为拓展方法传递委托

    class Program
    {
        static void Main(string[] args)
        {
            string[] names = { "Burke", "Connor", "Frank", "Everett", "Albert", "George", "Harris", "David" };
            
            //Where扩展方法，要求的是委托实例
            //01传一个命名方法
            var fiveNameA = names.Where(IsLengthFive);
            //02匿名方法
            var fiveNameB = names.Where(
                delegate(string s) { return s.Length == 5; }
                );

            //03 静态类中静态方法的调用
            IEnumerable<string> fiveNameC = Enumerable.Where(names, delegate(string s) { return s.Length == 5; });

            foreach (var item in fiveNameC)
            {
                Console.WriteLine(item.ToString());
            }
            //04对03的结果排序
            var fiveNameOrdered = fiveNameC.OrderBy(
                delegate(string s) { return s; }
             );
            foreach (var item in fiveNameOrdered)
            {
                Console.WriteLine(item.ToString());
            }
            /**/
            Console.WriteLine("************************");
            //为扩展方法传递匿名方法(匿名委托实例)
            IEnumerable<string> myQuery =
                //names.Where(IsLengthFive)
                names
                .Where(delegate(string s) { return s.Length == 5; })
                .OrderBy(delegate(string s) { return s; })
                .Select(delegate(string s) { return "你好：" + s.ToLower(); });

            foreach (string item in myQuery)
            {
                Console.WriteLine(item);
            }




        }

        private static bool IsLengthFive(string s)
        {
            //if (s.Length == 5)
            //{
            //    return true;
            //}
            //else
            //{
            //    return false;
            //}
            return s.Length == 5;
        }

    }