blocks|key|5933748|text|堆栈跟踪指示您需要安装并启用本地数据库运行时特性|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5933749|Unable+to+locate+a+Local+Database+Runtime+installation.+Verify+that+SQL+Server+Express+is+properly+installed+and+that+the+Local+Database+Runtime+feature+is+enabled|code-block|syntax|javascript|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|I|8|@]|9|@]|A|$E|F]]]|G|$]]

The stack trace indicates that you need to install SQL Server Express and enable the Local Database Runtime feature

<pre><code>Unable to locate a Local Database Runtime installation. Verify that SQL Server Express is properly installed and that the Local Database Runtime feature is enabled
</code></pre>

blocks|key|61235|text|我已经解决了我的问题。结果表明，ApplicationDbContext连接字符串没有在发布设置配置上设置。我有另一个dbcontext，它是应用程序使用的主要上下文，并且已经设置好了。这就是为什么应用程序一开始运行良好的原因。会话超时进程中一定有调用ApplicationDbContext的东西，这导致了我正在经历的异常。有人能解释一下那可能是什么吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

I have solved my problem. It turns out that the ApplicationDbContext connection string was not set on the Publish settings configuration. I had another dbcontext that was the main one used by the application and it was set. This is why the application work fine at first. There must be something in the Session Time out process that calls into the ApplicationDbContext which caused the exception I was experiencing. Can someone explain what that could be?

My site will run fine and I can go through the entire site, but after my session times out, when I make another request to a page I get this exception:

Server Error in '/' Application.
The system cannot find the file specified
Description: An un-handled 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.ComponentModel.Win32Exception: The system cannot find the file specified

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[Win32Exception (0x80004005): The system cannot find the file specified]

[SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 52 - Unable to locate a Local Database Runtime installation. Verify that SQL Server Express is properly installed and that the Local Database Runtime feature is enabled.)]
 System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, DbConnectionPool pool, String accessToken, Boolean applyTransientFaultHandling, SqlAuthenticationProviderManager sqlAuthProviderManager) +907
 System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions) +334
 System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions) +38
 System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) +699
 System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) +89
 System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal&amp; connection) +426
 System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource<code>1 retry, DbConnectionOptions userOptions, DbConnectionInternal&amp; connection) +78
 System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource</code>1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal&amp; connection) +191
 System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource<code>1 retry, DbConnectionOptions userOptions) +154
 System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource</code>1 retry, DbConnectionOptions userOptions) +21
 System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource<code>1 retry) +90
 System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource</code>1 retry) +443
 System.Data.SqlClient.SqlConnection.Open() +96
 System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.b__36(DbConnection t, DbConnectionInterceptionContext c) +10
 System.Data.Entity.Infrastructure.Interception.InternalDispatcher<code>1.Dispatch(TTarget target, Action</code>2 operation, TInterceptionContext interceptionContext, Action<code>3 executing, Action</code>3 executed) +72
 System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.Open(DbConnection connection, DbInterceptionContext interceptionContext) +359
 System.Data.Entity.SqlServer.&lt;>c__DisplayClass33.b__32() +426
 System.Data.Entity.SqlServer.&lt;>c__DisplayClass1.b__0() +10
 System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Func<code>1 operation) +189
 System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Action operation) +77
 System.Data.Entity.SqlServer.SqlProviderServices.UsingConnection(DbConnection sqlConnection, Action</code>1 act) +174
 System.Data.Entity.SqlServer.SqlProviderServices.UsingMasterConnection(DbConnection sqlConnection, Action<code>1 act) +552
 System.Data.Entity.SqlServer.SqlProviderServices.CreateDatabaseFromScript(Nullable</code>1 commandTimeout, DbConnection sqlConnection, String createDatabaseScript) +90
 System.Data.Entity.SqlServer.SqlProviderServices.DbCreateDatabase(DbConnection connection, Nullable<code>1 commandTimeout, StoreItemCollection storeItemCollection) +171
 System.Data.Entity.Core.Common.DbProviderServices.CreateDatabase(DbConnection connection, Nullable</code>1 commandTimeout, StoreItemCollection storeItemCollection) +76
 System.Data.Entity.Core.Objects.ObjectContext.CreateDatabase() +134
 System.Data.Entity.Migrations.Utilities.DatabaseCreator.Create(DbConnection connection) +119
 System.Data.Entity.Migrations.DbMigrator.EnsureDatabaseExists(Action mustSucceedToKeepDatabase) +142
 System.Data.Entity.Migrations.DbMigrator.Update(String targetMigration) +78
 System.Data.Entity.Internal.DatabaseCreator.CreateDatabase(InternalContext internalContext, Func<code>3 createMigrator, ObjectContext objectContext) +89
 System.Data.Entity.Internal.InternalContext.CreateDatabase(ObjectContext objectContext, DatabaseExistenceState existenceState) +116
 System.Data.Entity.Database.Create(DatabaseExistenceState existenceState) +218
 System.Data.Entity.CreateDatabaseIfNotExists</code>1.InitializeDatabase(TContext context) +151
 System.Data.Entity.Internal.&lt;>c__DisplayClassf<code>1.&lt;CreateInitializationAction&gt;b__e() +76
 System.Data.Entity.Internal.InternalContext.PerformInitializationAction(Action action) +60
 System.Data.Entity.Internal.InternalContext.PerformDatabaseInitialization() +357
 System.Data.Entity.Internal.LazyInternalContext.&lt;InitializeDatabase&gt;b__4(InternalContext c) +7
 System.Data.Entity.Internal.RetryAction</code>1.PerformAction(TInput input) +110
 System.Data.Entity.Internal.LazyInternalContext.InitializeDatabaseAction(Action<code>1 action) +198
 System.Data.Entity.Internal.LazyInternalContext.InitializeDatabase() +91
 System.Data.Entity.Internal.InternalContext.Initialize() +30
 System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) +16
 System.Data.Entity.Internal.Linq.InternalSet</code>1.Initialize() +53
 System.Data.Entity.Internal.Linq.InternalSet<code>1.get_InternalContext() +15
 System.Data.Entity.Internal.Linq.InternalSet</code>1.FindAsync(CancellationToken cancellationToken, Object[] keyValues) +53
 System.Data.Entity.DbSet<code>1.FindAsync(CancellationToken cancellationToken, Object[] keyValues) +33
 System.Data.Entity.DbSet</code>1.FindAsync(Object[] keyValues) +26
 Microsoft.AspNet.Identity.EntityFramework.EntityStore<code>1.GetByIdAsync(Object id) +49
 Microsoft.AspNet.Identity.EntityFramework.&lt;GetUserAggregateAsync&gt;d__6c.MoveNext() +166
 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
 Microsoft.AspNet.Identity.CultureAwaiter</code>1.GetResult() +59
 Microsoft.AspNet.Identity.Owin.&lt;b__1>d__4.MoveNext() +904
 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
 System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task) +25
 Microsoft.Owin.Security.Cookies.d__2.MoveNext() +2200
 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
 Microsoft.Owin.Security.Infrastructure.d__0.MoveNext() +571
 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
 Microsoft.Owin.Security.Infrastructure.d__0.MoveNext() +255
 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
 Microsoft.AspNet.Identity.Owin.d__0.MoveNext() +404
 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
 Microsoft.AspNet.Identity.Owin.d__0.MoveNext() +404
 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
 Microsoft.AspNet.Identity.Owin.d__0.MoveNext() +404
 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
 Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.d__5.MoveNext() +182
 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
 Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.d__2.MoveNext() +180
 Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.StageAsyncResult.End(IAsyncResult ar) +69
 Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContext.EndFinalWork(IAsyncResult ar) +64
 System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +380
 System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +48
 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +159

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3535.0

<hr>

At this point the site will not function until I delete my application cookie. I will continue to get the network exception on all page requests. i don't understand how i could be connecting just fine to my database then all of a sudden stop being able to connect to it. Its like a connection to the database went stale and is not able to re-establish.

Any help would be much appreciated.

Thanks

Network Exception thrown after session timeout

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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