从一个 table 中求和 "Amount" 并显示在另一个 Table 中

Question

我有两个 table 名为：

tblPatientBill,

tblPatientBillDetails

我想做的是在 tblPatientBill 中的 ID“66”，在 tblPatientBillDetail 中有两条记录。从第二个 table 我想添加金额值并在主要 table 中显示为使用 linq 的总和值，我正在为此做这样的事情：

    public ActionResult Edit(PatientViewModel model)
            {
               List<tblPatientBillDetail> lst = new List<tblPatientBillDetail>();
               tblPatientBill tmp = new tblPatientBill();

               tmp = db.tblPatientBill.Where(x=>x.ID == PatientBillID && x.is_active == true).ToList();


                        lst = db.tblPatientBillDetails.Where(x=>x.PatientBillID == PatientBillID && x.is_active == true).ToList();

                        foreach (var test in lst)
                        {

                            model.Amount += lst.Amount;
                        }
                        Session["templist"] = lst;
}

然后将此会话值赋给 tblPatientBill table 的金额列。

这是我的 PatientViewModel：

public class PatientViewModel
    {
        public int ID { get; set; }
        public Nullable<int> PatientBillID { get; set; }
        public Nullable<double> Amount { get; set; }
        public Nullable<System.DateTime> CreatedAt { get; set; }
        public string CreatedBy { get; set; }
        public string Description { get; set; }
        public Nullable<bool> is_active { get; set; }
    }

tblPatientBillDetail:

   public partial class tblPatientBillDetail
    {
        public int ID { get; set; }
        public Nullable<int> PatientBillID { get; set; }
        public Nullable<double> Amount { get; set; }
        public Nullable<System.DateTime> CreatedAt { get; set; }
        public string CreatedBy { get; set; }
        public string Description { get; set; }
        public Nullable<bool> is_active { get; set; }

        public virtual tblPatientBill tblPatientBill { get; set; }
    }

tblPatientBill:

  public partial class tblPatientBill
    {
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public tblPatientBill()
        {
            this.tblPatientBillDetails = new HashSet<tblPatientBillDetail>();
        }

        public int ID { get; set; }
        public Nullable<int> PatientAppointmentID { get; set; }
        public string BillNo { get; set; }
        public Nullable<double> Amount { get; set; }
        public Nullable<double> Discount { get; set; }
        public Nullable<System.DateTime> CreatedAt { get; set; }
        public string CreatedBy { get; set; }
        public string Description { get; set; }
        public Nullable<bool> is_active { get; set; }

        public virtual tblPatientAppointment tblPatientAppointment { get; set; }
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<tblPatientBillDetail> tblPatientBillDetails { get; set; }
    }

我如何使用 linq.Thanks

实现此目的

Answer 1

针对特定的 PatientBill

var tblPatientBill = db.tblPatientBill.FirstOrDefault(x=>x.ID == PatientBillID && x.is_active == true);

if (tblPatientBill != null) {
    var lst = db.tblPatientBillDetails
          .Where(x=>x.ID == PatientBillID && x.is_active == true)
          .ToList();


    tblPatientBill.Amount = lst.Select(c => c.Amount).Sum();
}

所有患者账单

var tblPatientBills = db.tblPatientBill.Where(x=> x.is_active == true).ToList();

if (tblPatientBills.Count != 0) {
    var lst = db.tblPatientBillDetails
          .Where(x=>x.PatientBillID == PatientBillID && x.is_active == true)
          .ToList();

    foreach(var patientBill in tblPatientBills)
    {
        patientBill.Amount = lst.Where(b => b.PatientBillId == PatientBillID).Select(c => c.Amount).Sum();
    }
}

从一个 table 中求和 "Amount" 并显示在另一个 Table 中

Sum "Amount" from one table and display in Another Table

linq

linq-to-sql

asp.net-mvc-4

entity-framework-6