using System;

​

public class Program

{

    public static void Main()

    {

        var app = new ApplicationContext();

        var foo = app.Foo;

    }

    class Foo {

        public Foo(Bar bar) {}

    }

    class Bar {

        public Bar(Foo foo) {}

    }

​

    class ApplicationContext

    {

        private Lazy<Foo> _foo;

        private Lazy<Bar> _bar;

        public ApplicationContext()

        {

            _foo = new(() => new Foo(Bar));

            _bar = new(() => new Bar(Foo));

        }

​

        public Foo Foo { get => _foo.Value; }

        public Bar Bar { get => _bar.Value; }

    }

}

​