【发布时间】：2014-07-02 23:20:31
【问题描述】：
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 = {"设置数据库失败 'WeddingPreparations.Dal.WeddingInitializer 类型的初始化程序， KevinLisaWedding' 用于 DbContext 类型 'WeddingPreparations.Dal.WeddingContext' 在应用程序中指定 配置。有关详细信息，请参阅内部异常。"}
内部异常是...
{"无法从 程序集 'EntityFramework，版本 = 6.0.0.0，文化 = 中性， PublicKeyToken=b77a5c561934e089'.":"WeddingPreparations.Dal.WeddingContext"}
堆栈跟踪是...
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()
我还搜索了高低，以了解为什么我没有任何运气就收到此错误，并且我已经下载了完成的项目并将其与我的项目进行了比较，但没有任何运气。
我当前的代码如下。
在WeddingPreparations项目中……
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
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
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...
<?xml version="1.0" encoding="utf-8"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=301880
-->
<configuration>
<configSections>
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 --></configSections>
<connectionStrings>
<add name="WeddingContext" connectionString="Data Source=(LocalDb)\v11.0;Initial Catalog=WeddingInvites;Integrated Security=SSPI;" providerName="System.Data.SqlClient" />
</connectionStrings>
<appSettings>
<add key="webpages:Version" value="3.0.0.0" />
<add key="webpages:Enabled" value="false" />
<add key="ClientValidationEnabled" value="true" />
<add key="UnobtrusiveJavaScriptEnabled" value="true" />
</appSettings>
<system.web>
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
</system.web>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Ninject" publicKeyToken="c7192dc5380945e7" culture="neutral" />
<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" />
<add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
</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......
WeddingPreparations.Dal.WeddingContext ctx = new WeddingPreparations.Dal.WeddingContext();
var x = ctx.Invitees.ToList();
如果我没记错的话，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......任何方向表示赞赏。
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。
【问题讨论】：
-
正在创建的程序集的名称是什么？是WeddingPreparations 还是KevinLisaWedding？
-
KevinLisaWedding 是网站项目，WeddingPreparations 是带有实体模型和实体框架上下文等的 dll。
-
如果你在
DbContext构造函数中设置初始化器是否有效，像这样：Database.SetInitializer(new WeddingInitializer()); -
谢谢 david004 我已经按照您的建议进行了尝试，但最终还是出现了同样的错误。我不确定是否可以提供更多信息。
标签： c# asp.net-mvc entity-framework entity-framework-6 entity-framework-migrations