Can you define an interface such that a class that implements it must contain a member that is also of that class?

Question

Essentially what I want to do is impliment a class that can contain a list of references to instances of the same type. Something like the following:

interface IAccessibilityFeature
{
    List<IAccessibilityFeature> Settings { get; set; }
}

class MyAccess : IAccessibilityFeature
{
    List<MyAccess> Settings { get; set; }
}

I know this won't compile because the interface explicitly says my Settings must be of the type List<IAccessibilityFeature>. What I am after is some guidance as to the correct way to achieve what I'm trying to do in the MyAccess class.

Answer 1

Try this:

interface IAccessibilityFeature<T> where T : IAccessibilityFeature<T>
{
    List<T> Settings { get; set; }
}

class MyAccess : IAccessibilityFeature<MyAccess>
{
    List<MyAccess> Settings { get; set; }
}