我正在尝试将appicationDBContext从asp.net MVC5 Web应用程序项目移到自己的程序集中。我尝试为数据访问层创建一个类库，并使用nuget来安装aspnet.identity程序集。
我无法让这个工作。我尝试过几个不同的例子，但不确定最好的方法是什么。
我在codeplex中创建了一个基本示例： https://testdal.codeplex.com/
这是一个空的mvc5网站，引用了类库DAL。在DAL中是来自默认样本网站的模型以及参考和一些基本测试代码，以尝试注册用户。
我收到以下错误：
Instance failure.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.InvalidOperationException: Instance failure.
Source Error:
Line 18:
Line 19: var user = new ApplicationUser() { UserName = "paul" };
Line 20: var result = UserManager.Create(user, "123456");
Line 21:
Line 22:
Source File: c:\Users\paul\Documents\Visual Studio 2013\Projects\emptyWebsite\DAL\Register.cs Line: 20
Stack Trace:
[InvalidOperationException: Instance failure.]
System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection) +414
System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +78
System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) +196
System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +146
System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +16
System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry) +94
System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +110
System.Data.SqlClient.SqlConnection.Open() +96
System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.<open>
b__36(DbConnection t, DbConnectionInterceptionContext c) +36
System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch(TTarget target, Action`2 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed) +138
System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.Open(DbConnection connection, DbInterceptionContext interceptionContext) +477
System.Data.Entity.SqlServer.<>c__DisplayClass34.<usingconnection>
b__32() +344
System.Data.Entity.SqlServer.<>c__DisplayClass1.<execute>
b__0() +34
System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Func`1 operation) +251
System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Action operation) +196
System.Data.Entity.SqlServer.SqlProviderServices.UsingConnection(DbConnection sqlConnection, Action`1 act) +420
System.Data.Entity.SqlServer.SqlProviderServices.UsingMasterConnection(DbConnection sqlConnection, Action`1 act) +335
System.Data.Entity.SqlServer.SqlProviderServices.CreateDatabaseFromScript(Nullable`1 commandTimeout, DbConnection sqlConnection, String createDatabaseScript) +151
System.Data.Entity.SqlServer.SqlProviderServices.DbCreateDatabase(DbConnection connection, Nullable`1 commandTimeout, StoreItemCollection storeItemCollection) +287
System.Data.Entity.Core.Common.DbProviderServices.CreateDatabase(DbConnection connection, Nullable`1 commandTimeout, StoreItemCollection storeItemCollection) +110
System.Data.Entity.Core.Objects.ObjectContext.CreateDatabase() +236
System.Data.Entity.Migrations.Utilities.DatabaseCreator.Create(DbConnection connection) +143
System.Data.Entity.Migrations.DbMigrator.EnsureDatabaseExists(Action mustSucceedToKeepDatabase) +207
System.Data.Entity.Migrations.Infrastructure.MigratorBase.EnsureDatabaseExists(Action mustSucceedToKeepDatabase) +42
System.Data.Entity.Migrations.DbMigrator.Update(String targetMigration) +136
System.Data.Entity.Migrations.Infrastructure.MigratorBase.Update() +33
System.Data.Entity.Internal.DatabaseCreator.CreateDatabase(InternalContext internalContext, Func`3 createMigrator, ObjectContext objectContext) +175
System.Data.Entity.Internal.InternalContext.CreateDatabase(ObjectContext objectContext, DatabaseExistenceState existenceState) +150
System.Data.Entity.Database.Create(DatabaseExistenceState existenceState) +444
System.Data.Entity.CreateDatabaseIfNotExists`1.InitializeDatabase(TContext context) +288
System.Data.Entity.Internal.<>c__DisplayClassf`1.<createinitializationaction>
b__e() +165
System.Data.Entity.Internal.InternalContext.PerformInitializationAction(Action action) +110
System.Data.Entity.Internal.InternalContext.PerformDatabaseInitialization() +660
System.Data.Entity.Internal.LazyInternalContext.<initializedatabase>
b__4(InternalContext c) +31
System.Data.Entity.Internal.RetryAction`1.PerformAction(TInput input) +143
System.Data.Entity.Internal.LazyInternalContext.InitializeDatabaseAction(Action`1 action) +292
System.Data.Entity.Internal.LazyInternalContext.InitializeDatabase() +123
System.Data.Entity.Internal.InternalContext.Initialize() +42
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.Include(String path) +41
System.Data.Entity.Infrastructure.DbQuery`1.Include(String path) +142
System.Data.Entity.QueryableExtensions.Include(IQueryable`1 source, String path) +205
System.Data.Entity.QueryableExtensions.Include(IQueryable`1 source, Expression`1 path) +305
Microsoft.AspNet.Identity.EntityFramework.UserStore`6.GetUserAggregateAsync(Expression`1 filter) +610
Microsoft.AspNet.Identity.EntityFramework.UserStore`6.FindByNameAsync(String userName) +1069
Microsoft.AspNet.Identity.UserManager`2.FindByNameAsync(String userName) +177
Microsoft.AspNet.Identity.<validateusername>
d__4.MoveNext() +803
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52
System.Runtime.CompilerServices.TaskAwaiter.GetResult() +21
Microsoft.AspNet.Identity.<validateasync>
d__0.MoveNext() +468
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52
System.Runtime.CompilerServices.ConfiguredTaskAwaiter.GetResult() +24
Microsoft.AspNet.Identity.<createasync>
d__0.MoveNext() +846
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52
System.Runtime.CompilerServices.ConfiguredTaskAwaiter.GetResult() +24
Microsoft.AspNet.Identity.<createasync>
d__d.MoveNext() +1113
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52
System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() +24
Microsoft.AspNet.Identity.AsyncHelper.RunSync(Func`1 func) +228
Microsoft.AspNet.Identity.UserManagerExtensions.Create(UserManager`2 manager, TUser user, String password) +260
DAL.Register.register() in c:\Users\paul\Documents\Visual Studio 2013\Projects\emptyWebsite\DAL\Register.cs:20
emptyWebsite.Controllers.HomeController.Index() in c:\Users\paul\Documents\Visual Studio 2013\Projects\emptyWebsite\emptyWebsite\Controllers\HomeController.cs:20
lambda_method(Closure , ControllerBase , Object[] ) +101
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +59
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +435
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +60
System.Web.Mvc.Async.ActionInvocation.InvokeSynchronousActionMethod() +76
System.Web.Mvc.Async.AsyncControllerActionInvoker.<begininvokesynchronousactionmethod>
b__36(IAsyncResult asyncResult, ActionInvocation innerInvokeState) +36
System.Web.Mvc.Async.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult) +73
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +136
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +102
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +49
System.Web.Mvc.Async.AsyncInvocationWithFilters.<invokeactionmethodfilterasynchronouslyrecursive>
b__3c() +117
System.Web.Mvc.Async.<>c__DisplayClass45.<invokeactionmethodfilterasynchronouslyrecursive>
b__3e() +323
System.Web.Mvc.Async.<>c__DisplayClass30.<begininvokeactionmethodwithfilters>
b__2f(IAsyncResult asyncResult) +44
System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +47
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +136
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +102
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +50
System.Web.Mvc.Async.<>c__DisplayClass28.<begininvokeaction>
b__19() +72
System.Web.Mvc.Async.<>c__DisplayClass1e.<begininvokeaction>
b__1b(IAsyncResult asyncResult) +185
System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +42
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +133
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +56
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +40
System.Web.Mvc.Controller.<beginexecutecore>
b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +34
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +70
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +139
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.EndExecuteCore(IAsyncResult asyncResult) +44
System.Web.Mvc.Controller.<beginexecute>
b__15(IAsyncResult asyncResult, Controller controller) +39
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +62
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +139
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.MvcHandler.<beginprocessrequest>
b__4(IAsyncResult asyncResult, ProcessRequestState innerState) +39
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +70
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +139
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.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +40
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +38
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9514928
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
有人可以帮我找到一种从UI项目中分离模型的简单方法吗？
由于
保
答案 0 :(得分：0)
尝试以下后我设法解决了这个问题：
Moving ASP.NET Identity model to class library http://www.umbraworks.net/bl0g/rebuildall/2013/10/22/Moving_ASP_NET_Identity_model_into_another_assembly
我最初尝试了这个并尝试了许多类似的方法，虽然我发现从新鲜开始，删除数据库并指定特定的数据库位置帮助。我后来认为可能启用数据迁移可以解决问题。这仍然取决于web.config中的连接字符串，因此不会完全解耦，但现在似乎正在工作
感谢