Hi Stephen,

Instead of using route binding you could try using query binding:

[HttpGet()]
public ActionResult YourEndpoint(
    [FromQuery] string par_nuac,
    [FromQuery] string par_coac,
    [FromQuery] string par_noabac
    /* ... etc*/) {
}

I'm just writing this from memory, so I can't guarantee 100% that it works.
Also, I'm not sure if there's a limit to the number of parameter that can be bound this way.

You could also try model binding  and work with a C# object instead of over 28 parameters.

Regards,
Francisco

Thanks for the quick reply Francisco!

Unfortunately I have over 1,500 of these.  I'll see if I can do this for just the ones that are broken, but given I'm doing iterative experimentation with the migration, this could become rather laborious.

Yes scaffolding service & controller from model.