Question

I’ve the following method to search in Registry (don’t worry, it’s a test using generics):

private static T GetValue<T>(RegistryKey key, string name)
{
    using (key)
    {
        return (T)key.GetValue(name);
    }
}

But when using type : Nullable<bool> it fails because of an invalid cast.
(I tried on numeric keys only)

What I want is to have null if key not exists, false if 0 is stored in, or true else.

How can I achieve that?

Thanks !

Answer 1

because generics cannot utilize type-specific behavior, casts to or from a generic type parameter are assumed to be upcasts/downcasts.

a downcast fails here, you need a conversion.

you can try the Convert class, but better to make the type param match the registry type.