS, EF, …)
.NET Clients
Silverlight, WPF
Standards Clients
JavaScript
App
Logic
CLR Lists/Objects
Repository
(nHibernate, …)
Server Rendering
HTML, SEO,
Printing, …
SOAP, XML, JSON,
Binary
Services
REST/SOAP
(Azure, …)
Services
WCF
Unit Test Code

Summary
RIA Services focuses on writing n-tier apps by treating them as one logical application
Still get n-tier goodness from the architecture/pattern without the plumbing getting in your way
RIA Services provides a pattern for encapsulating application logic on the middle tier that can be useful in a variety of scenarios
DAL-agnostic
Multiple presentation layers

Roadmap and Resources
First public preview at MIX ’09
http://code.msdn.microsoft/riaservices
Links to bits, docs, samples, forums
Next big release is at PDC ‘09
Slides + sample code
http://www.nikhilk.net
Other blogs
http://blogs.msdn.com/brada

Extra: ViewModel

Patterns for Separating UI and Logic
MVC, MVP, ViewModel, …
General approach
Separate interaction logic from view
Decouple components of app
Motivations
Loosely coupled building blocks
Designer-developer workflow
Greater degree of testability
User Interface
Interaction Logic
Data Model

ViewModel Pattern
MVVM (Model – View – ViewModel), Presentation Model
Basic idea
View model encapsulates application behavior independent of view
View is responsible for rendering and user input
Leverage data-binding and commanding to hook up view to its view model

Hello WorldFrom code-behind to ViewModel
demo

Interaction Logic in Code-behind
View
XAML
Data Model
Code-Behind
Event Handlers

Interaction Logic in View Model
View
XAML
Code-Behind
Property change and other event notifications
Data-binding and commands
View Model
Data Model
State + Operations + Notifications

question & answer

Required Slide
© 2009 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

.NET RIA Services Architecture Overview

by brada on Sep 29, 2009

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.NET RIA Services Architecture Overview — Presentation Transcript