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using AutoMapper;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Throw
{
    class Program
    {
        static List<int> testList = new List<int>() { 1,2,3,4,5 };
        static void Main(string[] args)
        {
            foreach (var item in testList)
            {
                Console.WriteLine(item);
            }
            Console.WriteLine();
            foreach (var item in Test())
            {
                Console.WriteLine(item);
            }
            Console.Read();
        }
        static IEnumerable<int> Test()
        {
            foreach (var item in testList)
            {
                if (item > 3)
                {
                    //yield可以记住游标
                    //所以必须配合IEnumberable<T>来使用
                    //IEnumerable是无法使用游标的
                    yield return item;
                }
            }
        }
    }
}