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Introduction to WPF and MVVM
- 1. INTRODUCTION TO WPF AND MVVM SIRAR SALIH .NET CONSULTANT
- 3. Windows Presentation Foundation • Graphical subsystem introduced by Microsoft to render user interfaces, and allow development of rich, interactive client applications • Was initially known as «Avalon» and first released in .NET 3.0 • Uses DirectX • 2D/3D rendering, vector graphics, animation etc. • Attempts to seperate UI from logic – XAML • Deployment – Standalone desktop client – Can also be embedded in web 19.01.2014 / 3
- 4. Windows Presentation Foundation • Microsoft PixelSense (Surface 2.0) 19.01.2014 / 4
- 5. Windows Presentation Foundation • Silverlight – Most functionality is a subset of WPF • Latest release: WPF 4.5 19.01.2014 / 5
- 6. Model-View-ViewModel • Architectural pattern based on Model-View-Controller (MVC) • Seperation of Concerns – Data/Domain objects (Model), GUI (View), logic (ViewModel) • Eliminates «code-behind» • The beauty of it: Designers can work indepedently on the views and UX, while developers work on the back-end • Allows [easier]: – Maintainability – Testability – Blendability 19.01.2014 / 6
- 8. WPF + MVVM How about we combine them? That’s awesome! 19.01.2014 / 8
- 9. Combining WPF and MVVM View Commands DataBinding ViewModel Model 19.01.2014 / 9
- 10. DataBinding • Establishes connection between Views and ViewModels • Enables the View to bind to properties in the ViewModel • DataContext • Two-way binding • Dependency properties 19.01.2014 / 10
- 11. Commands • Enable the View to call methods in the ViewModel • Exposed as properties from the ViewModel • Implement ICommand 19.01.2014 / 11
- 12. MVVM frameworks for WPF Cocktail Carbon MVVM Caliburn Xomega MVVM Cross MVVM foundation Onyx MVVM Light Toolkit Cinch Jounce Core MVVM Ocean Prism Reactive UI Goldlight Catel 19.01.2014 / 12
- 13. MVVM Light Toolkit • • • • • • • By Laurent Bugnion Small and simple Breaking the monotony Essentials library Extras library Project templates Code snippets 19.01.2014 / 13
- 14. ViewModelBase • Utility class that ViewModel inherits from • Eliminates code duplication • Introduces the RaisePropertyChanged method, among others 19.01.2014 / 14
- 15. EventToCommand • Enables the passing of arguments to the ViewModel through the Command • Interaction triggers are used on top, for events (that fire the command) 19.01.2014 / 15
- 16. RelayCommand • An alternative to Command and RoutedCommand in WPF • Also implements ICommand • Relays Execute to own defined method, therefore eliminates the need to create a class for each custom Command 19.01.2014 / 16
- 17. Messaging • Easier communication between ViewModels • Uses Publish-Subscribe pattern • A receiver ViewModel registeres on a specific type message • A sender ViewModel creates a message of that specific type and sends it, receiver gets it 19.01.2014 / 17
- 19. Messaging • Message: • Sender: • Receiver: 19.01.2014 / 19
- 20. DispatcherHelper • Useful when working on multi-threaded WPF applications • Enables the calling of a method on the UI thread from a different thread • Use this or DispatcherTimer when creating a thread, never use a Timer 19.01.2014 / 20
- 22. Future of WPF • Windows RT – No support • Windows 8 Desktop – Works • XAML usage in Windows 8 Store apps 19.01.2014 / 22