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The scenario was like this: I had a Base class where a defined abstract members that where implemented in a form. When wanted to see the design of the page this warning appeared even though the application runs just fine. So how to get rid of this error: "The designer must create an instance of type 'SchedeMaterialiDaTaglio.BaseClass.TabBaseControl' but it cannot because the type is declared as abstract. " ?
Well, searching around I got to this post http://www.platinumbay.com/blogs/dotneticated/archive/2008/01/05/designing-windows-forms-with-abstract-inheritance.aspx where I found part of the solution.
Here it is:
public class AbstractCommunicatorProvider : TypeDescriptionProvider
{
public AbstractCommunicatorProvider()
: base(TypeDescriptor.GetProvider(typeof(UserControl)))
{
}
public override Type GetReflectionType(Type objectType, object instance)
{
return typeof(UserControl);
}
public override object CreateInstance(IServiceProvider provider, Type objectType, Type[] argTypes, object[] args)
{
objectType = typeof(UserControl);
return base.CreateInstance(provider, objectType, argTypes, args);
}
}
You define this class in inherited class(it only worked for me in this way) and you must also put this for base class and inherited class: [TypeDescriptionProvider(typeof(AbstractCommunicatorProvider))]
public partial class TabUC : TabBaseControl{}
[TypeDescriptionProvider(typeof(AbstractCommunicatorProvider))]
public abstract class TabBaseControl : UserControl, ITabBase{}
Of course that you will have to include System.ComponentModel namespace and others just as needed.Hope it helped. Ciao.
