Question

<Window.Resource>
    <ResourceDictionary>
        <local:SomeResourceWithObsCollection x:Key="MyItemWithCollection">
            <local:SomeClass.Instance /> <!-- THIS DOES NOT WORK -->
        </local:SomeResourceWithObsCollection>
    </ResourceDictionary>
</Window.Resources>

I don’t know how to get that line to work… I’ve tried doing <x:Static SomeClass.Instance />, but that also isn’t allowed.

[ContentProperty("TheItems")]
public class SomeResourceWithObsCollection
{
    public class SomeResourceWithObsCollection()
    {
        TheItems = new ObservableCollection<IMyInterface>();
    }

    public ObservableCollection<IMyInterface> TheItems { get; set; }
}

public class SomeClass : IMyInterface
{
    private static SomeClass _instance = new SomeClass();

    private SomeClass() { }

    public SomeClass Instance { get { return _instance; } }
}

Answer 1

You can’t do what you’re asking to do in XAML as of right now. Perhaps future versions of XAML will account for this. You have to do it in the code behind, here is an example:

Adding a static object to a resource dictionary