c# - yield

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yield关键字可以概括为一句话：对于返回值为集合的函数，使用yield return，可以每次返回集合中一个元素。

namespace YieldTest{    using System;    using System.Collections.Generic;    class Program    {        static void Main(string[] args)        {            // Call getter            Console.WriteLine("----Results of Get():");            foreach (var item in YieldTest.A)            {                Console.WriteLine(item);            }            // Call method            Console.WriteLine("----Results of Power():");            foreach(var result in YieldTest.Power(2, 10))            {                Console.WriteLine(result);            }        }    }    public class YieldTest     {        // Yield in Getter.        public static IEnumerable<string> A         {            get             {                yield return "Hello";                yield return "World";                yield return "I'm";                yield return "Yield";            }        }        // Yield in method.        public static IEnumerable<int> Power(int x, int exponent)        {            int result = 1;            for (int i = 0; i < exponent; i++)            {                result = result * x;                yield return result;            }        }    }}

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