.NET 5.0 published winforms application return System.BadImageFormatException on db access

After updating winforms core 3.1 app with linq2db reference to net5.0 (need the ability to deploy through clickonce) and publishing to folder (without clickonce) and after running that app I see System.BadImageFormatException on any db access. All db queries works when on debug. db: MSSQL linq2db version: 3.1.6 publish target framework: net5.0-windows target runtime: win-x64 and win-x86 - reproduced for both stacktrace:

System.BadImageFormatException: An attempt was made to load a program with an incorrect format. (0x8007000B)
  at System.Data.SqlClient.SNINativeMethodWrapper.UnmanagedIsTokenRestricted(IntPtr token, Boolean& isRestricted)
  at System.Data.Win32NativeMethods.IsTokenRestrictedWrapper(IntPtr token)
  at System.Data.ProviderBase.DbConnectionPoolIdentity.GetCurrentNative()
  at System.Data.ProviderBase.DbConnectionPoolIdentity.GetCurrent()
  at System.Data.ProviderBase.DbConnectionPoolGroup.GetConnectionPool(DbConnectionFactory connectionFactory)
  at System.Data.ProviderBase.DbConnectionFactory.GetConnectionPool(DbConnection owningObject, DbConnectionPoolGroup connectionPoolGroup)
  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.OpenAsync(CancellationToken cancellationToken)
-- End of stack trace from previous location ---
  at LinqToDB.Data.DataConnection.EnsureConnectionAsync(CancellationToken cancellationToken)

Also, when I’ve published that app via clickonce, installing it and trying to start I see the following entry in the Windows Application Event Log after crash:

An assembly specified in the application dependencies manifest (TestApp.deps.json) was not found:
    package: 'runtime.win-x64.runtime.native.System.Data.SqlClient.sni', version: '4.4.0'
    path: 'runtimes/win-x64/native/sni.dll'

[viceroypenguin]

Glad to help how I can! I’m sure we’ll see plenty of these friction bugs over the next couple months. Hopefully they won’t take too long to wash out.

[viceroypenguin]

Download this repo here: https://github.com/viceroypenguin/l2db-publish-net50

If that doesn’t work, then there’s a problem with the build/publish system on your machine; I’d suggest a repair of Visual Studio/reinstall of .net5.0

If that does work, then there’s a dependency management problem. Try restoring packages? Or open the package manager console and execute Update-Package -Reinstall. The first should work, the second forces VS to refresh the dependency chain. Hopefully that will help it to recognize the issues.