Visibility of nested class constructor

Question

Is there a way to limit the instantiation of the nested class in C#? I want to prevent nested class being instantiated from any other class except the nesting class, but to allo

Answer 1

public class Outer
{
    public class Nested
    {
        readonly Outer Outer;

        public Nested(Outer outer /* , parameters */)
        {
            Outer = outer;

            // implementation
        }

        // implementation
    }

    public Nested GetNested(/* parameters */) => new Nested(this /* , parameters */);
}

Note that you can access private members of Outer from Nested.