Question

I have problem with searching.
So, I have Task entity and Owner Entity. They are in many-to-many relationships.
My target – find all Tasks by some Owner. In entity framework datamodel there’s no relationship table as outstanding entity.
I create linq-filter expression, but I can’t include in it rule for Owners. I tried to use some lambda expression, but compiler asked me to use simple types and no “Owners”.

            Expression<Func<Task, bool>> filter = e =>
                (String.IsNullOrEmpty(filterData.Title) || e.Title.StartsWith(filterData.Title))
               && (isDueDateSkipped || (DateTime.Compare(dueDate, e.DueDate ?? now) == 0))                       
               && (isCloseDateSkipped || (DateTime.Compare(closeDate, e.CloseDate ?? now) == 0))
               && (isTypeSkipped || e.Type.Id == typeId)
               && (isStatusSkipped || e.Status.Id == statusId)
               && (isPrioritySkipped || e.Priority.Id == priorityId)
               && (isMemberSkipped || e.Member.Id == memberId);

Could you please help me?

Answer 1

I found answer for my issue:

  Expression<Func<Task, bool>> filter = e =>
                   (String.IsNullOrEmpty(filterData.Title) || e.Title.StartsWith(filterData.Title))
                   && (isDueDateSkipped || (DateTime.Compare(dueDate, e.DueDate ?? now) == 0))
                   && (isCloseDateSkipped || (DateTime.Compare(closeDate, e.CloseDate ?? now) == 0))
                   && (isTypeSkipped || e.Type.Id == typeId)
                   && (isStatusSkipped || e.Status.Id == statusId)
                   && (isPrioritySkipped || e.Priority.Id == priorityId)
                   && (isMemberSkipped || e.Member.Id == memberId)
                   && (isOwnerSkipped || e.Owners.Select(o => o.Id).Contains(ownerId));
        return filter;