c# - inheritance WPF layout - Window from Window

Question

I have problem with my inheritance of \'Window\', I don\'t understand what the problem is?

I think, my layout (MediaLibrary.xaml) have to inherit of MainWindow... But I

Answer 1

You can not subclass a visual .XAML class such as you are attempting. Only classes that are built in your C# code can be inherited.

Now, that said, you can create your own visual theme of a window with respect to style, colors, etc (or do in code), then build your classes upon that class from code.

public class MyWindow : Window
{
   public class MyWindow()
   {
      SomeProperty = SomeValue;
   }

   protected void SomeCustomFunction(int AnyParameter)
   {
      SomethingCommon = AnyParameter;
   }

   etc...
}

Build your project so this class is then known/available for derivation purposes.

Now, when you create your .XAML-based Window, let it create the default based on "Window". Then, modify both your .XAML.cs and your .cs versions and change the reference to YOUR "MyWindow" class something like...

From

<Window x:Class="blah...

to

<myLib:MyWindow x:Class="blah
   xmlns:myLib="clr-namespace:MyWpfClassLibrary"

in the XAML, you will also need to add reference to your class library namespace, something like... the xmlns if your window class is in another project/namespace. The "myLib" is like an "alias" to that class library so it can be used within the rest of the XAML, it knows how/where to resolve the class references.

In the .cs code, change

public partial class blah : Window

to

public partial class blah : MyWindow

If your class library is in the same namespace, you should be good to go. If not, you can either add a

using MyLibrary;   before the public partial class -- OR

public partial class blah : MyLibrary.MyWindow