By Gary Hall
WPF and Silverlight are not like the other consumer interface (UI) applied sciences. they've been outfitted to a brand new paradigm that—if harnessed correctly—can yield remarkable energy and function. This booklet exhibits you the way to manage that strength to supply fresh, testable, maintainable code. it really is now famous that any non-trivial WPF or Silverlight software wishes be designed round the Model-View-ViewModel (MVVM) layout development with a view to unencumber the technologys complete data-binding power. notwithstanding, the information of the way to do that is lacking from a wide a part of the advance community—even among those that paintings with WPF and Silverlight every day. Too usually there's a reliance on programmatic interplay among controls and never sufficient belief within the applied sciences data-binding services. This ends up in a clouding of layout values and an inevitable lack of functionality, scalability, and maintainability through the program.
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Additional info for Pro WPF and Silverlight MVVM Effective Application Development with Model-View-ViewModel
It is useful for specifying default display values for null inputs.
The ObjectDataProvider has a permissions requirement: the underlying domain object that is being wrapped must be accessible via reflection. If 42 CHAPTER 2 ■ DATABINDING this is not the case, the ObjectDataProvider will not be able to find the constructors, methods, or properties you specify in your XAML markup. Object Construction Let’s refactor our DomainObject from the multivalue data converter example (see Listing 2–18). Instead of hardcoding default values, we will accept values on construction.
We will see in the next section how the ObjectDataProvider lets us specify constructor parameters in XAML. Listing 2–16. Foreground> As Listing 2–16 shows, the difference in this example from the single-valued converter example is that the TextBlock’s Foreground uses a MultiBinding, whereby more than one binding is bound to the SolidColorBrush’s Color property. As you can imagine, unless the target requires more than one value, you must provide a converter so that only one binding value is output.