为什么UserControl无法继承UserControl以外的其他内容

Question

I need all my user controls to have some similar functionality. So my user control it is as:

using System.Windows.Controls;


namespace WpfApplication26
{
    /// <summary>
    /// Interaction logic for UserControl1.xaml
    /// </summary>
    public partial class UserControl1 : UserControl
    {
        public UserControl1()
        {
            InitializeComponent();
        }
    }
}

ok now I want to make that control inherit from a base class where I have all my functionality as a result I now have something like:

I posted a picture to show you guys the error that I am getting. UserControl1 should be able to inherit from DraggableControl Since DraggableControl inherits from UserControl. I don't understand why visual studio does not let me compile that code.

Answer 1

It's probably because you didn't change the XAML declaration accordingly.

Answers to this question may help.

However, it looks like you can't derive from a class that has XAML :-(