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POAvalonDock DocumentContent not garbage collected
 

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    <p>I have created an application that makes use of the AvalonDock framework. A key part is the ability to edit domain-model entities using <code>AvalonDock.DocumentContent</code> derived editors. I hit upon a problem and discovered the my editors are not being garbage collected after they are closed and removed from the <code>DockingManager.Documents</code> collection.</p> <p>After some fruitless searching I created a small test application that can be recreated in the following manner:</p> <ul> <li>In Visual Studio (I'm using 2008), create a new WPF application called <code>AvalonDockLeak</code>;</li> <li>Add a reference to the AvalonDock library (my version is 1.3.3571.0);</li> <li>Add a new UserControl called <code>Document</code>;</li> <li><p>Change Document.xmal to:</p> <pre><code>&lt;ad:DocumentContent x:Class="AvalonDockLeak.Document" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:ad="clr-namespace:AvalonDock;assembly=AvalonDock"&gt; &lt;Grid&gt; &lt;TextBox /&gt; &lt;/Grid&gt; &lt;/ad:DocumentContent&gt; </code></pre></li> <li><p>Change Document.xmal.cs to:</p> <pre><code>namespace AvalonDockLeak { using AvalonDock; public partial class Document : DocumentContent { public Document() { InitializeComponent(); } ~Document() { } } } </code></pre> <p>The destructor I have added to be able to diagnose the problem adding a breakpoint on the methods opening {, and seeing if it gets hit. It always does on closing the test application but not earlier.</p></li> <li><p>Now change Window1.xaml to:</p> <pre><code>&lt;Window x:Class="AvalonDockLeak.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:ad="clr-namespace:AvalonDock;assembly=AvalonDock" Title="Memory Leak Test" Height="300" Width="300"&gt; &lt;Grid&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="Auto" /&gt; &lt;RowDefinition /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Button Name="NewButton" Click="NewButton_Click" Content="New" Height="26" Width="72" /&gt; &lt;ad:DockingManager x:Name="DockManager" Grid.Row="1"&gt; &lt;ad:DocumentPane /&gt; &lt;/ad:DockingManager&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre></li> <li><p>Change Window1.xaml.cs to:</p> <pre><code>namespace AvalonDockLeak { using System.Windows; public partial class Window1 : Window { private int counter = 0; public Window1() { InitializeComponent(); } private void NewButton_Click(object sender, RoutedEventArgs e) { string name = "Document" + (++this.counter).ToString(); var document = new Document() { Name = name, Title = name, IsFloatingAllowed = false }; document.Show(this.DockManager); document.Activate(); } } } </code></pre></li> </ul> <p>This simple application also contains the leak. Which can be observed by the breakpoint on the <code>~Document()</code> opening { not getting hit after closing a <code>DocumentContent</code>.</p> <p>Now what I want to now is, is this a known problem and is there a way to prevent it? If the objects are only garbage collected after a long time then what can I do to expedite this? Calling GC.Collect() does not help by the way.</p>
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    1. COCheck the Avalon source code and see what `document.Show(this.DockManager);` does. I guess the document registers itself in some way with the manager and it's not being unregistered properly. Is there a method on the DockManager to remove documents?
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    2. COIt simply does `manager.Documents.Add(this);`. After the document is closed it is also no longer present in the `manager.Documents` collection.
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    3. COWell, one way to find out is to attach a memory profiler or make a memory dump and use debugging tools for windows to find out what's holding the references.
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