C# で汎関数 thanks to http://d.hatena.ne.jp/p-nix/20090226/p1

gistfile1.cs

//
// C# で汎関数
// http://d.hatena.ne.jp/p-nix/20090226/p1
//

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            process(add);
            process(mul);

            while (Console.ReadKey().ToString() == "") ;
        }

        private static int add(int x, int y)
        {
            return x + y;
        }

        private static int mul(int x, int y)
        {
            return x * y;
        }

        private static void process(Func<int, int, int> calc)
        {
            Console.WriteLine("前処理");
            Console.WriteLine(calc(2, 3));
            Console.WriteLine("後処理");
        }
    }
}