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我知道这个主题有很多问题,但我似乎找不到与我的场景有关的任何问题。DBContext在控制器中生成,仍然得到两个对象之间的关系...不同的ObjectContext对象
即时得到“两个对象之间的关系不能被定义,因为它们连接到不同的ObjectContext对象”上Inventory CurrentInventory = db.Inventories.Find(injection.InventoryID);
这工作很我第一次运行它,并随后尝试都失败。
我不明白我是如何获得不同的上下文对象。
我的控制器:
public class InventoriesController : Controller
{
private ApplicationDbContext db = new ApplicationDbContext();
// GET: Inventories/Edit
public ActionResult Edit()
{
return View(db.Inventories.ToList());
}
// POST: Inventories/Edit/5
// To protect from overposting attacks, please enable the specific properties you want to bind to, for
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(List<Inventory> inventory)
{
//List<Inventory> inventory
if (inventory == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
foreach (Inventory injection in inventory)
{
Inventory CurrentInventory = db.Inventories.Find(injection.InventoryID);
CurrentInventory.Date = DateTime.Now;
CurrentInventory.Quantity = injection.Quantity;
CurrentInventory.LastChangedBy = System.Web.HttpContext.Current.GetOwinContext().GetUserManager<ApplicationUserManager>().FindById(System.Web.HttpContext.Current.User.Identity.GetUserId());
}
if (ModelState.IsValid)
{
// db.Entry(inventory).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
return View(EntityState.Modified);
}
}
编辑:
我回到了一个较为单一更新方法,只是为了看看是否会有帮助。我仍然得到相同的错误。所以我将其与其他控制器之一进行了比较,修改了Edit方法,并注意到我没有使用.Find()方法,而是反复对它们记录自己并返回所需的对象。做这件事时,问题解决了。
// GET: Inventories/Edit/5
public ActionResult Edit(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Inventory inventory = db.Inventories.Find(id);
ViewData["Id"] = System.Web.HttpContext.Current.GetOwinContext().GetUserManager<ApplicationUserManager>().FindById(System.Web.HttpContext.Current.User.Identity.GetUserId());
if (inventory == null)
{
return HttpNotFound();
}
return View(inventory);
}
// POST: Inventories/Edit/5
// To protect from overposting attacks, please enable the specific properties you want to bind to, for
// more details see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit([Bind(Include = "InventoryID,Quantity,LastChanged,Date")] Inventory inventory)
{
Inventory oldInventory = null;
foreach (var a in db.Inventories)
{
if (a.InventoryID == inventory.InventoryID)
{
oldInventory = a;
}
}
if (oldInventory == null)
{
return HttpNotFound();
}
if (ModelState.IsValid)
{
//db.Entry(inventory).State = EntityState.Modified;
TryUpdateModel(oldInventory);
db.SaveChanges();
return RedirectToAction("Index");
}
return View(inventory);
}
后续问题:
是否.Find()方法在实施创建另一个的DbContext使返回的对象本身是从完全不同的环境?
你应该做库存CurrentInventorydb.Inventories.Find(x => x.InventoryID == injection.InventoryID); –