在 Mono 上使用 SQLite 的 EF Core：e_sqlite3 未找到

Question

我们正在使用 Entity Framework Core 2.2.4 以及面向 .NET Framework 4.7.2 的 SQLite 数据库。安装了以下 Nuget 包：

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

在我的开发机器 (Windows 10) 上一切正常，但是当尝试运行在我们的 32 位 Linux 机器上使用 Mono 应用程序时，出现以下异常：

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，因此在 bin/Debug 中创建了 x86 和 x64 文件夹，它们都包含一个 e_sqlite3.dll。我已经尝试将 x86 dll 复制到 bin/Debug 但错误仍然发生。

到目前为止我尝试过的：

正在安装 Microsoft.EntityFrameworkCore.Sqlite.Core SQLitePCLRaw.bundle_e_sqlite3 按照建议 here
正在安装 Microsoft.EntityFrameworkCore.Sqlite（或 Microsoft.Data.Sqlite 或 SQLitePCLRaw.bundle_green) 按照建议 here
SQLitePCLRaw.* 包的不同组合

我需要做什么才能在 Mono 上获得 EF Core 和 SQlite 运行ning？

Answer 1

度过了一个清爽的周末，又看了一眼问题。我找到了关于 DllNotFoundException 的 official Mono documentation 并使用 MONO_LOG_LEVEL=debug mono YourApp.exe 找出 Mono 试图加载的库。 /usr/lib/libe_sqlite3.so 在我的系统上不可用。我所做的只是复制可用的 /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，但我的应用程序有效。

在 Mono 上使用 SQLite 的 EF Core：e_sqlite3 未找到

EF Core with SQLite on Mono: e_sqlite3 not found

sqlite

mono

entity-framework-core