How can a WPF UserControl inherit a WPF UserControl?

Question

The following WPF UserControl called DataTypeWholeNumber which works.

Now I want to make a UserControl called DataTypeDateTime and

Answer 1

I ran into the same issue but needed to have the control inherit from an abstract class, which is not supported by the designer. What solved my problem is making the usercontrol inherit from both a standard class (that inherits UserControl) and an interface. This way the designer is working.

//the xaml

    ...


// the usercontrol code behind
public partial class UC_BatimentAgricole : EcranFiche, IEcranFiche
{
    ...
}

// the interface
public interface IEcranFiche
{
   ...
}

// base class containing common implemented methods
public class EcranFiche : UserControl
{
    ... (ex: common interface implementation)
}