Question

I am using Linq to entity and have the following query

IQueryable<DomainModel.User> userResult = 
      userResult.OrderBy(u => u.UserClientRoles.OrderBy(r => r.Role.RoleName));

But I am getting this error

DbSortClause expressions must have a type that is order comparable

parameter Name :Key

and it returns an empty collection.

Any idea what’s going on?

Answer 1

.OrderBy(), when working with databases, is supposed to take in a delegate that returns only a single property that represents a column in your database. I’m not sure what you’re trying to do, but it looks like

u.UserClientRoles.OrderBy(r => r.Role.RoleName)

Will return an enumeration of values, which can’t be ordered.