编译查询中是否可以使用Switch语句?

kyndigs 在他的评论中,唯一的解决方法是用 ? :

        internal static readonly Func<MyEntities, long, MessageSortField, int, int, IQueryable<Model.Message>> MessagesPagedSortedAscQuery =
        CompiledQuery.Compile((MyEntities db, long folderId, MessageSortField sortField, int skip, int take) =>
        (
            sortField == MessageSortField.Date ? db.Messages.Where(e => e.FolderId == folderId).OrderBy(m => m.Date).Skip(skip).Take(take) :
            sortField == MessageSortField.Subject ? db.Messages.Where(e => e.FolderId == folderId).OrderBy(m => m.Subject).Skip(skip).Take(take) :
            sortField == MessageSortField.From ? db.Messages.Where(e => e.FolderId == folderId).OrderBy(m => m.From).Skip(skip).Take(take) :
            db.Messages.Where(e => e.FolderId == folderId).Skip(skip).Take(take)
        ));