Difference between interface as type constraint and interface as parameter?

Question

If I wanted to create a method that takes an instance of IList as a parameter (or any other interface, but let\'s use IList as an example), I could cre

Answer 1

Reagrding your example I would prefer the second approach. Generic methods or classes are mostly used when the caller can use them with more than on type as in your example. In this case you can avoid a base class (e.g. object) as return value and provide type safe return values. On simple sample

public class Foo
{
    public T GetSomething()
    {
        return default(T);
    }
}