Windows IoT 树莓派上的 ASP.NET MVC 无法连接到 SQL 数据库

Question

我正在尝试使用带有 .NET Core 2.0.4 的 Windows IoT 系统在 Raspberry Pi 3 上启动 MusicStore 应用程序。

我设法使用 ubuntu 在 Raspberry 上运行它，但在 Windows 中，我收到来自 screenshot 的错误（很抱歉没有复制它，但我在 putty 中没有收到错误，所以我需要使用 Windows IoT 命令行和我无法在任何地方复制此文本）。

两个系统都连接到我的 PC 上的数据库并且 linux 能够运行应用程序，而 Windows 出现故障，所以这不是连接字符串的错误。 我之前遇到过缺少 sni.dll 的问题，但按照this thread 中的建议，我通过复制 unix 修复了它。

有什么想法吗？

编辑： 今天我在我的旧电脑（win10-x64）上测试了它，我得到了与 Windows-IoT 相同的错误，所以我可以在这里复制它。

Unhandled Exception: System.AggregateException: One or more errors occurred. (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: 44 - Could not compose Service Principal Name (SPN) for Windows Integrated Authentication. Possible causes are server(s) incorrectly specified to connection API calls, Domain Name System (DNS) lookup failure or memory shortage)) ---> System.Data.SqlClient.SqlException: 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: 44 - Could not compose Service Principal Name (SPN) for Windows Integrated Authentication. Possible causes are server(s) incorrectly specified to connection API calls, Domain Name System (DNS) lookup failure or memory shortage) ---> System.Net.Sockets.SocketException: Nieznany host
    at System.Net.Dns.InternalGetHostByAddress(IPAddress address)
    at System.Net.Dns.GetHostEntry(String hostNameOrAddress)
    at System.Data.SqlClient.SNI.SNIProxy.GetSqlServerSPN(String hostNameOrAddress, String portOrInstanceName)
    at System.Data.SqlClient.SNI.SNIProxy.GetSqlServerSPN(DataSource dataSource)
    at System.Data.SqlClient.SNI.SNIProxy.CreateConnectionHandle(Object callbackObject, String fullServerName, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Byte[]& instanceName, Byte[]& spnBuffer, Boolean flushCache, Boolean async, Boolean parallel, Boolean isIntegratedSecurity)
--- End of inner exception stack trace ---
    at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, Boolean applyTransientFaultHandling)
    at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
    at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)
    at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
    at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)
    at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
    at System.Data.ProviderBase.DbConnectionPool.WaitForPendingOpen()
--- End of stack trace from previous location where exception was thrown ---
    at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.OpenAsync(CancellationToken cancellationToken, Boolean errorsExpected)
    at Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerDatabaseCreator.<>c__DisplayClass20_0.<<ExistsAsync>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
    at Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerDatabaseCreator.<>c__DisplayClass20_0.<<ExistsAsync>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
    at Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerExecutionStrategy.ExecuteAsync[TState,TResult](TState state, Func`4 operation, Func`4 verifySucceeded, CancellationToken cancellationToken)
    at Microsoft.EntityFrameworkCore.Storage.RelationalDatabaseCreator.EnsureCreatedAsync(CancellationToken cancellationToken)
    at MusicStore.Models.SampleData.InitializeMusicStoreDatabaseAsync(IServiceProvider serviceProvider, Boolean createUsers) in C:\Users\lukas\Documents\projekty\magister\MusicStore\Models\SampleData.cs:line 27
--- End of inner exception stack trace ---
    at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
    at System.Threading.Tasks.Task.Wait()
    at MusicStore.Startup.Configure(IApplicationBuilder app) in C:\Users\lukas\Documents\projekty\magister\MusicStore\Startup.cs:line 220
    at MusicStore.Startup.ConfigureProduction(IApplicationBuilder app) in C:\Users\lukas\Documents\projekty\magister\MusicStore\Startup.cs:line 171
--- End of stack trace from previous location where exception was thrown ---
    at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.Configure(IApplicationBuilder app)
    at Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()
    at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
    at MusicStore.Program.Main(String[] args) in C:\Users\lukas\Documents\projekty\magister\MusicStore\Program.cs:line 67

Answer 1

据我所知，arm 上的 Windows IoT Core 无法连接到 MS SQL Server。您可以在 GitHub 上跟踪问题（#9064）。 您可以使用其他 Web 服务或 wcf 并通过 REST-API 进行通信以解决问题。