蔷

摘要： int y;if (!int.TryParse(year, out y)){y = DateTime.Now.Year;}this.lbYearNow.Text = y.ToString();当year为null时此时int.TryParse(year, out y)为false;会执行y=DateTime.Now.Year;y.ToString()=当前年；当year为2011，2012时，此时int.TryParse(year,out y)为true;此时y=2011,2012,不会执行y=DateTime.Now.Year; 阅读全文