using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Func<int, int, int> Sum = (a, b) => a + b;

        Dictionary<char, Func<int, int, int>> operations = new Dictionary<char, Func<int, int, int>>();

        operations.Add('+', Sum);

        var operation = operations['+'];

        var result = operation(1, 2); // yields 3

        Console.WriteLine(result);

    }

}