using System;

using System.Reflection;

public class Program

{

    public static void Main()

    {

        C obj = new C();

        obj.objB = new B();

        obj.objB.objA = new A(){ Valor = "Valor de A" };

        string x = Teste.ObterValor(obj, "objB.objA.Valor").ToString();

        Console.WriteLine("Achou o valor: " + x);

    }

}

​

public static class Teste

{

    public static object ObterValor(object obj, string prop)

    {

        string[] props = prop.Split('.');

        PropertyInfo pi = obj.GetType().GetProperty(props[0]);

        var xObj = pi.GetValue(obj, null);

        if (props.Length > 1)

        {

            string auxProp = String.Join(".", props,1, props.Length-1);

            return ObterValor(xObj, auxProp);

        }

        else

        {

            return xObj;

        }

    }

}

​

​

​

public class A

{

    public string Valor {get;set;}

}

​

public class B

{

    public A objA {get;set;}

}

​

public class C

{

    public B objB {get;set;}

}