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PORefreshing Read-Only (Chained) Property in MVVM
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  1. PORefreshing Read-Only (Chained) Property in MVVM
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    copied!<p>I'm thinking this should be easy, but I can't seem to figure this out.</p> <p>Take these properties from an example ViewModel (ObservableViewModel implements INotifyPropertyChanged):</p> <pre><code>class NameViewModel : ObservableViewModel { Boolean mShowFullName = false; string mFirstName = "Wonko"; string mLastName = "DeSane"; private readonly DelegateCommand mToggleName; public NameViewModel() { mToggleName = new DelegateCommand(() =&gt; ShowFullName = !mShowFullName); } public ICommand ToggleNameCommand { get { return mToggleName; } } public Boolean ShowFullName { get { return mShowFullName; } set { SetPropertyValue("ShowFullName", ref mShowFullName, value); } } public string Name { get { return (mShowFullName ? this.FullName : this.Initials); } } public string FullName { get { return mFirstName + " " + mLastName; } } public string Initials { get { return mFirstName.Substring(0, 1) + "." + mLastName.Substring(0, 1) + "."; } } } </code></pre> <p>The guts of such a [insert your adjective here] View using this ViewModel might look like:</p> <pre><code>&lt;TextBlock x:Name="txtName" Grid.Row="0" Text="{Binding Name}" /&gt; &lt;Button x:Name="btnToggleName" Command="{Binding ToggleNameCommand}" Content="Toggle Name" Grid.Row="1" /&gt; </code></pre> <p>The problem I am seeing is when the ToggleNameCommand is fired. The ShowFullName property is properly updated by the command, but the Name binding is never updated in the View. </p> <p>What am I missing? How can I force the binding to update? Do I need to implement the Name properties as DependencyProperties (and therefore derive from DependencyObject)? Seems a little heavyweight to me, and I'm hoping for a simpler solution.</p> <p>Thanks, wTs</p>
 

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