ModuleInitializer.cs

using System;
using System.IO;
using System.Reflection;
using System.Runtime.CompilerServices;

namespace System.Runtime.CompilerServices
{
    [AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
    public sealed class ModuleInitializerAttribute : Attribute { }
}

static class ModuleInitializer
{
    [ModuleInitializer]
    internal static void Run()
    {
        AppDomain.CurrentDomain.AssemblyResolve += OnAssemblyResolve;

        var binPath = ThisAssembly.Project.MSBuildBinPath;
        Microsoft.Build.Locator.MSBuildLocator.RegisterMSBuildPath(binPath);
        // Set environment variables so SDKs can be resolved. 
        Environment.SetEnvironmentVariable("MSBUILD_EXE_PATH", Path.Combine(binPath, "MSBuild.exe"), EnvironmentVariableTarget.Process);
    }

    static Assembly? OnAssemblyResolve(object sender, ResolveEventArgs args)
    {
        var name = new AssemblyName(args.Name).Name;
        var file = Path.Combine(ThisAssembly.Project.MSBuildBinPath, name + ".dll");

        if (name.StartsWith("Microsoft.Build") && File.Exists(file))
            return Assembly.LoadFrom(file);

        return null;
    }
}