方法一: //最有含量的一种
int days = System.Threading.Thread.CurrentThread.CurrentUICulture.Calendar.GetDaysInMonth(DateTime.Now.Year ,DateTime.Now.Month);
方法二://最奇怪的一种
DateTime dtNow = DateTime.Today; int days = dtNow .AddDays(1 - dtNow .Day).AddMonths(1).AddDays(-1).Day;
方法三: //最常规的一种
DateTime dtNow = DateTime.Now; int days = DateTime.DaysInMonth(dtNow.Year ,dtNow.Month);
记得是在百度空间 转载的别人的. 忘记出处了. 呵呵.