C# create Object obj = new T()? [duplicate]

Answer 1

public void Add<T>() where T : A, new()
{
    aList.Add(new T());
}

Answer 2

Lee's answer is correct.

The reason is that in order to be able to call new T() you need to add a new() constraint to your type parameter:

void Add<T>() where T : new()
{
     ... new T() ...
}

You also need a constraint T : A so that you can add your object of type T to a List<A>.

Note: When you use new() together with other contraints, the new() constraint must come last.

Related

• Constraints on Type Parameters