Implementing Select List Lookup ViewModel Attribute

Question

I'm trying to implement a more customisable version of using ViewModel attributes and a Model Enricher to populate viewmodels lists like in this this question and associated blog post.

I would like to be able to specify the method on my select list interface from the Attribute.

Each Select List service I have returns an IEnumerable that I use to make a select list and presently exposes an All interface as the sample does. I can easily use the All method because all interfaces provide that. However I often wish to able to use other methods like the AllTradingCompanies() AllManafacturingCompanies() methods of my select list class to get filtered lists.

It is presently looking like I may have to implement a Custom attribute to map to specific e.g. [AllCompanyList] attributes but that moves me away from the nice generic method that the existing version gives me. I guess I could use it to complement it but then its starting to lose some of the charm. I also am implementing IModelEnrichers which can do custom per view model logic.

Any thoughts on a nice way to implement this?

Answer 1

I implemented the solution using pairs of Attributes to define a requirement for data on a ViewModel and a provider of data a repository or a service within my domain. See my follow up question asking whether this is a good idea.