using System;

using System.Collections.Generic;

using System.ComponentModel;

public class Program

{

     public class Person

     {

         public string FirstName { get; set; }

         public string LastName { get; set; }

         public Address Address { get; set; }

     }

    public class Address

    {

        public string Street { get; set; }

        public int PostalCode { get; set; }

    }

    public static void Main()

    {

        var person = new Person

        {

            FirstName = "Jon",

            LastName = "Doe",

            Address = new Address

            {

                Street = "Melkbos",

                PostalCode = 90210

            }

        };

        var result = person.ToDictionary();

         //desired output

         //var variableValues = new Dictionary<string, object>

         //{

         //  {"FirstName", "Jon"},

         //  {"LastName", "Doe"},

         //  {"Address.Street", "Melkbos"},

         //  {"Address.PostalCode", 90210},

         //};

        Console.WriteLine(result);

    }

}

​

​

public static class ObjectToDictionaryHelper

{

    public static IDictionary<string, object> ToDictionary(this object source)

    {

        return source.ToDictionary<object>();

    }

    public static IDictionary<string, T> ToDictionary<T>(this object source)

    {

        if (source == null)

            ThrowExceptionWhenSourceArgumentIsNull();

        var dictionary = new Dictionary<string, T>();

        foreach (PropertyDescriptor property in TypeDescriptor.GetProperties(source))

            AddPropertyToDictionary<T>(property, source, dictionary);

        return dictionary;

    }

    private static void AddPropertyToDictionary<T>(PropertyDescriptor property, object source, IDictionary<string, T> dictionary)

    {

        var value = property.GetValue(source);

        if (IsOfType<T>(value))

            dictionary.Add(property.Name, (T)value);

    }

    private static bool IsOfType<T>(object value)

    {

        return value is T;

    }

    private static void ThrowExceptionWhenSourceArgumentIsNull()

    {

        throw new ArgumentNullException("source", "Unable to convert object to a dictionary. The source object is null.");

    }

}