Question

this is somewhat the same question as I’ve asked some time ago:
How to let a method accept two types of data as argument?

Yet the current situation differs.. a lot.

Take this:

public FormResourceSelector(Dictionary<string, Effect> resourceList, string type)

Alright, nothing wrong with it.
Now I try to run this:

FormResourceSelector frs = new FormResourceSelector(AreaEffect.EFFECTS, "Area effect");
FormResourceSelector frs2 = new FormResourceSelector(DistanceEffect.EFFECTS, "Distance effect");

Both AreaEffect and DistanceEffect (custom classes) derive from Effect.

public class AreaEffect : Effect
{
    public static Dictionary<string, AreaEffect> EFFECTS = new Dictionary<string, AreaEffect>();
    ...
}

For some reason I get the following error while making the new FormResourceSelector instance:

Argument 1: cannot convert from 'System.Collections.Generic.Dictionary<string,SCreator.AreaEffect>' to 'System.Collections.Generic.Dictionary<string,SCreator.Effect>'  

at:

new FormResourceSelector(AreaEffect.EFFECTS, "Area effect");

I suspect the dictonary being a harass, but I don’t really know how to fix this.

EDIT: Easiest would be to allow input of both Dictionary and Dictionary as resourceList in the first code snippet I’ve given.

Answer 1

Why not make your class generic?

public class FormResourceSelector<T>
    where T : Effect
{
    public FormResourceSelector(Dictionary<string, T> resourceList, string type)
    {
    }
}