摘要: 判断对象是否为null否则报错 string? a = string.Empty; if (a is null) if (ReferenceEquals(a, null)) if (a == null) public void GetUser(string name) => ArgumentNull 阅读全文
posted @ 2023-03-20 17:02 雨水的命运 阅读(133) 评论(0) 推荐(0) 编辑