Question

我正在编写一个C＃MVC5互联网应用程序，并使用以下属性作为模型中的主键：

[Key]
public long id { get; set; }

我编写了一个上下文类，创建了一个带有视图的控制器，当我浏览到索引操作结果时，我收到了这个错误：

The 'id' property on 'MapCompany' could not be set to a 'System.Int32' value. You must set this property to a non-null value of type 'System.Int64'.

在这行代码中：

return View(await db.mapCompanies.ToListAsync());

如何让此代码正常工作？

提前致谢

修改

这是堆栈跟踪的顶部：

[InvalidOperationException: The 'Id' property on 'MapCompany' could not be set to a 'System.Int32' value. You must set this property to a non-null value of type 'System.Int64'. ]
   System.Data.Entity.Core.Common.Internal.Materialization.ErrorHandlingValueReader`1.GetValue(DbDataReader reader, Int32 ordinal) +392
   System.Data.Entity.Core.Common.Internal.Materialization.Shaper.GetPropertyValueWithErrorHandling(Int32 ordinal, String propertyName, String typeName) +105
   lambda_method(Closure , Shaper ) +133
   System.Data.Entity.Core.Common.Internal.Materialization.Shaper.HandleEntityAppendOnly(Func`2 constructEntityDelegate, EntityKey entityKey, EntitySet entitySet) +737
   lambda_method(Closure , Shaper ) +378
   System.Data.Entity.Core.Common.Internal.Materialization.Coordinator`1.ReadNextElement(Shaper shaper) +280
   System.Data.Entity.Core.Common.Internal.Materialization.<MoveNextAsync>d__4.MoveNext() +441
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52
   System.Runtime.CompilerServices.ConfiguredTaskAwaiter.GetResult() +24

在MVC5模型中使用long作为主键

0 个答案: