apresentação do Nuno Godinho no evento RIAPT de dia 16 de Janeiro.

1. Developing Line-of-Business
Applications with Microsoft Silverlight
Nuno Godinho
Nuno.Godinho@sapo.pt

2. Agenda
 Introduction
 Recommended Pattern
 Communications
 Beyond the Browser
 Extensibility
 Q&A

3. About Me
Nuno Filipe Godinho
Independent Consultant
Mail: Nuno.Godinho@sapo.pt
Nuno.Godinho@itech4all.com
Blogs: http://pontonetpt.com/blogs/nunogodinho
http://xamlpt.com/blogs/nunogodinho
http://weblogs.asp.net/nunogodinho
http://msmvps.org/blogs/nunogodinho
Twitter: @NunoGodinho

4. Agenda
 Introduction
 Recommended Pattern
 Communications
 Beyond the Browser
 Extensibility
 Q&A

5. Introduction
Problem Statement
 Problems
◦ N-Tier
◦ Controls
◦ Rich Text Support
◦ Multi-language Support
◦ Customer Devices Interaction
◦ Communications
◦ Extensibility
◦ Offline Support
◦ Interoperability

6. Introduction
Challenges using N-Tier applications
 LoB applications use data that needs to flow across tiers
 Created and used through basic CRUD operations
 In an internet application, there is a trust boundary between
the client and the mid-tier server
 Important to have a well defined and secured resources that
are available to the client tier and also what operations are
permitted

7. Introduction
Challenges using N-Tier applications
 The validation needs to run on Client and On Server as well as
on Mid-Tiers
 Common validation across the tiers
 Services that may be shared with other applications

9. Introduction
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

10. Introduction
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

11. Introduction
Value Propositions
 Simplify application development across tiers and trust
boundary
◦ Provides a set of tools to build the multiple tiers of an application
together
◦ Application logic remains aware of tier and trust boundaries
◦ Uses the end-to-end flow of data and metadata described earlier
◦ Code generation and shared code
 Enhance the experience by providing multiple choices for sharing
logic while respecting tier and trust boundaries

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

13. Introdution
Value Propositions
 Define and support a pattern for exposing a set of operations
on resources
 DomainService
◦ Define a set of operations on resources
 Framework and Tools
◦ Collaborate to generate code for a corresponding client-tier
◦ Services for authentication and user settings can be used out-of-the
box

14. Introduction
A Prescriptive Pattern
Services
Rich Internet Application
Presentation Domain Network
Domain App Data Access
Logic Context Service Logic Layer
Under the covers infrastructure
DB

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

16. Line-of-Business Application

17. Agenda
 Introduction
 Recommended Pattern
 Communications
 Beyond the Browser
 Extensibility
 Q&A

18. Recommended Pattern

19. Recommended Pattern
MVVM
 Why?
◦ Separation of concerns
◦ Better Workflow between Developer and Designer
◦ Easier Testability
 Why not MVC?
◦ We need to have access to the Code-Behind and MVC doesn’t support
that, only Code-Behind Pattern does, but doesn’t delivers easy
separation of concerns

20. Recommended Pattern
MVVM
 Display data in Controls
 UI Friendly Entities, UI State, Actions
 Entities representing data

21. MVVM Implementation in Silverlight

22. Agenda
 Introduction
 Recommended Pattern
 Communications
 Beyond the Browser
 Extensibility
 Q&A

23. Communication
Unified Programming Model
ASMX & WSE .NET Remoting
Interop Extensibility
with other Location
Platforms & WS-* transparency
Attribute- Message-
Based Oriented
Programming REST / HTTP Programming
Programming
Enterprise System.Messaging
Services
HTTP Services

24. Communications
Windows Communication Foundation (WCF)

25. Communications
WCF RIA Services
 Framework, tools and services with prescriptive pattern for n-
tier applications
Trust
Boundary
Web
Service
Data
Access App App
View
Layer Logic Logic
(DAL)
Database

26. Communications
WCF RIA Services
 Design-time view
Solution (Application)
Server project Client project
Entities Entities
Build, reflect
Data & code-gen Views
Access Domain
Domain
Layer Service
Context
(DAL)

27. Communications
Run-time view (entity lifecycle)
Application
Web server Silverlight
Query Load
Data
Entities Domain Entities
Access Domain Views
Layer Service Context Submit
Submit
(DAL)
Results Results

28. Communications
Services
 Authentication
 Roles
 User profile
 All integrate w/ ASP.NET infrastructure

29. WCF RIA Services

30. Agenda
 Introduction
 Recommended Pattern
 Communications
 Beyond the Browser
 Extensibility
 Q&A

31. Beyond the Browser
 Out-of-Browser Applications
 Trusted Applications

32. Beyond the Browser
Out-of-Browser – Already on Silverlight 3
 Configuration Based
 AppManifest.xml
 Can be enabled in an existing application without rebuilding
 Install option on its right-click menu
 Can run without a network connection
 You can implement network detection and provide offline
support when a connection is unavailable

33. Beyond the Browser
Out-of-Browser
 Windowing API
 WebBrowser control
 HtmlBrush
 Notification (aka. Toast)

34. Beyond the Browser
Trusted Applications
 OOB with elevated privileges
 COM Interop in Windows
 File system access
 Cross-domain networking access
 Full keyboard support in Full-Screen Mode

35. Beyond the Browser

36. Agenda
 Introduction
 Recommended Pattern
 Communications
 Beyond the Browser
 Extensibility
 Q&A

37. Extensibility
 Prism v2
 MEF – Managed Extensibility Framework

38. Extensibility
Prism v2
 Prism is a set of options
 Use what you want and ignore the rest
◦ Example:
 Choose Modules and Commanding, but ignore Event Aggregation
and Regions

39. Extensibility
Prism v2
 Prism Technical Concepts

40. Extensibility
MEF – Managed Extensibility Framework
A new library in Silverlight 4 for building
applications that can be incrementally
extended.

41. Extensibility
MEF – Managed Extensibility Framework
An Application is built of parts.

42. Extensibility
MEF – Managed Extensibility Framework
Export it.
Import it.
Compose it.

44. Extensibility
MEF – Managed Extensibility Framework
 Export it - Metadata
[ExportMetadata(“Location”,Location.Top)]
[Export(typeof(UserControl))]
public class Widget1 : UserControl
{
public string Message {
get{return(string) Button.Content;}
set{Button.Content=value;}
}
}
Widget1 Export

45. Extensibility
MEF – Managed Extensibility Framework
 Import it - Metadata
[Export(typeof(UserControl))]
public class MainPage: UserControl
{
[ImportMany(typeof(UserControl))]
public IEnumerable<Lazy<UserControl, IWidgetMetadata>
{
get;set;
}
}
Main
ImportMany
Page

46. MEF – Managed Extensibility Framework

47. Agenda
 Introduction
 Recommended Pattern
 Communications
 Beyond the Browser
 Extensibility
 Q&A

49. Nuno Filipe Godinho
Independent Consultant
Mail: Nuno.Godinho@sapo.pt
Nuno.Godinho@itech4all.com