VS.NET获取某年某月的天数

public static int getDaysOfMonth(int theYear, int theMonth)//獲取某年某月的天數
{
int days = 0;
switch (theMonth)
{
case 1:
days = 31;
break;
case 2:
if (DateTime.IsLeapYear(theYear))
{
//闰年二月为29天
days = 29;
}
else
{
//不是闰年，二月为28天
days = 28;
}
break;
case 3:
days = 31;
break;
case 4:
days = 30;
break;
case 5:
days = 31;
break;
case 6:
days = 30;
break;
case 7:
days = 31;
break;
case 8:
days = 31;
break;
case 9:
days = 30;
break;
case 10:
days = 31;
break;
case 11:
days = 30;
break;
case 12:
days = 31;
break;
}

return days;
}