Question

我们正在使用Entity Framework Core 2.2.4和针对.NET Framework 4.7.2的SQLite数据库。已安装以下Nuget软件包：

Microsoft.Data.Sqlite
Microsoft.EntityFrameworkCore.Sqlite
Microsoft.EntityFrameworkCore.Tools

在我的开发计算机（Windows 10）上，一切正常，但是当尝试在我们的32位Linux计算机上使用Mono运行应用程序时，会发生以下异常：

FATAL UNHANDLED EXCEPTION: System.TypeInitializationException: The type 
initializer for 'Microsoft.Data.Sqlite.SqliteConnection' threw an exception. 
---> System.Reflection.TargetInvocationException: Exception has been thrown 
by the target of an invocation. ---> System.DllNotFoundException: e_sqlite3
at (wrapper managed-to-native) 
SQLitePCL.SQLite3Provider_e_sqlite3+NativeMethods.sqlite3_libversion_number()
  at SQLitePCL.SQLite3Provider_e_sqlite3.SQLitePCL.ISQLite3Provider.sqlite3_libversion_number () [0x00000] in <61bb3ca1db9c41ea88f280f0b1600d58>:0
  at SQLitePCL.raw.SetProvider (SQLitePCL.ISQLite3Provider imp) [0x00008] in <3d4b21fb9c764efbb11f6e3b02efff52>:0
  at SQLitePCL.Batteries_V2.Init () [0x00005] in <f5d9c86a14864b5d99b8bdece1b8292c>:0
  at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke(System.Reflection.MonoMethod,object,object[],System.Exception&)
  at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00032] in <a89b9d7c1a66468eb33312af7ed3a74e>:0
   --- End of inner exception stack trace ---
  at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00048] in <a89b9d7c1a66468eb33312af7ed3a74e>:0
  at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in <a89b9d7c1a66468eb33312af7ed3a74e>:0
  at Microsoft.Data.Sqlite.Utilities.BundleInitializer.Initialize () [0x0002f] in <b46e232ade014524baa458345f270c50>:0
  at Microsoft.Data.Sqlite.SqliteConnection..cctor () [0x00000] in <b46e232ade014524baa458345f270c50>:0
   --- End of inner exception stack trace ---
  at (wrapper managed-to-native) System.Object.__icall_wrapper_mono_generic_class_init(intptr)
  at Microsoft.EntityFrameworkCore.Sqlite.Storage.Internal.SqliteRelationalConnection.CreateDbConnection () [0x00006] in <74192050a4d342039620dc7ef6678f71>:0
  at Microsoft.EntityFrameworkCore.Internal.LazyRef`1[T].get_Value () [0x00008] in <adf771f92e754fe1bb85c5850cd0c16b>:0
  at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.get_DbConnection () [0x00000] in <69f795dffc844780bfcfff4ff8415a92>:0
  at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.Open (System.Boolean errorsExpected) [0x00000] in <69f795dffc844780bfcfff4ff8415a92>:0
  at Microsoft.EntityFrameworkCore.Sqlite.Storage.Internal.SqliteRelationalConnection.Open (System.Boolean errorsExpected) [0x00000] in <74192050a4d342039620dc7ef6678f71>:0
  at Microsoft.EntityFrameworkCore.Sqlite.Storage.Internal.SqliteDatabaseCreator.Exists () [0x0000c] in <74192050a4d342039620dc7ef6678f71>:0
  at Microsoft.EntityFrameworkCore.Migrations.HistoryRepository.Exists () [0x0000b] in <69f795dffc844780bfcfff4ff8415a92>:0
  at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate (System.String targetMigration) [0x00012] in <69f795dffc844780bfcfff4ff8415a92>:0
  at Microsoft.EntityFrameworkCore.RelationalDatabaseFacadeExtensions.Migrate (Microsoft.EntityFrameworkCore.Infrastructure.DatabaseFacade databaseFacade) [0x00010] in <69f795dffc844780bfcfff4ff8415a92>:0
  at TestEfCorePlusSqlite.Program.Main (System.String[] args) [0x0000e] in <c4fad569c9a241ef887b5b2ddbc0225f>:0

由于应用程序是使用任何CPU配置构建的，因此x86和x64文件夹是在bin / Debug中创建的，都包含e_sqlite3.dll。我已经尝试将x86 dll复制到bin / Debug，但是仍然出现错误。

到目前为止，我已经尝试过：

同时安装Microsoft.EntityFrameworkCore.Sqlite.Core和 SQLitePCLRaw.bundle_e_sqlite3，如建议的here
安装Microsoft.EntityFrameworkCore.Sqlite（或 Microsoft.Data.Sqlite或SQLitePCLRaw.bundle_green），如建议的here
SQLitePCLRaw.*个软件包的不同组合

要使EF Core和SQlite在Mono上运行我该怎么办？

Answer 1

经过一个令人耳目一新的周末后，我又看了一眼这个问题。我找到了与DllNotFoundException有关的official Mono documentation，并使用MONO_LOG_LEVEL=debug mono YourApp.exe找出了要加载的lib Mono。 /usr/lib/libe_sqlite3.so在我的系统上不可用。我所做的就是复制可用的/usr/lib/libsqlite3.so并将其重命名为libe_sqlite3.so。我不确定这是否是首选方式，但是我的应用程序可以正常工作。

具有Mono上的SQLite的EF Core：找不到e_sqlite3

1 个答案: