Question

控制器：

public ActionResult Index()
{
        var Cs = new List<Customer>();

        using (JoinEntities db = new JoinEntities())
        {
            Cs = (from p in db.Customers
                  join e in db.Orders on p.ID equals e.Customer_id
                  where p.Name == "Rama"
                  select p).ToList();
        }

        return View(Cs);
}

查看：

@model IEnumerable<JOIN.Models.Customer>
@{
    ViewBag.Title = "Home Page";
}
<table class="table table-condensed table-hover">
   <thead>
     <tr>
        <td>First Name</td>
        <td>salary</td>
        <td>age</td>
        <td>amount</td>
    </tr>
   </thead>
   <tbody>
   @foreach (var per in Model)
   {
     <tr>
        <td>@per.ID</td>
        <td>@per.Name</td>
        <td>@per.Age</td>
        <td>@per.Amount</td>
     </tr>
    }
</tbody>
</table>

上面的代码视图是仅占用一个表列，如何才能获得客户表中的其他表列？id是主键，而订单表customer_id是外键

customer表：id，姓名，年龄，薪水列
order表：oid，日期，customer_id，金额列

Answer 1

您需要创建另一个模型

class MyModel{
     public string Name{get;set;}
     public DateTime Date {get;set;}
}

并更改选择查询：

var Cs = new List<MyModel>();

using (JoinEntities db = new JoinEntities())
        {
            Cs = (from p in db.Customers
                  join e in db.Orders on p.ID equals e.Customer_id
                  where p.Name == "Rama"
                  select new MyModel {
                     Name = p.Name,
                     Date = e.date
                  }).ToList();
        }

Answer 2

如下创建另一个视图模型

Rails.cache.fetch(key, &block)
#                      ↑

并如下更新您的Index方法

public class CustomerOrderViewModel
    {
        public int CustomerId { get; set; }
        public string Name { get; set; }
        public int Age { get; set; }
        public double  Salary { get; set; }

        public int OrderId { get; set; }
        public DateTime Date { get; set; }
        public double  Amount { get; set; }
    }

并将视图的视图模型更改为

public ActionResult Index() { using (JoinEntities db = new JoinEntities()) { var customerOrderList = (from p in db.Customers join e in db.Orders on p.ID equals e.Customer_id where p.Name == "Rama" select new CustomerOrderViewModel { CustomerId = p.Id, Name = p.Name, Age= p.Age, Salary = p.Salary, OrderId= e.Id, Date= e.Date, Amount = e.Amount }).ToList(); return View(customerOrderList); } }

如何使用实体框架连接两个表

2 个答案: