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    copied!<p>You could also do this using <a href="http://github.com/xpaulbettsx/ReactiveXaml" rel="nofollow noreferrer">ReactiveXaml</a>, though since your CurrentWidget and Widgets are both mutable, you can't make it as clean (there's a class called <a href="http://blog.paulbetts.org/index.php/2010/07/05/reactivexaml-series-implementing-search-with-observableaspropertyhelper/" rel="nofollow noreferrer">ObservableAsPropertyHelper</a> which will update a property based on an IObservable and fire the RaisePropertyChanged):</p> <pre><code>public class ViewModel { public ViewModel() { // These return a Func that wraps an async call in an IObservable&lt;T&gt; // that always yields only one item (the result of the call) var QueryAsObservable = Observable.FromAsyncCommand&lt;IEnumerable&lt;Widget&gt;&gt;(WebService.BeginQuery, WebService.EndQuery); var LoadAsObservable = Observable.FromAsyncCommand&lt;Widget&gt;(WebService.BeginLoad, WebService.EndLoad); // Create a new command QueryAndLoad = new ReactiveAsyncCommand(); // QueryAndLoad fires every time someone calls ICommand.Execute // The .Do is the hacky part, for sync calls it's hidden by RegisterAsyncFunction var async_results = QueryAndLoad.SelectMany(_ =&gt; QueryAsObservable()) .Do(_ =&gt; DoTranslate.AsyncCompletedNotification.OnNext(new Unit())); // Query up the Widgets async_results.Subscribe(x =&gt; x.Run(Widgets.Add)); // Now execute the Load async_results.SelectMany(_ =&gt; LoadAsObservable()) .Subscribe(x =&gt; CurrentWidget = x); QueryAndLoad.Execute(); } public ReactiveAsyncCommand QueryAndLoad {get; private set; } public ObservableCollection&lt;Widget&gt; Widgets {get; private set; } public Widget CurrentWidget {get; set; } } </code></pre>
 

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