mapper

mapper.cs

using System;
using System.Collections.Generic;
using ParameterizedFunc = System.Func<object, object>;

namespace CompanyName.Helpers
{
	public class Mapper
	{
		private readonly IDictionary<(Type, Type), ParameterizedFunc> objectDictionary = 
			new Dictionary<(Type, Type), ParameterizedFunc>();

		public void Register<TSource, TDestination>(Func<TSource, TDestination> mapping)
			where TSource : class
			where TDestination : class
		{
			var key = ToKey<TSource, TDestination>();
			objectDictionary[key] = (arg) => mapping((TSource)arg);
		}

		public TDestination Map<TSource, TDestination>(TSource source)
			where TSource : class
			where TDestination : class
		{
			var key = ToKey<TSource, TDestination>();
			return (TDestination)objectDictionary[key](source);
		}

		private (Type, Type) ToKey<TSource, TDestination>()
		{
			return (typeof(TSource), typeof(TDestination));
		}
	}
}