摘要: namespace ConsoleApplication1 { class Program { static void Main(string[] args) { int? a; a = null;//此时输出3 //a = 6;//此时输出6 int b = a ?? 3; Console.Wri 阅读全文
posted @ 2016-09-13 10:04 BlankMood 阅读(9210) 评论(1) 推荐(4) 编辑