Question

Why is that when I define a view with data context in this way:

<views:MessageView DataContext="{x:Type presenters:MessagePresenter}"/>

that my MessagePresenter does not run its constructor?

What is the syntax to define view/presenter pairs like this in XAML?

Answer 1

{x:Type} returns the type of MessagePresenter, not an instance of MessagePresenter.

The following creates an instance of MessagePresenter:

<views:MessageView>
    <views:MessageView.DataContext>
        <presenters:MessagePresenter/>
    </views:MessageView.DataContext>
</views:MessageView>