委托的N种写法，你喜欢哪种？

    delegate string PlusStringHandle(string x, string y);
    class Program
    {
        static void Main(string[] args)
        {
            PlusStringHandle pHandle = new PlusStringHandle(plusString);
            Console.WriteLine(pHandle("abc", "edf"));

            Console.Read();
        }

        static string plusString(string x, string y)
        {
            return x + y;
        }
    }

            PlusStringHandle pHandle = new PlusStringHandle(delegate(string x, string y)
            {
                return x + y;
            });
            Console.WriteLine(pHandle("abc", "edf"));

            PlusStringHandle pHandle = (string x, string y) =>
            {
                return x + y;
            };
            Console.WriteLine(pHandle("abc", "edf"));

            PlusStringHandle pHandle = (x, y) =>
            {
                return x + y;
            };
            Console.WriteLine(pHandle("abc", "edf"));

        delegate void WriteStringHandle(string str);
        static void Main(string[] args)
        {
            //如果只有一个参数
            WriteStringHandle handle = p => Console.WriteLine(p);
            handle("lisi");

            Console.Read();
        }

        static void Main(string[] args)
        {
            WritePrint<int>(p => Console.WriteLine("{0}是一个整数", p), 10);

            Console.Read();
        }

        static void WritePrint<T>(Action<T> action, T t)
        {
            Console.WriteLine("类型为：{0}，值为：{1}", t.GetType(), t);
            action(t);
        }

    class Program
    {   
        static void Main(string[] args)
        {
            string str = "所有童鞋：".plusString(p => p = p + " girl： lisi、lili\r\n").plusString(p => p + "boy: wangwu") ;
            Console.WriteLine(str);

            Console.Read();
        }
    }

    static class Extentions
    {
        public static string plusString<TParam>(this TParam source, Func<TParam, string> func)
        {
            Console.WriteLine("字符串相加前原值为：{0}。。。。。。", source);
            return func(source);
        }
    }