Event bus using Reactive Extensions
A tiny in-process event bus built on Reactive Extensions, and how exposing IObservable<T> lets you filter and compose events, using WPF notifications as the example.
Tag
wpf
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Sample data in the ViewModel to make the design view easier
How to load sample data into a WPF ViewModel only at design time, so the XAML designer shows real-looking lists while you adjust styles and layout.