将整个UserControl绑定到属性

Question

My viewModel gets a UserControl from a service. I want to display that UserControl.

XAML looks like:

<Grid >
    <ContentPresenter Content="{Binding AddInUI}">

    </ContentPresenter>
</Grid>

And the ViewModel's property like:

public UIElement MyUI
        {
            get
            {
                return myUI;
            }
            set
            {
                Set(ref myUI, value);
            }
        }

So I fetch the ui and set to this VM's property. However, nothing renders in the UI. The getter of the MyUI property never gets called, even after I assign value to it, like:

MyUI = 'some user control';

Answer 1

A VM would not contain a UI-specific element like this. It would however retrieve a ViewModel context for MyUI property and use a DataTemplate in the XAML to render that ViewModel Type appropriately.

Answer 2

实现INotifyPropertyChanged并在MyUI属性set通知MyUI属性。