Question

I have problem with control inheritance in WPF. I created a UserControl named BaseUserControl. I want for this control to be a base control for other WPF userControls. So I wrote another UserControl called FirstComponent. In next step I changed this code

FirstComponent : UserControl

to this

FirstComponent : BaseControl

However during compilation I get this error

Partial declarations of 'controlinheritance.componenets.FirstComponent' must not specify different base classes 

What should I do to enable FirstComponent to derive from BaseControl?

EDIT
Thanks to abhishek answer I managed to inherit controls . Howerver I have another question. In base class I specified a property public Grid _MainGrid { get; set; }. Now I want in my derived class create an instance of this grid. So I used this code

Howerver I get an error Property ‘_MainGrid’ does not have a value. Line 8 Position 36.

Answer 1

Did you see my complete article on it?

http://www.dotnetfunda.com/articles/article832-define-base-class-for-window–usercontrol-.aspx

I hope that would help you in this.

If you try to execute the project, it would definitely throw error to
you. This is because, every WPF window is created from the baseWindow
layout rather than the current Window layout. In other words, if you
see the XAML, you will see the root tag is Window, which is a class
just parent of the current window.

Thus to ensure everything works perfectly, we need to change the Root
Element.

So it would look like :

<local:BaseWindow Class="BaseWindowSample.Window1" 
                  Name="winImp" 
                  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
                  x="http://schemas.microsoft.com/winfx/2006/xaml" 
                  xmlns:local="clr-namespace:BaseWindowSample" 
                  Title="Window1">
...
</local:BaseWindow>

If you see this minutely, you can see I have added one namespace to my
project and named it as local. So BaseWindow should come from
BaseWindow and thus it goes like local:BaseWindow