public List <Annal> GetAll(Expression <Func <Annal, bool> > filter = null)
 {
     using (AnnalContext context = new AnnalContext(_tenantResolver))
     {
         return(filter == null
             ? context.Set <Annal>().ToList()
             : context.Set <Annal>().Where(filter).ToList());
     }
 }
 public Annal Get(Expression <Func <Annal, bool> > filter)
 {
     using (AnnalContext context = new AnnalContext(_tenantResolver))
     {
         return(context.Set <Annal>().SingleOrDefault(filter));
     }
 }