c# UserControl base class inheritance

Question

I have a base class call PopupWindow which inherits from UserControl. PopupWindow has no associated xaml page, its just a regular class which inherits from UserControl

I then have another UserControl which inherits from PopupWindow. Now this is a proper user control in that is has an associated xaml page.

I have changed the root xaml tag to be PopupWindow like this

<local:PopupWindow
  .....
</local:PopupWindow>

where local is the namespace in this PopupWindow exists.

But I keep getting an error that PopupWindow does not exist in the given namespace.

What am I doing wrong?

Thanks

score 2 · Accepted Answer · answered May 30 '13 at 09:01

I've managed to get this working as follows:

Parent control:

public class PopupWindow : UserControl
{
}

Inheriting control:

Code behind:

public partial class PopupWindowChild
{
    public PopupWindowChild()
    {
        InitializeComponent();
    }
}

XAML:

<Controls:PopupWindow x:Class="MyNamespace.Controls.PopupWindowChild"
                      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                      xmlns:Controls="clr-namespace:MyNamespace.Controls">
    <TextBlock Text="Blah" />
</Controls:PopupWindow>

Main view:

<Window x:Class="MyNamespace.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:Controls="clr-namespace:MyNamespace.Controls">
    <Controls:PopupWindow />
</Window>

Your XAML won't recognise your control until the code is built. Once built and run, I'm seeing "Blah" in my main view as expected.

Thats great you got it working. What if PopupWindow uses generics, i.e public class PopupWindow : UserControl ? — There is no spoon, May 30 '13 at 09:21
Great stuff, glad I was able to help. Please make sure to mark the answer! Have a look at [this](http://jamescrisp.org/2008/05/26/wpf-control-inheritance-with-generics/) for more information on WPF controls with generics. — Rob, May 30 '13 at 09:23
The code behind for PopupWindowChild does not itself show any inheritance - I assume that the autogenerated code from the XAML would contain this instead? (in its partial class declaration)? — StayOnTarget, Sep 05 '18 at 12:21

c# UserControl base class inheritance

1 Answers1