int[] ints = { 1, 2, 3, 4, 5, 6, 7, 8 };
	//Aggregate 第一个参数是用来给计数器total定义初始值的
	int nums = ints.Aggregate(0,(total, next) =>

			next % 2 == 0 ? total + 1 : total
	) ;
	Console.WriteLine(nums);
	Console.ReadLine();