Only primitive types ('such as Int32, String, and Guid') are supported in this context

Question

I\'m getting the following error:

Unable to create a constant value of type \'Phoenix.Intranet.Web.ClientSettings.ComponentRole\'. Only primitiv

Answer 1

EntityFramework and Linq to SQL both try to translate such queries which a part is in memory and the other part is in Database, to sql IN operator.

and because your class which roles is an IEnumerable of is not a primitive type it cannot be translated to SQL query.

you should first fetch from database to memory and then join two lists in memory.

for example:

 var vla =  (from cir in phoenixEntities.ComponentInRoles.ToList()
                     join role in roles on cir.RoleId equals role.RoleId
                     where cir.ComponentId == cmpent1.ComponentId
                         select role).ToList();

I hope I helped