Activator.CreateInstance(Type) for a type without parameterless constructor [duplicate]

Answer 1

This may not be feasible for you to do, but the simplest thing is to pass the argument list after the type like so:

Activator.CreateInstance(t, "name");

You'll want to think about what f() is really trying to do. Should it be instantiating an object of type A at all? What other classes will it instantiate?

One possibility is to have a switch statement within f() which passes the correct parameters to CreateInstance() for class A. This won't scale, but that may not be an issue for you.