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POBinding to a single element inside a CompositeCollection
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  1. POBinding to a single element inside a CompositeCollection
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    copied!<p>I am trying to produce a list of servers for browsing on a network such that it produces a tree view which looks like this:</p> <pre><code>-Local Server - Endpoint 1 - Endpoint 2 -Remote - &lt;Double-click to add a server...&gt; - Remote Server 1 - Endpoint 1 - Endpoint 2 - Remote Server 2 - Endpoint 1 - Endpoint 2 </code></pre> <p>My ViewModel looks like this:</p> <pre><code>... public Server LocalServer; public ObservableCollection&lt;Server&gt; RemoteServers; ... </code></pre> <p>So, how does one go about constructing the list in xaml with a binding to a single object <strong>and</strong> a list of objects? I might be thinking about it completely the wrong way, but what my brain really wants to be able to do is something like this:</p> <pre><code>&lt;CompositeCollection&gt; &lt;SingleElement Content="{Binding LocalServer}"&gt; &lt;!-- ^^ something along the lines of a ContentPresenter --&gt; &lt;TreeViewItem Header="Remote"&gt; &lt;TreeViewItem.ItemsSource&gt; &lt;CompositeCollection&gt; &lt;TreeViewItem Header="&amp;lt;Click to add...&amp;gt;" /&gt; &lt;CollectionContainer Collection="{Binding RemoteServers}" /&gt; &lt;/CompositeCollection&gt; &lt;/TreeViewItem.ItemsSource&gt; &lt;/TreeViewItem&gt; &lt;/CompositeCollection&gt; </code></pre> <p>I feel like there must be a fundamental element I'm missing which keeps me from being able to specify what I want here. That single item has children. I did try using a ContentPresenter, but for whatever reason, it was not expandable even though it picked up the <code>HierarchicalDataTemplate</code> to display the title correctly.</p> <hr> <p><strong>Update</strong></p> <p>So for now, I've exposed a property on the view model that wraps the single element in a collection so that a <code>CollectionContainer</code> may bind to it. I would really like to hear folks' ideas on how to do this, though. It seems awfully fundamental.</p>
 

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