RouteTemplates.ParameterTypeAndConstraintsMismatch warning with custom types and model binding

Hi there,

I wonder how to proceed with correctly fixing the warning “Type of parameter 'userId' doesn't satisfy route constraints (e.g. 'GuidRouteConstraint')” that we get in Rider.

Setup:

• We define our routes with route constraints, e.g. [HttpGet("{userId:guid}")]
• The controller endpoint has a function parameter UserId userId.
• The custom type is defined as UserId : StrongGuid.
• We have a custom model binder that successfully processes the string from the route into the required StrongGuid type.

We already tried adding a StrongGuidRouteConstraint which's Match function does return true for any StrongGuid, hoping that the analyzer would pick it up somehow, but the warning remains. Is the connection between :guid and the Guid type hardcoded in the analyzer or can we influence that?

Kind regards,

Alex