根據當前時間獲取本周，下周，上周日期

實現點擊按鈕更改周，並獲取本周，上周，下周對應的具體日期

借鑒了一些網上的方法

         
         
         DateTime beginDate = getWeekUpOfDate(DateTime.Now, DayOfWeek.Monday, );
         DateTime endDate = getWeekUpOfDate(DateTime.Now, DayOfWeek.Sunday, );  

 
         
         
          DateTime getWeekUpOfDate(DateTime dt, DayOfWeek weekday,  wd1 = ( wd2 = ( wd2 == wd1 ? dt.AddDays( * Number) : dt.AddDays( * Number - wd2 + wd1);

   更改周 按鈕事件
          
                   
           btnThisWeek_Click(              beginDate = getWeekUpOfDate(DateTime.Now, DayOfWeek.Monday, );
             endDate = getWeekUpOfDate(DateTime.Now, DayOfWeek.Sunday, );  
    
          
                   
           btnLastWeek_Click(              beginDate = getWeekUpOfDate(DateTime.Now, DayOfWeek.Monday, -);
             endDate = getWeekUpOfDate(DateTime.Now, DayOfWeek.Sunday, );   
    
          
                   
           btnNextWeek_Click(              beginDate = getWeekUpOfDate(DateTime.Now, DayOfWeek.Monday, );
             endDate = getWeekUpOfDate(DateTime.Now, DayOfWeek.Sunday, );  
            

          
                   
                        DateTime beginTime =             DateTime endTime =             DateTime[] times = GetDateTime(beginTime, endTime);
              (times.Length >                    TextBox1.Text= times[].ToShortDateString();  
                  TextBox2.Text = times[].ToShortDateString();  
                  TextBox3.Text = times[].ToShortDateString();  
                  TextBox4.Text = times[].ToShortDateString();  
                  TextBox5.Text = times[].ToShortDateString();  
                  TextBox6.Text = times[].ToShortDateString();  
                  TextBox7.Text = times[].ToShortDateString();  
  
         }

          
                   
                       List<DateTime> timeList =  List<DateTime>              (; beginTime <= endTime; beginTime = beginTime.AddDays())
   
              DateTime[] times =                      }