using System;

using System.Collections.Generic;

public class Program

{

    public class DistributorTarget

    {

        public string Subject { get; set; }

        public string Body { get; set; }

    }

    public abstract class Distributor<T> where T : DistributorTarget

    {

        public abstract bool IsDistributing();

    }

    public class LogDistributorTarget : DistributorTarget

    {

    }

​

    public class LogDistributor : Distributor<LogDistributorTarget>

    {

        public override bool IsDistributing()

        {

            return false;

        }

    }

    private Dictionary<Type, object> distributors = new Dictionary<Type, object>();

    public void Main()

    {

        LogDistributor logDistributor = new LogDistributor();

        distributors.Add(typeof(LogDistributorTarget), logDistributor);

        Console.WriteLine("Value of Type LogDistributor is " + distributors[typeof(LogDistributorTarget)]);

        var dist = distributors[typeof(LogDistributorTarget)];

        Console.WriteLine("Value of var is " + dist);

    }

}