在数组中查找项的成员属性

我已经将整个sale对象传递给了这个函数。在sale对象中，有许多子项，例如saleOrderItem、Payment、User。。。

sale.papayment是一个数组

问题：1） 如何从"sale.payment"对象获取CodeNo？（因为支付是一个数组）
2） 如何获得sale.payment.CourseByTutor.TutorId（因为付款是一个数组）

  public static object GetSalesDataBySaleOrderID(SaleOrder sale)
        {
            return sale.saleOrderItem
                       .Where(s => s != null)
                       .Select(s => new { 
                                          Id = s.Id,
                                          Username = sale.User.GetSingleUserById(s.UserId).Name,
                                          Amount = s.Amount,
                                          CodeNo = s.SaleOrder.payment.First().CodeNo,
                                          TutorName = sale.User.GetSingleUserById(s.SaleOrder.payment.FirstOrDefault().CourseByTutor.TutorId).Name,
                                        })
                       .ToList();
        }

以下是我如何将值绑定到对象

 private void SaveValueToObject()
    {
        saleOrder.UserId = UserInfo.Id;
        saleOrder.Date = DateTime.Now;            
        for (int i = 0; i < dgSale.Rows.Count; i++)
        {
            SaleOrderItem SaleItem = new SaleOrderItem();
            SaleItem.InventoryTypeId = Convert.ToInt32(dgSale.Rows[i].Cells["inventoryTypeId"].Value);
            SaleItem.InventoryOrCourseId = Convert.ToInt32(dgSale.Rows[i].Cells["inventoryId"].Value);
            SaleItem.Qty = Convert.ToInt32(dgSale.Rows[i].Cells["qty"].Value);
            SaleItem.Amount = Convert.ToDecimal(dgSale.Rows[i].Cells["total"].Value);
            SaleItem.UserId = Convert.ToInt32(dgSale.Rows[i].Cells["userId"].Value);
            SaleItem.Discount = Convert.ToDecimal(dgSale.Rows[i].Cells["discount"].Value);
            SaleItem.Remarks = (dgSale.Rows[i].Cells["remark"].Value == null) ? "" : dgSale.Rows[i].Cells["remark"].Value.ToString();
            SaleItem.Status = (int)SaleOrderStatus.Active;
            saleOrder.saleOrderItem[i] = SaleItem;                

            Payment p = new Payment();
            p.PayType = Convert.ToInt32(dgSale.Rows[i].Cells["payType"].Value);
            p.Code = (int)PaymentCode.RCT; // For Receipt prefix
            p.CodeNo = p.GetNewReceiptNo(p.Code); //Check if it is receipt, if yes, Get last Receipt No + 1
            p.UserId = (txtUserId.Text == string.Empty) ? 0 : Convert.ToInt32(txtUserId.Text);
            p.Amount = Convert.ToDecimal(dgSale.Rows[i].Cells["total"].Value);
            p.Remark = (dgSale.Rows[i].Cells["remark"].Value == null) ? "" : dgSale.Rows[i].Cells["remark"].Value.ToString();
            p.PaymentMethodId = saleOrder.PaymentMethodId;
            p.DateIssue = saleOrder.Date;
            p.CourseByTutor.TutorId = Convert.ToInt32(dgSale.Rows[i].Cells["tutorId"].Value);

            saleOrder.payment[i] = p;
        }
    }