Question

我正在使用Entity Framework 5在MVC 4应用程序中访问SQL Server 2008 R2中的数据。这是我的T_Attribute类：

    public partial class T_Attribute
{
    public T_Attribute()
    {
        this.T_Characteristic = new HashSet<T_Characteristic>();
        this.T_Category = new HashSet<T_Category>();
    }

    [Key]
    public int AttributeId { get; set; }

    public string Descr { get; set; }
    public Nullable<bool> HasCharacteristics { get; set; }

    public virtual ICollection<T_Characteristic> T_Characteristic { get; set; }
    public virtual ICollection<T_Category> T_Category { get; set; }
}

我的确切错误是＆＃34;实体类型＆＃39;属性＆＃39;没有定义键。定义此EntityType的键。＆＃34;。在我的其他实体类中，通过添加[Key]参数

解决了这个问题

变量与数据库中的名称完全相同。

谢谢你的帮助。

堆栈追踪：

[ModelValidationException：检测到一个或多个验证错误   在模型生成期间：

\ tSystem.Data.Entity.Edm.EdmEntityType :: EntityType＆＃39;属性＆＃39;具有   没有键定义。定义此EntityType的键。   \ tSystem.Data.Entity.Edm.EdmEntityType：Name：指定的名称是   不允许：＆＃39; __ DynamicallyInvokableAttribute＆＃39;。   \ tSystem.Data.Entity.Edm.EdmEntitySet：EntityType：EntitySet   ＆＃39; T_Attribute1＆＃39;基于类型＆＃39;属性＆＃39;没有定义键。   ]
  System.Data.Entity.ModelConfiguration.Edm.EdmModelExtensions.ValidateAndSerializeCsdl（EdmModel   model，XmlWriter writer）+114
  System.Data.Entity.ModelConfiguration.Edm.EdmModelExtensions.ValidateCsdl（EdmModel   型号）+77
  System.Data.Entity.DbModelBuilder.Build（DbProviderManifest   providerManifest，DbProviderInfo providerInfo）+218
  System.Data.Entity.DbModelBuilder.Build（的DbConnection   providerConnection）+107
  System.Data.Entity.Internal.LazyInternalContext.CreateModel（LazyInternalContext   internalContext）+143
  System.Data.Entity.Internal.RetryLazy 2.GetValue(TInput input) +171 System.Data.Entity.Internal.LazyInternalContext.InitializeContext() +498 System.Data.Entity.Internal.InternalContext.Initialize() +31 System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) +39 System.Data.Entity.Internal.Linq.InternalSet 1.Initialize（）+137
  System.Data.Entity.Internal.Linq.InternalSet 1.get_InternalContext() +38 System.Data.Entity.Infrastructure.DbQuery 1.System.Linq.IQueryable.get_Provider（）   +84 System.Linq.Queryable.Select（IQueryable 1 source, Expression 1选择器）+66
  HP.GPS.ClearingCenter.Application.Products.CategoryDataService.GetAllCategories（）   在 FilepathToSolution .Application \ Products \ CategoryDataService.cs：22   HP.GPS.ClearingCenter.Web.ViewModels.Home.IndexViewModel.Initialize（）   在 FilepathToSolution .Web \ ViewModels \ Home \ IndexViewModel.cs：27
  解决方案 .Web.Controllers.HomeController.Search（）in FilepathToSolution .Web \ Controllers \ HomeController.cs：22 lambda_method（Closure，ControllerBase，Object []）+101 <登记/>   System.Web.Mvc.ActionMethodDispatcher.Execute（ControllerBase   controller，Object []参数）+59
  System.Web.Mvc.ReflectedActionDescriptor.Execute（ControllerContext   controllerContext，IDictionary 2 parameters) +434 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary 2   参数）+60
  System.Web.Mvc.Async.AsyncControllerActionInvoker.InvokeSynchronousActionMethod（ControllerContext   controllerContext，ActionDescriptor actionDescriptor，IDictionary 2 parameters) +50 System.Web.Mvc.Async.<>c__DisplayClass42.<BeginInvokeSynchronousActionMethod>b__41() +75 System.Web.Mvc.Async.<>c__DisplayClass8 1.b__7（IAsyncResult）   _）+44 System.Web.Mvc.Async.WrappedAsyncResult 1.End() +139 System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +102 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +49 System.Web.Mvc.Async.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33() +126 System.Web.Mvc.Async.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() +323 System.Web.Mvc.Async.<>c__DisplayClass37.<BeginInvokeActionMethodWithFilters>b__36(IAsyncResult asyncResult) +44 System.Web.Mvc.Async.WrappedAsyncResult 1.End（）   +139 System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult asyncResult，Object tag）+102
  System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters（IAsyncResult的   asyncResult）+50
  System.Web.Mvc.Async＆LT;＆GT; c__DisplayClass2a.b__20（）   +68 System.Web.Mvc.Async。＆lt;＆gt; c__DisplayClass25.b__22（IAsyncResult   asyncResult）+184 System.Web.Mvc.Async.WrappedAsyncResult 1.End() +136 System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +56 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +40 System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +40 System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +47 System.Web.Mvc.Async.WrappedAsyncResult 1.End（）+151
  System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult asyncResult，   对象标签）+59
  System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult asyncResult，   对象标签）+40
  System.Web.Mvc.Controller.EndExecuteCore（IAsyncResult asyncResult）+44   System.Web.Mvc.Async＆LT;＆GT; c__DisplayClass4.b__3（IAsyncResult的   ar）+47 System.Web.Mvc.Async.WrappedAsyncResult 1.End() +151 System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +59 System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40 System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +39 System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +39 System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +45 System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +47 System.Web.Mvc.Async.WrappedAsyncResult 1.End（）+151
  System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult asyncResult，   对象标签）+59
  System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult asyncResult，   对象标签）+40
  System.Web.Mvc.MvcHandler.EndProcessRequest（IAsyncResult asyncResult）   +40 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest（IAsyncResult）   结果）+38
  System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute（）   +9651188 System.Web.HttpApplication.ExecuteStep（IExecutionStep step，Boolean＆amp; completedSynchronously）+155

Answer 1

删除数据库并转到Code-First解决了我的问题。谢谢你的帮助。

EntityType＆＃39;属性＆＃39;即使[key]已定义

1 个答案: