Problem when creating instance out of default AssemblyLoadContext

[jantoas]

Hello,

log4net logger shall be loaded in a plugin which is implemented in .net6.0.

Each plugin has it's own AssemblyLoadContex.

When try to instantiate, following error occurs:

log4net:ERROR [AdoNetAppender] ErrorCode: GenericFailure. Failed to load connection type [System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089] System.IO.FileNotFoundException: Could not load file or assembly 'System.Data.SqlClient, Version=0.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. Das System kann die angegebene Datei nicht finden.

But file System.Data.SqlClient is in plugin folder, which is not application folder of executable.

Any idea to fix this issue?

[microknights]

Hi @jantoas

Without knowing your plugin setup, maybe one way would be to do custom AssemblyResolve?

AppDomain.CurrentDomain.AssemblyResolve += (sender, args) =>
{
    string fileName = new AssemblyName(args.Name).Name + ".dll";
    string assemblyPath = Path.Combine("plugin/***", fileName);
    var assembly = Assembly.LoadFile(assemblyPath);
    return assembly;
};

or maybe this can give you some hints:

https://jeremybytes.blogspot.com/2020/01/dynamically-loading-types-in-net-core.html