如何在 ASP.NET MVC 中将一个表中的 ID 保存到另一个表中？

Question

我在将“slot_id”（自动递增主键）从 tb_parkingslots 传递到 tb_freeslot 并保存时遇到问题。

这是我的代码：

控制器：

// GET: Admin/Create
public ActionResult Addspace()
{
    return View();
}

// POST: Admin/Create
[HttpPost]
public ActionResult Addspace(FormCollection collection)
{
    try
    {
        tb_parkingslots add = new tb_parkingslots();
        add.slot_name = collection["name"];

        db.tb_parkingslots.Add(add);
        int i = db.SaveChanges();

        if (i > 0)
        {
           tb_freeslot addi = new tb_freeslot();
           addi.slot_id = Convert.ToInt32(collection["id"]); //which is auto increment - primary key in tb_parkingslots
           addi.slot_name = collection["name"];

           db.tb_freeslot.Add(addi);
           db.SaveChanges();

           ViewBag.s = "success";
           return View();
       }
       else
       {
           ViewBag.f = "failed";
           return View();
       }
   }
   catch
   {
       return View();
   }
}

Answer 1

当您将数据保存在 tb_parkingslots 表中时。 EF会自动填充对象的Id属性。

 tb_parkingslots add = new tb_parkingslots();
        add.slot_name = collection["name"];

        db.tb_parkingslots.Add(add);
        int i = db.SaveChanges(); // Here you will get the ID.

然后您可以使用此 ID 将数据保存在 tb_freeslot 表中。

tb_freeslot addi = new tb_freeslot();
           addi.slot_id = add.id; //which is slot ID when you saved data in tb_parkingslots
           addi.slot_name = collection["name"];

           db.tb_freeslot.Add(addi);
           db.SaveChanges();