/// <summary>
        /// 逐个对象执行predicate并获得返回值
        /// </summary>
        /// <typeparam name="TSource"></typeparam>
        /// <param name="source"></param>
        /// <param name="predicate"></param>
        /// <returns></returns>
        public static IEnumerable<TSource> Each<TSource>(this IEnumerable<TSource> source, Func<TSource, TSource> predicate)
        {
            foreach(TSource t in source)
   {
                yield return predicate(t);
   }
        }

 

IEnumerable<int> arr= new int[] { 1, 2, 3, 4 }.Each(info => info = info + 10);

运行结果：arr=new int[] { 11, 12, 13, 14 }