Our solution is to add an interface to the block:

public class SliderBlock : INotAvailableContent {}

The interface and descriptor:

public interface INotAvailableContent { }

[UIDescriptorRegistration]
public class NotAvailableContentDescriptor : UIDescriptor<INotAvailableContent> { }

The ContentArea defintion:

[AllowedTypes(RestrictedTypes = new[] { typeof(INotAvailableContent) })]
public virtual ContentArea MainContentArea { get; set; }

Now you can easy add INotAvailableContent for ContentAreas and blocks to avoid them.

Thanks Empa.

I am presuming I would still need to tag all my content area fields with the attribute

[AllowedTypes(RestrictedTypes = new[] { typeof(INotAvailableContent) })]

It is certainly less work than excluding each block individualy but would have been nice to have something which we could add onto the SliderBlockItem class to just exlude it from all content area apart from the one we exclusively specify.

Kind regards

Sandeep

Yes, I understand. But this was the best solution we came up with.

Thank you very much. As mentioned still less work than adding each one manually.

Just to implement something when starting the project so that it is not a lot of work later.

Kind regards

Sandeep

It seems like doing

[ContentType(AvailableInEditMode = false, GUID = "D8D1795B-1990-498E-A6A7-C5DF238E150A")]

on your block type does the trick? Is that not a simpler way to do it?