Overwrite customattribute on derived class

Question

We have a custom attribute

[AttributeUsage(AttributeTargets.All, AllowMultiple = true)]
public class CustomDesignerAttribute: Attribute

the

Answer 1

No, it's not possible to override the existing attribute.

Attributes are metadata attached to an object (assembly, class, method, variable and so on) so they always keep this connection.

If you want to give a default "behavior" in the base class and override it in some derived classes you have to check all the attributes returned by GetCustomAttributes() to use only the most derived one (the first in the list).