Graphic.Attributes - can I make keys case insensitive?

[KirkKuykendall]

I've got several featurelayers with a foreign key column, some have Fk_Proj_ID, some with FK_PROJ_ID some with ...

Anyway, is there some way I can force the IDictionary<string,object> to use a case insensitive comparator?

[dotMorten_esri]

No. Keys are case sensitive by design.
Ensure that your services are all using the same casing prior to publishing the service.