9. 產生操作符—【LINQ標準查詢操作符】

public class Empty_LINQ    {        public static void Empty_Print()        {            string[] name1 = { "Asfs", "Steve" };            string[] name2 = { "Joe", "Jhon", "Sawyer", "Sayid" };            string[] name3 = { "Dave", "Kate", "Juliet", "Sara" };            List<string[]> names = new List<string[]> { name1, name2, name3 };            IEnumerable<string> nameList = names.Aggregate(Enumerable.Empty<string>(),                (current, next) => next.Length > 2 ? current.Union(next) : current);            foreach (string s in nameList)            {                Console.WriteLine(s);            }        }        public static void Range_Print()        {            foreach (var item in Enumerable.Range(1,10))            {                Console.WriteLine(item.ToString());            }            foreach (var item in Enumerable.Range(1, 10).Reverse())            {                Console.WriteLine(item.ToString());            }            foreach (var item in Enumerable.Range(1, 5).Select(x => x * 5))            {                Console.WriteLine(item.ToString());            }        }        public static void Repeat_Print()        {            foreach (var item in Enumerable.Repeat("I love you",3))            {                Console.WriteLine(item.ToString());            }        }    }