Using generics in abstract classes

Question

I\'m working on an abstract class where the implementing class needs to implement a list of T. The problem is that this doesn\'t work:

public class AbstractC         


        

Answer 1

You need the declaration on the class as well, to know what type T is:

public abstract class AbstractClass
{
    public int Id { get; set; }
    public int Name { get; set; }

    public abstract List Items { get; set; }
}

public class Container : AbstractClass
{
    public override List Items { get; set; }
}

You can also restrict what T can be, like say it must implement IWidgets:

public class AbstractClass where T : IWidgets