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POCreating a CustomUserControl with a DependencyProperty of type ObservableCollection
 

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    <p>I am trying to create a CustomUserControl in WPF. This CustomUserControl contains a DependencyProperty of type ObservableCollection.</p> <p>My goal is to be able to:</p> <ul> <li>Be able to set the collection directly in the xaml code</li> <li>Be able to bind the collection to a collection in my ViewModel</li> <li>Be able to set the collection using a style setter</li> <li>Have a different instance of the collection per instance of my CustomUserControl.</li> </ul> <p>Here is what I have right now:</p> <pre><code>&lt;my:CustomUserControl ImageList={Binding imgList}/&gt; </code></pre> <p>ImageList is defined as the following:</p> <pre><code>public static readonly DependancyProperty ImageListProperty = DependancyProperty.Register ("ImageList", typeof(List&lt;ImageSource&gt;), typeof(Switch)); public List&lt;ImageSource&gt; ImageList { get { return (List&lt;ImageSource&gt;)GetValue(ImageListProperty); } set { SetValue(ImageListProperty, value); } } </code></pre> <p>In order to have a new instance of ImageList per CustomUserControl, I have added the following line in the ctor of CustomUserControl:</p> <pre><code>public CustomUserControl(){ ... SetValue(ImageListProperty, new List&lt;ImageSource&gt;()); } </code></pre> <p>Now, the following code examples work:</p> <pre><code>&lt;my:CustomUserControl&gt; &lt;my:CustomUserControl.ImageList&gt; &lt;BitmapImage UriSource="Bla.png"/&gt; &lt;BitmapImage UriSource="Bla2.png"/&gt; &lt;/my:CustomUserControl.ImageList&gt; &lt;/my:switch&gt; </code></pre> <p>And this works too:</p> <pre><code>&lt;my:CustomUserControl ImageList={Binding imgList}/&gt; </code></pre> <p>But this <strong>does not</strong>:</p> <pre><code>&lt;Style TargetType="my:CustomUserControl"&gt; &lt;Setter Property="my:CustomUserControl.ImageList"&gt; &lt;BitmapImage UriSource="Bla.png"/&gt; &lt;BitmapImage UriSource="Bla2.png"/&gt; &lt;/Setter&gt; &lt;/Style&gt; </code></pre> <p>This leaves all instances with an empty ImageList.</p> <p>P.S. This is pseudo-code as I don't recall the exact syntax.</p> <p>Thanks!</p>
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