为拓展方法传递lambda表达式

    class Program
    {
        static void Main(string[] args)
        {
            
            string[] names = { "Burke", "Connor", "Frank", "Everett", "Albert", "George", "Harris", "David" };


            //为扩展方法传Lambda 做参数，lambda表达式会被转化成匿名方法，匿名方法会转化成委托。注意，我们这里的扩展方法要求的参数是委托类型的实例
            IEnumerable<string> myQuery =
                names.Where(s => s.Length == 5)
                .OrderBy(s => s)
                .Select(s => s.ToLower());


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

        }

    }