C# using Generics both in the Interface and its implementor class

Question

I want to create an interface that works for all the IComparable types. For example

public interface SortAlgorithm where T : System.IComparable

        

Answer 1

All derived generic classes will also have to implement the generic constraint.

Therefore, you should declare the class as:

public class InsertionSort<T> : SortAlgorithm<T> where T : System.IComparable<T>

What the error basically says is that the generic parameter T (which at this point can be any class or struct) is not guaranteed to implement IComparable<T>, as constrained by the base class (the SortAlgorithm interface).

You can provide this guarantee by specifying the constraint on the InsertionSort class as well, as presented above.