public partial class UserApp : MyProject.Core.Application
{
}
public partial class MyProject.Core.Application : ControlBase
{
}
public abstract class ControlBase : UserControl, IDisposable
{
}
class ControlBase and Application are in project that have name: Core
class UserApp is in project that have name: User
All project is contained in a solution name: MyProject
User.xaml
<Grid xmlns="http://schemas.microsoft.com/client/2007"
xmlns:app="clr-namespace:MyProject.Applications.User;assembly=User">
<app:UserApp > </app:UserApp>
</G ...
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