asp.net 判断当前日期是该年中第几周的代码

直接上代码。

using System.Globalization;  
  
/// <summary>  
/// 获取某一日期是该年中的第几周  
/// </summary>  
/// <param name="dt">日期</param>  
/// <returns>该日期在该年中的周数</returns>  
private int GetWeekOfYear(DateTime dt)  
{ 
    //by www.jb200.com 
    GregorianCalendar gc = new GregorianCalendar();  
    return gc.GetWeekOfYear(dt, CalendarWeekRule.FirstDay, DayOfWeek.Monday);  
}