Most important things about C# generics… lesson learned [closed]

Answer 1

Two interesting lessons. First; with lists; try to think in terms of T; for full details see here, but in short you need to use:

public void Foo(IList data) where T : SomeBaseClassOrInterface {}

and not:

public void Foo(IList data) {}

---

Second: watch for the edge cases ;-p

Can you see the trap here?

static void Foo() where T : new()
{
    T t = new T();
    Console.WriteLine(t.ToString()); // works fine
    Console.WriteLine(t.GetHashCode()); // works fine
    Console.WriteLine(t.Equals(t)); // works fine

    // so it looks like an object and smells like an object...

    // but this throws a NullReferenceException...
    Console.WriteLine(t.GetType()); // BOOM!!!
}