C# Cannot convert from IEnumerable<Base> to IEnumerable

Question

I recently run into trouble when trying to AddRange(IEnumerable) to a List. Probably a classic issue, but I do not really get it yet.

I understand that methods expec

Answer 1

In C# 3.0 you can use the "Cast" extension method. If you import System.Linq and then use this code:

public void AddRange2(IEnumerable foos) where T : Foo
{
    m_Foos.AddRange (foos.Cast());
}

Then it should work for you.