关于 c#:error loading database initializer with EF6

error loading database initializer with EF6

我一直在尝试遵循本教程 ... http://www.asp.net/mvc/tutorials/getting-started-with-ef-using-mvc/creating-an-entity-framework-data- model-for-an-asp-net-mvc-application 但我不断收到以下错误...

system.invalidoperationexception = {"Failed to set database
initializer of type 'WeddingPreparations.Dal.WeddingInitializer,
KevinLisaWedding' for DbContext type
'WeddingPreparations.Dal.WeddingContext' specified in the application
configuration. See inner exception for details."}

内部异常是...

{"Could not load type 'WeddingPreparations.Dal.WeddingContext' from
assembly 'EntityFramework, Version=6.0.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089'.":"WeddingPreparations.Dal.WeddingContext"}

堆栈跟踪是...

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at System.Data.Entity.Internal.InitializerConfig.TryGetInitializer(Type requiredContextType, String contextTypeName, String initializerTypeName, Boolean isDisabled, Func`1 initializerArgs, Func`3 exceptionMessage)
at System.Data.Entity.Internal.InitializerConfig.<>c__DisplayClass6.<TryGetInitializerFromEntityFrameworkSection>b__1(ContextElement e)
at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)
at System.Data.Entity.Internal.InitializerConfig.TryGetInitializerFromEntityFrameworkSection(Type contextType)
at System.Data.Entity.Internal.InitializerConfig.TryGetInitializer(Type contextType)
at System.Data.Entity.Infrastructure.DependencyResolution.AppConfigDependencyResolver.GetServiceFactory(Type type, String name)
at System.Data.Entity.Infrastructure.DependencyResolution.AppConfigDependencyResolver.<>c__DisplayClass1.<GetService>b__0(Tuple`2 t)
at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
at System.Data.Entity.Infrastructure.DependencyResolution.AppConfigDependencyResolver.GetService(Type type, Object key)
at System.Data.Entity.Infrastructure.DependencyResolution.ResolverChain.<>c__DisplayClass3.<GetService>b__0(IDbDependencyResolver r)
at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)
at System.Data.Entity.Infrastructure.DependencyResolution.ResolverChain.GetService(Type type, Object key)
at System.Data.Entity.Infrastructure.DependencyResolution.CompositeResolver`2.GetService(Type type, Object key)
at System.Data.Entity.Infrastructure.DependencyResolution.DbDependencyResolverExtensions.GetService(IDbDependencyResolver resolver, Type type)
at System.Data.Entity.Internal.InternalContext.PerformDatabaseInitialization()
at System.Data.Entity.Internal.LazyInternalContext.<InitializeDatabase>b__4(InternalContext c)
at System.Data.Entity.Internal.RetryAction`1.PerformAction(TInput input)
at System.Data.Entity.Internal.LazyInternalContext.InitializeDatabaseAction(Action`1 action)
at System.Data.Entity.Internal.LazyInternalContext.InitializeDatabase()
at System.Data.Entity.Internal.InternalContext.Initialize()
at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
at System.Data.Entity.Internal.Linq.InternalSet`1.GetEnumerator()
at System.Data.Entity.Infrastructure.DbQuery`1.System.Collections.Generic.IEnumerable<TResult>.GetEnumerator()
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
at KevinLisaWedding.Controllers.HomeController.Index() in c:\\Users\\kdonde\\Documents\\Visual Studio 2013\\Projects\\KevinLisaWedding\\KevinLisaWedding\\Controllers\\HomeController.cs:line 14
at lambda_method(Closure , ControllerBase , Object[] )
at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)
at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.ActionInvocation.InvokeSynchronousActionMethod()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__36(IAsyncResult asyncResult, ActionInvocation innerInvokeState)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.End()
at System.Web.Mvc.Async.AsyncResultWrapper.End[TResult](IAsyncResult asyncResult, Object tag)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3c()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass45.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3e()

我也搜索了高低，为什么我没有任何运气就收到这个错误，我已经下载了完成的项目并将它与我的项目进行了比较，但没有任何运气。

我目前的代码如下。

在WeddingPreparations项目中...

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namespace WeddingPreparations.Dal
{
public class WeddingContext : DbContext
{
public WeddingContext()
: base("WeddingContext")
{

}

// Any entities reference by this class will be implicitly included.
public DbSet<Invitee> Invitees { get; set; }

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
//base.OnModelCreating(modelBuilder);
}
}
}

和

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namespace WeddingPreparations.Dal
{
public class WeddingInitializer : System.Data.Entity.DropCreateDatabaseIfModelChanges<WeddingContext>
{
protected override void Seed(WeddingContext context)
{
//base.Seed(context);
var invitees = new List<Invitee>
{
new Invitee{ FirstName="FName1", LastName="LName1", Attending = true, HotelRoomRequired= true, Notes="I'm the groom! :)"},
new Invitee{ FirstName="FName2", LastName="LName2", Attending = true, HotelRoomRequired= true, Notes="I'm the bride! :)"}

};
invitees.ForEach(i => context.Invitees.Add(i));
context.SaveChanges();
}
}
}

我在这个项目中的模型如下

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namespace WeddingPreparations.Models
{
public class Invitee
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public bool Attending { get; set; }
public bool HotelRoomRequired { get; set; }
public string Notes { get; set; }
}
}

在 mvc 项目中，我有以下 web.config 文件...

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<?xml version="1.0" encoding="utf-8"?>

<configuration>
<configSections>

<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>

</connectionStrings>

</appSettings>
<system.web>
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
</system.web>
<runtime>

<dependentAssembly>

<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>

<bindingRedirect oldVersion="1.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
</dependentAssembly>
<dependentAssembly>

<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
</dependentAssembly>
<dependentAssembly>

<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>

<bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
</dependentAssembly>
<dependentAssembly>

<bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
</dependentAssembly>
<dependentAssembly>

<bindingRedirect oldVersion="0.0.0.0-3.2.0.0" newVersion="3.2.0.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
<system.webServer>
<handlers>
<remove name="ExtensionlessUrlHandler-Integrated-4.0" />
<remove name="OPTIONSVerbHandler" />
<remove name="TRACEVerbHandler" />

</handlers>
</system.webServer>
<entityFramework>
<contexts>
<context type="WeddingPreparations.Dal.WeddingContext">
<databaseInitializer type="WeddingPreparations.Dal.WeddingInitializer, KevinLisaWedding" />
</context>
</contexts>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="v11.0"/>
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
</configuration>

在我的家庭控制器中，我正在执行以下代码...

1 2	WeddingPreparations.Dal.WeddingContext ctx = new WeddingPreparations.Dal.WeddingContext(); var x = ctx.Invitees.ToList();

如果我没有弄错，它应该创建数据库并使用初始化程序中指定的数据为其播种......但是我得到的只是那个错误，我似乎无法弄清楚...... . 任何方向都值得赞赏。

更新

我尝试像在教程中那样重新创建项目，但我仍然遇到同样的错误。肯定有一些代码丢失了......要么我错过了它......要么教程没有它。