This document discusses key concepts in Silverlight and MVVM including: MVVM pattern with model, view model, and view layers; data binding and change notification using INotifyPropertyChanged and dependency properties; XAML usage; calling web services; and demos of RIA services and two-way data binding between views and view models.

1. The Basics - II

2.  Silverlight and JS Demo
 MVVM
 Binding
 Change Notification
• INotifyPropertyChanged
• Dependency Properties
• ObservableCollection
 XAML
 Silverlight
and Web Services
 RIA Services
 Demos

5.  Model – Domain Object
• Actual Data
• Holds information, not behavior or services that
manipulate the information
 View Model – converter between View and
Model
 View – Presentation

6.  Separation between View and ViewModel
 Test driven development
 Better data binding - two way data-binding
possible
 ViewModel can aggregate parts of model
present in separate classes

7.  One Way
• GUI element is updated whenever the object to
which element is bound is updated
 Two Way
• GUI element is updated whenever the object to
which element is bound is updated. Also, object is
updated whenever GUI changes.
 One Time
• The object to which the UI element is bound can
change the value of GUI element only once.

8.  INotifyPropertyChanged

9.  Dependency Properties
Button 1
Shared Default Value
Button 2 Grid.Column = 0
Button 3
Instance Specific Value
Button 4 Grid.Column = 1

12.  Separating Design from Development
 Portability between Web and Windows
• Logical Tree – XAML as is
• Visual Tree – representation of actual code
 Every element of visual tree is a dependency property

13.  Demo

14.  Demo

15.  Simplifies development of N-tier RIA
 No need to focus on service plumbing
 Client is automatically updated with latest
logic every time the solution is re-compiled

16.  Demo