using System;

using System.Collections.Generic;

public class Program

{

    public static Dictionary<Type, Func<object, object>> dict = new Dictionary<Type, Func<object, object>>();

    public static object Call<T>(T argument) {

        var func = dict[typeof(T)];

        return func.Invoke((object)argument);

    }

    public static string TestFunction(string val)

    {

        return val + " was typecast";

    }

    public static Func<object, object> Wrap<T, TResult>(Func<T, TResult> func)

    {

        Func<object, object> wrapped = arg => func((T)arg);

        return wrapped;

    }

    public static void Main()

    {       

        Func<string, string> testFunction = TestFunction;

        dict[typeof(string)] = Wrap(testFunction);

        System.Console.WriteLine(Call("argIn"));

    }

}