星期一从星期一开始如何简化逻辑？

我有这段代码可以在一周内得到日期。但是这个代码需要星期一作为硬编码。如何使这4行灵活的地方其评论"//Special check for Sunday because acc. to our business week Starts from Monday and DayOfWeek Enum starts from Sunday."星期一从星期一开始如何简化逻辑？

我的意思是可以var计算在一个单一的行，没有其他条件？所以明天如果决定星期天是开始日期，那么不需要做任何改变。

class Program 
{ 
    static void Main(string[] args) 
    { 
     DateTime weekDate = GetWeekDate(DateTime.Now, DayOfWeek.Friday); 
     Console.WriteLine(weekDate); //prints 14-02-2014 
     Console.ReadLine(); 
    } 

    private static DateTime GetWeekDate(DateTime dt, DayOfWeek dow) 
    { 
     DateTime sow; 
     int var = 0; 
     sow = StartOfWeek(dt); 

     if (dow == 0) //Special check for Sunday because acc. to our business week Starts from Monday and DayOfWeek Enum starts from Sunday. 
      var = 6; 
     else 
      var = (int)dow - 1; 

     return sow.AddDays(var); 

    } 

    public static DateTime StartOfWeek(DateTime dt) 
    { 
     int days = dt.DayOfWeek - DayOfWeek.Monday; //Week Starts from Monday 

     if (days < 0) 
      days += 7; 

     return dt.AddDays(-1 * days).Date; 
    } 
}

来源

2014-02-13 Nikhil Agrawal

使用全球化的第一天DateTimeFormat –