C#中的高阶函数介绍

    //定义扩展方法
    public static class ExtensionByIEnumerable
    {
        public static IEnumerable<TSource> TakeWhileSelf<TSource>(this IEnumerable<TSource> source, Function<TSource, bool> predicate)
        {
            foreach (TSource iteratorVariable0 in source)
            {
                if (!predicate(iteratorVariable0))
                {
                    break;
                }
                yield return iteratorVariable0;
            }
        }
    }
    class Program
    {
        //定义个委托

        static void Main(string[] args)
        {
            List<int> myAry = new List<int> { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };

            Function<int, bool> predicate = (num) => num < 4;  //定义一个函数

            IEnumerable<int> q2 = myAry.TakeWhileSelf(predicate);  //

            foreach (var item in q2)
            {
                Console.WriteLine(item);
            }
            /*
             * output:
             * 1
             * 2
             * 3
             */
        }
    }

            /*
             * output:
             * true
             */

  static Function<int, bool> OutPutMehtod()
        {
            Function<int, bool> predicate = (num) => num < 4;  //定义一个函数

            return predicate;
        }