Многократная сортировка по методу LINQ (вложенный)

Question

У меня есть метод LINQ ниже, который вызывается из User Control и выводится прямо в стандартный DataGridView. Мои пользователи хотят, чтобы он по умолчанию сортировался сначала по DisenrollmentDate, а затем Member Name. Прямо сейчас, с кодом ниже, он сортирует ТОЛЬКО по DisenrollmentDate.

---

BLLCmo.cs

    public static DataTable GetAllMembers(Guid workerID)
    {
        var AllEnrollees = from enrollment in context.tblCMOEnrollments
                               where enrollment.CMOSocialWorkerID == workerID || enrollment.CMONurseID == workerID
                               join supportWorker in context.tblSupportWorkers on enrollment.EconomicSupportWorkerID equals supportWorker.SupportWorkerID into workerGroup
                               from worker in workerGroup.DefaultIfEmpty()
                               orderby enrollment.DisenrollmentDate ascending 
                               select new
                                       {
                                           enrollment.ClientID,
                                           MemberName = BLLConnect.MemberName(enrollment.ClientID),
                                           NurseName = BLLAspnetdb.NurseName(enrollment.CMONurseID),
                                           SocialWorkerName =BLLAspnetdb.SocialWorkerName(enrollment.CMOSocialWorkerID),
                                           enrollment.DisenrollmentDate,
                                           enrollment.EnrollmentDate,
                                           ESFirstName = worker.FirstName,
                                           ESLastName = worker.LastName,
                                           ESPhone = worker.Phone
                                       };

        var dataTable = AllEnrollees.CopyLinqToDataTable();

        return dataTable;
    }

---

BLLConnect.cs

    public static String MemberName(Int32 personID)
    {
        var memberName = from person in context.tblPersons
                         where person.PersonID == personID
                         orderby person.LastName ascending 
                         select person.FirstName + " " + person.LastName;

        return memberName.SingleOrDefault();
    }

Answer 1

Вы можете добавить больше предложений заказа в вашем операторе orderby, разделенных запятой.

    public static DataTable GetAllMembers(Guid workerID)
    {
        var AllEnrollees = from enrollment in context.tblCMOEnrollments
                               where enrollment.CMOSocialWorkerID == workerID || enrollment.CMONurseID == workerID
                               join supportWorker in context.tblSupportWorkers on enrollment.EconomicSupportWorkerID equals supportWorker.SupportWorkerID into workerGroup
                               from worker in workerGroup.DefaultIfEmpty()
                               let memberName = BLLConnect.MemberName(enrollment.ClientID)
                               orderby enrollment.DisenrollmentDate ascending, memberName ascending
                               select new
                                       {
                                           enrollment.ClientID,
                                           MemberName = memberName,
                                           NurseName = BLLAspnetdb.NurseName(enrollment.CMONurseID),
                                           SocialWorkerName =BLLAspnetdb.SocialWorkerName(enrollment.CMOSocialWorkerID),
                                           enrollment.DisenrollmentDate,
                                           enrollment.EnrollmentDate,
                                           ESFirstName = worker.FirstName,
                                           ESLastName = worker.LastName,
                                           ESPhone = worker.Phone
                                       };

        var dataTable = AllEnrollees.CopyLinqToDataTable();

        return dataTable;
    }

Обратите внимание, что я использовал ключевое слово let, чтобы извлечь memberName один раз, а затем использовать его как для упорядочения, так и для возвращаемого значения.