实体框架Core使用RPI 3（控制台应用程序）

Question

我成功地部署了.NET的核心控制台应用程序以我的Windows物联网在树莓派3

应用程序运行在Windows上运行物联网从Web服务中提取数据，并将它们存储在数据库中。我为此使用了Entity Framework Core。

当我通过远程PowerShell启动部署的控制台应用程序（.exe）时，除了访问我在Azure上运行的数据库以外，其他所有工作都可以使用。当应用程序试图从数据库中读取它抛出以下异常：

System.TypeInitializationException: The type initializer for 'System.Data.SqlClient.TdsParser' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.Data.SqlClient.SNILoadHandle' threw an exception. ---> System.DllNotFoundException: Unable to load DLL 'sni.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E) 
    at System.Data.SqlClient.SNINativeMethodWrapper.SNIInitialize(IntPtr pmo) 
    at System.Data.SqlClient.SNILoadHandle..ctor() 
    at System.Data.SqlClient.SNILoadHandle..cctor() 
    --- End of inner exception stack trace --- 
    at System.Data.SqlClient.TdsParser..cctor() 
    --- End of inner exception stack trace --- 
    at System.Data.SqlClient.TdsParser..ctor(Boolean MARS, Boolean fAsynchronous) 
    at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, TimeoutTimer timeout) 
    at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, Boolean redirectedUserInstance) 
    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.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) 
    at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) 
    at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) 
    at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) 
    at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) 
    at System.Data.SqlClient.SqlConnection.Open() 
    at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.Open() 
    at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable.Enumerator.BufferlessMoveNext(Boolean buffer) 
    at Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerExecutionStrategy.Execute[TState,TResult](Func`2 operation, Func`2 verifySucceeded, TState state) 
    at Microsoft.EntityFrameworkCore.ExecutionStrategyExtensions.Execute[TState,TResult](IExecutionStrategy strategy, Func`2 operation, TState state) 
    at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable.Enumerator.MoveNext() 
    at Microsoft.EntityFrameworkCore.Query.QueryMethodProvider.<_ShapedQuery>d__3`1.MoveNext() 
    at System.Linq.Enumerable.TryGetFirst[TSource](IEnumerable`1 source, Boolean& found) 
    at System.Linq.Enumerable.First[TSource](IEnumerable`1 source) 
    at lambda_method(Closure , QueryContext) 
    at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.<>c__DisplayClass20_0`1.<CompileQueryCore>b__0(QueryContext qc) 
    at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.Execute[TResult](Expression query) 
    at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.Execute[TResult](Expression expression) 
    at System.Linq.Queryable.First[TSource](IQueryable`1 source) 

有一个在应用程序文件夹中没有“sni.dll”。

使用'win8-arm'运行时部署应用程序。

• netcoreapp2.0
• .NET核2.0 SDK（运行时和工具）

任何想法有什么不对？

更新：

复制System.Data.SqlClient.dll（UNIX LIB）和重写应用程序文件夹中存在的一个问题得到了解决。见下面的答案。

Answer 1

ARM没有本地sni.dll库。 （见dotnet/corefx#9064）

我希望我能告诉你如何使用的System.Data.SqlClient（这是在Linux上使用的）完全管理的实施，但不幸的是使用System.Threading.Thread这不适用于UWP ...

[Update1]
等一下，你没有使用UWP。 :)尝试让应用程序在运行时使用%USERPROFILE%.nuget\packages\system.data.sqlclient\4.3.0\runtimes\unix\lib\netstandard1.3\System.Data.SqlClient.dll。

[Update2]
它看起来像在System.Data.SqlClient版本4.4.0中，默认情况下它将被完全管理。