using System;

using System.Collections.Generic;

using Newtonsoft.Json;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World " + GroupedProperty.FromString("cat:prop"));

        var dic1 = new Dictionary<GroupedProperty, string>();

        var dic2 = new Dictionary<string, string>();

        dic1["a:b"] = "value";

        dic2["a:b"] = "value";

        Dump(dic1);

        Dump(dic2);

    }

​

    private static void Dump<T>(T value)

    {

        Console.WriteLine(JsonConvert.SerializeObject(value, Formatting.Indented));

        Console.WriteLine(JsonConvert.SerializeObject(JsonConvert.DeserializeObject(JsonConvert.SerializeObject(value, Formatting.Indented)), Formatting.Indented));

    }

​

    /// <summary>

    /// A property key based on both a group name and a property name

    /// </summary>

    public class GroupedProperty

    {

        public string GroupName

        {

            get;

            set;

        }

​

        public string PropertyName

        {

            get;

            set;

        }

​

        public static GroupedProperty FromString(string value)

        {

            if (value == null)

                return null;

            var values = value.Split(new[]{':'}, 2);

            if (values.Length == 2)

            {

                return new GroupedProperty{GroupName = values[0], PropertyName = values[1]};

            }

            else

            {

                return new GroupedProperty{GroupName = "", PropertyName = values[0]};

            }

        }

​

        public static implicit operator string (GroupedProperty value) => value.ToString();

        public static implicit operator GroupedProperty(string value) => FromString(value);

        public override string ToString() => $"{GroupName}:{PropertyName}";

        public override int GetHashCode() => ToString().GetHashCode();

        public override bool Equals(object obj)

        {

            if (obj is GroupedProperty value)

            {

                return ToString() == value.ToString();

            }

​

            return false;

        }

    }

}