Unable to load e_sqlite3.dll for Microsoft.EntityFrameworkCore.Sqlite 3.0.0

Describe the bug DllNotFoundException thrown when using a plugin that consumes Microsoft.EntityFrameworkCore.Sqlite 3.0.0 . If I downgrade EFCore.Sqlite to 2.2.6, the plugin works fine.

System.TypeInitializationException: 'The type initializer for 'Microsoft.Data.Sqlite.SqliteConnection' threw an exception.'
DllNotFoundException: Unable to load DLL 'e_sqlite3' or one of its dependencies: The specified module could not be found. (0x8007007E)

To Reproduce Steps to reproduce the behavior: Version: 0.3.1 Code (In the main program):

public Assembly Load(string assemblyName)
{
    return PluginLoader.CreateFromAssemblyFile(assemblyName).LoadDefaultAssembly();
}

The plugin connects to a Sqlite3 database with Microsoft.EntityFrameworkCore.Sqlite 3.0.0 and print data to Console. (See the screenshot for details)

Expected behavior The plugin should not throw DllNotFoundException.

Screenshots

Additional context

If I copy “e_sqlite3.dll” from “plugins\runtimes\win-x64\native\e_sqlite3.dll” to the “plugins” directory, the plugin won’t throw DllNotFoundException.

[natemcmaster]

Sorry, but I don’t think there is anything I can do to fix this error. Under the hood, EF Core’s SQLite provider uses https://github.com/ericsink/SQLitePCL.raw. The way SQLitePCLRaw.nativelibrary is attempting to load the “e_sqlite3.dll” library circumvents this essential callback in System.Runtime.Loader.AssemblyLoadContext.

The root cause appears to be the use of System.Runtime.InteropServices.NativeLibrary. This doesn’t account for the current AssemblyLoadContext or the runtimes/$rid/native/*.dll layout. System.Runtime.Loader.AssemblyDependencyResolver might be a better library for SQLitePCLRaw to use, but I’ll leave that up to @ericsink.

Workaround

Change your plugin deployment to include a runtime identifier. dotnet publish --runtime win-x64 should do the trick.

[ravigupta0510]

Hi guys,

I was also facing the same issue. I found the solution and it’s working perfectly for me. If you ask I can write a detail note on the solution.