Example of self embedded assembly extraction

AssemblyTest.cs

using System.Reflection;
using System.Runtime.Loader;

namespace AssemblyTest
{
    internal class AssemblyTest
    {
        static AssemblyTest()
        {
            SetOurResolveHandlerAtFront();
        }

        private static Assembly AssemblyResolveEventListener(object sender, ResolveEventArgs args)
        {
            if (args is null) return null!;
            string dllName = args.Name[..args.Name.IndexOf(',')];
            foreach (var field in typeof(AssemblyTest.Properties.Resources).GetProperties(BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic))
            {
                if (field.Name == dllName.Replace('.', '_'))
                {
                    return Assembly.Load((byte[])field.GetValue(null)!);
                }
            }
            return null!;
        }
        private static void SetOurResolveHandlerAtFront()
        {
            BindingFlags flags = BindingFlags.Static | BindingFlags.NonPublic;
            FieldInfo? field = null;

            Type domainType = typeof(AssemblyLoadContext);

            while (field is null)
            {
                if (domainType is not null)
                {
                    field = domainType.GetField("AssemblyResolve", flags);
                }
                else
                {
                    return;
                }
                if (field is null)
                    domainType = domainType.BaseType!;
            }

            MulticastDelegate resolveDelegate = (MulticastDelegate)field.GetValue(null)!;
            Delegate[] subscribers = resolveDelegate.GetInvocationList();

            Delegate currentDelegate = resolveDelegate;
            for (int i = 0; i < subscribers.Length; i++)
                currentDelegate = Delegate.RemoveAll(currentDelegate, subscribers[i])!;

            Delegate[] newSubscriptions = new Delegate[subscribers.Length + 1];
            newSubscriptions[0] = (ResolveEventHandler)AssemblyResolveEventListener!;
            Array.Copy(subscribers, 0, newSubscriptions, 1, subscribers.Length);

            currentDelegate = Delegate.Combine(newSubscriptions)!;

            field.SetValue(null, currentDelegate);
        }
    }
}

Just add all DLLs you want to load internally into your normal Resource.resx file.

this method can also be used to use specific assembly versions dynamically as we run before all other assembly resolvers