E-slacker Posts - Answer Overflow

E-slacker

•Created by E-slacker on 7/9/2023 in #help

❔ How to return a generic interface whose only parameter is determined on runtime?

So, I've got this code, it doesn't compile but it clarifies what I want to do:

    private static IProblem<T>? GetProblem<T>(int day, T type)
    {
        try
        {
            var instance = Activator.CreateInstance(Problems[day]);
            return (IProblem<T>?)instance;
        }
        catch (Exception e)
        {
            Console.Error.WriteLine(e);
            return null;
        }
    }

    private static IProblem<T>? GetProblem<T>(int day, T type)
    {
        try
        {
            var instance = Activator.CreateInstance(Problems[day]);
            return (IProblem<T>?)instance;
        }
        catch (Exception e)
        {
            Console.Error.WriteLine(e);
            return null;
        }
    }

The variable instance is of type object, I want it to be of IProblem<T> where T is a generic parameter of an interface that Problems[day] implements. I've been butting my head with this code for quite a while, but I can't find something that works. How could I accomplish this with generics? Or do I have to go dynamic?

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