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POWPF DataGridTemplateColumn with ComboBox Binding (MVVM pattern)
 

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    <p>I'm going bonkers with the following WPF DataGrid+ComboBox scenario.</p> <p>I have a set of classes which look like;</p> <pre><code>class Owner { int ID { get; } string Name { get; } public override ToString() { return this.Name; } } class House { int ID { get; } Owner HouseOwner { get; set; } } class ViewModel { ObservableCollection&lt;Owner&gt; Owners; ObservableCollection&lt;House&gt; Houses } </code></pre> <p>Now my desired outcome is a DataGrid which shows a list of rows of type <strong>House</strong>, and in one of the columns, is a ComboBox which allows the user to change the value of <strong>House.HouseOwner</strong>. </p> <p>In this scenario, the DataContext for the grid is <strong>ViewModel.Houses</strong> and for the ComboBox, I want the ItemsSource to be bound to ViewModel.Owners.</p> <p>Is this even possible? I'm going mental with this... the best I've been able to do is to correctly get the ItemsSource bound, however the ComboBox (inside a DataGridTemplateColumn) is not showing the correct values for House.HouseOwner in each row.</p> <p>NOTE: If I take the ComboBox out of the picture and put a TextBlock in the DataTemplate instead, I can correctly see the values for each row, but getting both an ItemsSource as well as show the correct value in the selection is not working for me...</p> <p>Inside my code behind, I have set the DataContext on the Window to <strong>ViewModel</strong> and on the grid, the DataContext is set to <strong>ViewModel.Houses</strong>. For everything except this combobox, it's working...</p> <p>My XAML for the offending column looks like;</p> <pre><code>&lt;DataGridTemplateColumn Header="HouseOwner"&gt; &lt;DataGridTemplateColumn.CellTemplate&gt; &lt;DataTemplate&gt; &lt;ComboBox ItemsSource="{Binding Path=DataContext.Owners, RelativeSource={RelativeSource AncestorType={x:Type Window}}}" DisplayMemberPath="Name" SelectedItem="{Binding HouseOwner, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}" SelectedValue="{Binding HouseOwner.ID, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}, Mode=OneWay}" SelectedValuePath="ID" /&gt; &lt;/DataTemplate&gt; &lt;/DataGridTemplateColumn.CellTemplate&gt; &lt;/DataGridTemplateColumn&gt; </code></pre> <p>Would love some help on this one... seems like a bit of Voodoo is required though...</p>
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