即使我将DbUpdateConcurrencyException
传递给OrderID
表单,我也收到OrderItem
错误。它适用于Create
和Delete
,但它一直在为Edit
踢我。任何人都可以建议修复或让我知道我做错了什么?
我得到了Concurrency Exception Error
:
System.Data.Entity.Infrastructure.DbUpdateConcurrencyException是 用户代码未处理HResult = -2146233087消息=存储更新, insert或delete语句影响了意外的行数(0)。 自实体加载后,实体可能已被修改或删除。 有关的信息,请参阅http://go.microsoft.com/fwlink/?LinkId=472540 理解和处理乐观并发异常 Source = EntityFramework StackTrace: 在System.Data.Entity.Internal.InternalContext.SaveChanges() 在System.Data.Entity.Internal.LazyInternalContext.SaveChanges() 在System.Data.Entity.DbContext.SaveChanges() 在C:\ Users \ Luffy \ Desktop \ HealthHabitat中的HealthHabitat.Controllers.OrderItemController.Edit(OrderItem orderItem) V25 \ HealthHabitat \ Controllers \ OrderItemController.cs:第97行 在lambda_method(Closure,ControllerBase,Object []) 在System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase控制器,Object []参数) 在System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext,IDictionary
2 parameters) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary
2 参数) 在System.Web.Mvc.Async.AsyncControllerActionInvoker.ActionInvocation.InvokeSynchronousActionMethod() 在System.Web.Mvc.Async.AsyncControllerActionInvoker.b__39(IAsyncResult) asyncResult,ActionInvocation innerInvokeState) 在System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult2.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase
1.End() 在System.Web.Mvc.Async.AsyncResultWrapper.End [TResult](IAsyncResult) asyncResult,Object标签) 在System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult) asyncResult) 在System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.b__3d() 在System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters。&lt;&gt; c__DisplayClass46.b__3f() InnerException:System.Data.Entity.Core.OptimisticConcurrencyException 的HResult = -2146233087 Message =存储更新,插入或删除语句影响了意外的行数(0)。实体可能已被修改或 自实体加载后删除。看到 http://go.microsoft.com/fwlink/?LinkId=472540了解有关的信息 理解和处理乐观并发异常。 来源=的EntityFramework 堆栈跟踪: 在System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.ValidateRowsAffected(Int64) rowsAffected,UpdateCommand source) 在System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.Update() 在System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.b__2(UpdateTranslator) UT) 在System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update [T](T noChangesResult,Func2 updateFunction) at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update() at System.Data.Entity.Core.Objects.ObjectContext.<SaveChangesToStore>b__35() at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func
1 func,IDbExecutionStrategy executionStrategy,Boolean startLocalTransaction,Boolean releaseConnectionOnSuccess) 在System.Data.Entity.Core.Objects.ObjectContext.SaveChangesToStore(SaveOptions) options,IDbExecutionStrategy executionStrategy,Boolean startLocalTransaction) 在System.Data.Entity.Core.Objects.ObjectContext。&lt;&gt; c__DisplayClass2a.b__27() 在System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute [TResult](Func`1 操作) 在System.Data.Entity.Core.Objects.ObjectContext.SaveChangesInternal(SaveOptions options,Boolean executeInExistingTransaction) 在System.Data.Entity.Core.Objects.ObjectContext.SaveChanges(SaveOptions 选项) 在System.Data.Entity.Internal.InternalContext.SaveChanges() 的InnerException:
控制器:
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit([Bind(Include = "OrderItemID,OrderID,ItemID,Quantity")] OrderItem orderItem)
{
if (ModelState.IsValid)
{
db.Entry(orderItem).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Details", "Order", new { id = orderItem.OrderID });
}
ViewBag.ItemID = new SelectList(db.Items, "ItemID", "Name", orderItem.ItemID);
ViewBag.OrderID = new SelectList(db.Orders, "OrderID", "OrderID", orderItem.OrderID);
return View(orderItem);
}
修改视图:
@using (Html.BeginForm(new { OrderID = Model.OrderID }))
{
@Html.AntiForgeryToken()
<div class="panel panel-warning">
<div class="panel-heading">
<h4><i class="fa fa-edit"></i> Edit</h4>
</div>
<div class="panel-body">
<div class="form-horizontal">
<hr />
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
@Html.HiddenFor(model => model.OrderID)
<div class="form-group">
@Html.LabelFor(model => model.ItemID, "Item Name", htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("ItemID", null, htmlAttributes: new { @class = "form-control"})
@Html.ValidationMessageFor(model => model.ItemID, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Quantity, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.Quantity, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.Quantity, "", new { @class = "text-danger" })
</div>
</div>
<hr />
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<a href="@Url.Action("Details", "Order", new { id = Model.OrderID }, null)" class="btn btn-default">Cancel</a>
<input type="submit" value="Save" class="btn btn-warning"/>
</div>
</div>
</div>
</div>
</div>
}
型号:
public class OrderItem
{
public int OrderItemID { get; set; }
public int OrderID { get; set; }
public int ItemID { get; set; }
[Range(1, 30, ErrorMessage = "{0} must be between {1} and {2}.")] // is this a row version?? I'm not sure, I'm kinda new to MVC
public int Quantity { get; set; }
public virtual Order Order { get; set; }
public virtual Item Item { get; set; }
}
获取编辑方法
// GET: OrderItem/Edit/5
public ActionResult Edit(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
OrderItem orderItem = db.OrderItems.Find(id);
if (orderItem == null)
{
return HttpNotFound();
}
ViewBag.ItemID = new SelectList(db.Items, "ItemID", "Name", orderItem.ItemID);
ViewBag.OrderID = new SelectList(db.Orders, "OrderID", "OrderID", orderItem.OrderID);
return View(orderItem);
}
答案 0 :(得分:1)
您必须将RowVersion属性放在视图上,然后将其发送到控制器:
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
@Html.HiddenFor(model => model.OrderID)
@Html.HiddenFor(model => model.RowVersion)
控制器
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit([Bind(Include = "OrderItemID,OrderID,ItemID,Quantity,RowVersion")] OrderItem orderItem)
{
if (ModelState.IsValid)
{
db.Entry(orderItem).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Details", "Order", new { id = orderItem.OrderID });
}
ViewBag.ItemID = new SelectList(db.Items, "ItemID", "Name", orderItem.ItemID);
ViewBag.OrderID = new SelectList(db.Orders, "OrderID", "OrderID", orderItem.OrderID);
return View(orderItem);
}
请注意,未在视图上修改的属性将为空。最好指定修改后的属性。
//db.Entry(orderItem).State = EntityState.Modified;
db.Entry(orderItem).Property(i => i.Quantity).IsModified = true;
//...
修改强>
仅用于测试目的,而不是
@using (Html.BeginForm(new { OrderID = Model.OrderID }))
尝试
@using (Html.BeginForm())
{
@Html.HiddenFor(i => i.OrderID)
}
编辑2
更改您的GET操作:
// GET: OrderItem/Edit/5
public ActionResult Edit(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
OrderItem orderItem = db.OrderItems.Find(id);
if (orderItem == null)
{
return HttpNotFound();
}
ViewBag.DDL_ItemID = db.Items.Select(i => new SelectListItem { Text = i.Name, Value = i.ItemID.ToString() }).ToList();
ViewBag.DDL_OrderID = db.Orders.Select(i => new SelectListItem { Text = i.OrderID.ToString(), Value = i.OrderID.ToString() }).ToList();
return View(orderItem);
}
不要使用与Model属性名称相同的ViewBag属性
更改视图中的DropDownList:
@Html.DropDownListFor(i => i.ItemID, (IEnumerable<SelectListItem>)ViewBag.DDL_ItemID, new { @class = "form-control"})
在视图中,您在哪里放置了OrderItemID?你必须把它放在那里。