今天有朋友问题我如何获取某年中第几个礼拜的时间范围，似乎以前好像记得.NET有，不过今天一查没有翻到，在google搜索到这个，希望以后能自己用上，测试已经通过。
public static void Main()
{DateTime date1 = GoToWeek(2012, 2);
Console.Write(date1.ToString());
Console.Read();
}private static DateTime GoToWeek(int year, int week)
{
// use the current culture
System.Globalization.CultureInfo ci = System.Threading.Thread.CurrentThread.CurrentCulture;// get first day of week from culture
DayOfWeek fdow = ci.DateTimeFormat.FirstDayOfWeek;// new empty Date (so starts 01/01/0001)
DateTime d = new DateTime();// year starts at 1, so take away 1 from desired year to prevent going to the next one
d = d.AddYears(year - 1);// get day January 1st falls on
int startDay = (int)d.DayOfWeek;// get the difference between the first day of the week, and the day January 1st starts on
int difference = (int)fdow - startDay;
// if it is positive (i.e. after first day of week), take away 7
if (difference > 0)
{
difference = difference - 7;
}// already on week 1, so add desired number of weeks - 1 * days in week
if (week > 1)
{
d = d.AddDays((week - 1) * 7 + difference);
}return d;
}private static int WeekOfYear(DateTime date)
{
// use the current culture
System.Globalization.CultureInfo ci = System.Threading.Thread.CurrentThread.CurrentCulture;
// use current culture's calendar
System.Globalization.Calendar cal = ci.Calendar;
// get the calendar week rule (i.e. what determines the first week in the year)
System.Globalization.CalendarWeekRule cwr = ci.DateTimeFormat.CalendarWeekRule;
// get the first day of week for the current culture
DayOfWeek fdow = ci.DateTimeFormat.FirstDayOfWeek;
// return the week
return cal.GetWeekOfYear(date, cwr, fdow);
}
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