using System;

public class Program

{

    public void Main()

    {

        First blank = new First();

        First populated = new First(true);

        int value = NestedProperty<First,int>(blank,f => f.Second.Third.id);

        Console.WriteLine(value);

        value = NestedProperty<First,int>(populated,f => f.Second.Third.id);

        Console.WriteLine(value);

    }

    public E NestedProperty<T,E>(T Parent, Func<T,E> Path, E IfNullOrEmpty = default(E))

    {

        try

        {

            return Path(Parent);

        }

        catch

        {

            return IfNullOrEmpty;

        }

    }

}

​

public class First

{

    public Second Second { get; set; }

    public int id { get; set; }

    public First(){}

    public First(bool init)

    {

        this.id = 1;

        this.Second = new Second();

    }

}

​

public class Second

{

    public Third Third { get; set; }

    public int id { get; set; }

    public Second()

    {

        this.id = 1;

        this.Third = new Third();

    }

}

​

public class Third

{

    public int id { get; set; }

    public Third()

    {

        this.id = 1;

    }

}