Empfohlen
Weitere ähnliche Inhalte
Was ist angesagt?
Was ist angesagt? (20)
Andere mochten auch
Ähnlich wie MVVM Light Toolkit Works Great, Less Complicated
Ähnlich wie MVVM Light Toolkit Works Great, Less Complicated (20)
Kürzlich hochgeladen
Kürzlich hochgeladen (20)
MVVM Light Toolkit Works Great, Less Complicated
- 1. MVVM Light Toolkit Works Great, Less Complicated Tom Fischer September 29, 2011
- 2. Agenda ∗ Background ∗ Enterprise Applications ∗ XAML ∗ Ramifications ∗ Architecture Considerations ∗ Patterns ∗ Toolkits ∗ Toolkit Demonstration ∗ Sample Application ∗ Incorporating MVVM Light
- 3. Background: Enterprise Application Definition ∗ Targets ∗ Any type of organization ∗ Any type of industry ∗ Not intended for consumers ∗ Function focused, such as, accounting, purchasing, sales, etc.
- 6. Background: XAML Definition ∗ Declarative markup language for .NET API with XML nodes equating to CLR objects ∗ Features include ∗ Rich eventing support ∗ Declarative databinding ∗ Developer friendly conventions, such as, the content property equals the “inner xml” of many nodes
- 7. Background: XAML & CLR Objects
- 8. Background: Ramifications ∗ Enterprise applications do not ruthlessly follow well trodden UI guidelines; business users know what they want ∗ XAML does not mirror ASP.NET or Windows Form technologies, blindly adhering to their patterns & practices may result in harder to build and maintain Silverlight/WPF applications
- 9. Architecture Considerations: Options ∗ Patterns ∗ Toolkits ∗ Code Behind ∗ Caliburn Micro ∗ MVC ∗ Catel ∗ MVP ∗ MVVM Foundation ∗ MVVM ∗ MVVM Light Silverlight ∗ Simple MVVM ∗ Prism Note: The above lists are NOT exhaustive. Many other relevant patterns and toolkits exist.
- 10. Architecture Considerations: The UI Pattern’s Pattern
- 11. Architecture Considerations: UI Pattern Picking ∗ Theoretical considerations ∗ Not the same as most software patterns (maybe why some call them “frameworks”?) ∗ Technology dominates ∗ Practical considerations ∗ Application complexity and life span ∗ Development team’s abilities and interests ∗ Organizational resources and support
- 12. Architecture Considerations: UI Patterns and Technology ∗ MVC (Model-View-Controller) ∗ Conceived when viewers offered very little support for a software developer writing presentation code ∗ Built with language and platform specific helpers ∗ MVP (Model-View-Presenter) ∗ 2nd generation MVC; facilitated testing ∗ Response to feature rich viewers ∗ MVVM (Model-View-ViewModel) ∗ 3rd generation MVC; reduced coder/designer friction ∗ Response to XAML
- 13. Architecture Considerations: Toolkit Overview ∗ Plugs gap between technology and its use; maybe entitled “helper” code!? ∗ Considerations ∗ Fit (Simple as possible, but not simpler) ∗ How well does it plug the gap? ∗ Does it include more than required? ∗ Obsolescence susceptibility ∗ Handle newer, better technologies ∗ Ingest requirement/application changes
- 14. Architecture Considerations: Prism Toolkit ∗ Overview ∗ Supports WPF and Silverlight ∗ Available on Microsoft Download Center ∗ V4 (11/2010) ∗ Supports MVVM many features, such as, ∗ Bootstrapper ∗ Dependency Injection (Unity & MEF) ∗ Composition (über) ∗ Event Aggregator ∗ Wiring Commands & Events
- 15. Side Note: Prism It’s Complicated, Documented & Supported
- 16. Architecture Considerations: Caliburn Micro Toolkit ∗ Overview ∗ Supports WPF, Silverlight and Windows 7 ∗ Paired down version of Caliburn (10X smaller) ∗ Available on CodePlex ∗ V1.2 RTW (7/2011) ∗ 2,000+ downloads ∗ Supports MVVM and MVP with ∗ Bootstrapper ∗ Composition ∗ Event Aggregator ∗ Window Manager ∗ Wiring Commands & Events
- 17. Architecture Considerations: MVVM Light Toolkit ∗ Overview ∗ Supports WPF, Silverlight and Windows 7 ∗ Available on CodePlex ∗ V3 SP1 (2/2011) ∗ 20,000+ downloads ∗ Supports MVVM with ∗ Event Aggregator ∗ Service Locator ∗ Wiring Commands & Events
- 18. Side Note: What about CSLA.NET, Enterprise Library & Entity Framework? ∗ CSLA.NET ∗ Solves data access & business logic problems ∗ Works with most .NET UI technologies, especially those leveraging databinding ∗ Not focused on specific UI pattern or technology ∗ Enterprise Library ∗ Addresses aspect oriented & generic problems ∗ Not associated with any UI pattern or technology ∗ Entity Framework ∗ Handles database exchanges ∗ Not associated with any UI pattern or technology
- 19. Architecture Considerations: Conclusion ∗ MVVM pattern facilitates XAML-based enterprise applications ∗ Supports commands & databinding ∗ Minimizes designer-developer friction ∗ Many toolkits exist supporting MVVM-XAML ∗ Offer expected “helpers” ∗ Require varying degrees of “buy-in”
- 20. Toolkit Demonstration: Overview ∗ Work thru a simple client information application with Silverlight (out of browser) ∗ Implement three iterations (as projects) ∗ 1st Iteration constructed as a basic non-MVVM ∗ 2nd Iteration converted to an MVVM to help handle additional requirements ∗ 3rd Iteration incorporate MVVM Light to fix a few architecture issues uncovered in 2nd Iteration
- 21. Toolkit Demonstration: Solution 1st Iteration 2ND Iteration 3rd Iteration
- 22. Toolkit Demonstration: Why MVVM Light Toolkit? ∗ Solves known issues ∗ Communications between controls ∗ Turning UI events into commands ∗ Avoids unnecessary features (for now), e.g., ∗ Composition ∗ Navigation ∗ Reasonably documented and stable
- 23. Toolkit Demonstration: Sample Application 1st Iteration ∗ MainPage.xaml.cs communicates with two models (ClientInformation and ClientPreferences) ∗ Databinding not employed; properties programmatically manipulated
- 24. Toolkit Demonstration: Sample Application Models 2nd & 3rd Iteration
- 25. Toolkit Demonstration: Sample Application 2nd Iteration ∗ MainPage.xaml.cs indirectly communicates with three models (ClientInformation, ClientPreferences and ClientSale) via two ViewModel classes ∗ Databinding employed; UI events initiate data access
- 26. Toolkit Demonstration: Sample Application 3rd Iteration ∗ 2nd iteration + MVVM Light Toolkit ∗ Databinding and commands leveraged to allow all logic to live within the ViewModels
- 27. Toolkit Demonstration: Recap ∗ 1st Iteration – architecture typical of many Windows Form-based applications ∗ 2nd Iteration – MVVM pattern applied with a few resulting “programming holes” ∗ Communications limited between controls ∗ Events to commands not fully supported ∗ 3rd Iteration – MVVM Light Toolkit addresses shortcomings from the 2nd Iteration
- 28. Toolkit Demonstration: Some Other MVVM Light Features… ∗ Ability to dynamically load appropriate ViewModel classes (ServiceLocation) ∗ Designed to work well with Blend ∗ Developer Candy ∗ NuGet support ∗ Visual Studio templates ∗ C# snippets
- 29. ∗Thanks for attending! ∗Any other questions?