字典表+委托替代switch解决思路

namespace 解决Switch
{
    class Program
    {
        delegate string func();

        static void Main(string[] args)
        {
            var dict = new System.Collections.Generic.Dictionary<string, func>();

            dict["apple"] = new func(apple);
            dict["google"] = new func(google);
            dict["ibm"] = new func(ibm);

            string cmd;
            while ("exit" != (cmd = System.Console.ReadLine()))
            {
                if (dict.ContainsKey(cmd))
                    System.Console.WriteLine(dict[cmd]());
            }
        }

        static string apple() { return "apple()哈哈哈"; }
        static string google() { return "google()嘻嘻嘻"; }
        static string ibm() { return "ibm()呵呵呵"; }
    }
}