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POReactive Extensions for .NET (Rx) in WPF - MVVM
 

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  1. POReactive Extensions for .NET (Rx) in WPF - MVVM
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    <p>I am using Reactive extensions for NET (Rx) with Caliburn.Micro in my WPF app. I'm trying to port my WPF app to use an MVVM architecture and I need to monitor changes in the Text property of a TextBox control.</p> <p>If the last change of the Text property was more than 3 seconds ago I need to call the LoadUser method of a service.</p> <p>Porting the logic from my old solution to the new solution with MVVM architecture.</p> <h2>OLD</h2> <p><strong>XAML:</strong></p> <pre><code>&lt;TextBox Name="Nick" Grid.Row="0" FontSize="14" Margin="2,2,2,2" HorizontalAlignment="Stretch" TextChanged="Nick_TextChanged" /&gt; </code></pre> <p>In <strong>code behind</strong> I have this:</p> <pre><code>... Observable.FromEvent&lt;TextChangedEventArgs&gt;(Nick, "TextChanged") .Select(e =&gt; ((TextBox)e.Sender).Text) .Where(text =&gt; text.Length &gt; 3) .Do(LoadUser) .Throttle(TimeSpan.FromSeconds(3000)) .Subscribe(LoadUser); ... private void LoadUser(string text){...} </code></pre> <p>I would like use Observable.FromEvent in my view model class. Something like this</p> <h2>WPF with MVVM</h2> <p><strong>View:</strong></p> <pre><code>&lt;TextBox Name="Nick" Grid.Row="0" FontSize="14" Margin="2,2,2,2" HorizontalAlignment="Stretch" Micro:Message.Attach="[TextChanged]=[Action TextChanged()]"/&gt; </code></pre> <p><strong>View Model:</strong></p> <pre><code>[Export(typeof(IAddFriendViewModel))] public class AddFriendViewModel : Screen, IAddFriendViewModel { private string _nick; public string Nick { get { return _nick; } set { _nick = value; NotifyOfPropertyChange(()=&gt;Nick); } } ... //how can I access to textbox control Nick in view from view model class? Observable.FromEvent&lt;TextChangedEventArgs&gt;(Nick, "TextChanged") .Select(e =&gt; ((TextBox)e.Sender).Text) .Where(text =&gt; text.Length &gt; 3) .Do(LoadUser) .Throttle(TimeSpan.FromSeconds(3000)) .Subscribe(LoadUser); ... private void LoadUser(string text) { } public void TextChanged() { } } </code></pre> <p>My problem is Observable.FromEvent uses the TextBox control and I don’t know how can I access this control from my ViewModel class.</p> <p>I can bind to the Text property of TextBox or I can bind a command to some event of the TextBox control, but this method uses an object in the View.</p> <p>Thank for ideas.</p>
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    1. USBryan Anderson
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