What is the appropriate exception to throw for an Object being passed in and needing to be cast to the generic parameter?

Question

public IPredefinedInterface
{
    void DoSomething(Object obj);
}

public class MyClass<T> : IPredefinedInterface
{
    public void DoSomething(Object obj)
    {
        if (!(obj is T)) throw new ???

        SomeOtherFunc((T)obj);
    }
}

Not sure what the appropriate exception here is... ArgumentException, InvalidCastException, etc?

Answer 1

It's a problem with the argument, so ArgumentException. You haven't actually done the cast, so InvalidCastException is not appropriate.