C# 獲取輸入日期為一年中的第幾周

 1 /// <summary>
 2 /// 獲取指定日期，在為一年中為第幾周
 3 /// </summary>
 4 /// <param name="dtWeek">指定時間</param>
 5 /// <reutrn>返回第幾周</reutrn>
 6 private static int GetWeekOfYear(DateTime dtWeek)
 7 {
 8 　　System.Globalization.GregorianCalendar gc = new System.Globalization.GregorianCalendar();
 9 　　int weekOfYear = gc.GetWeekOfYear(dtWeek,System.Globalization.CalendarWeekRule.FirstDay, DayOfWeek.Monday);
10 　　return weekOfYear;
11 }