如何在 DatePicker 中使一周中的某些天不可用

Posted 2023-05-07

【中文标题】如何在 DatePicker 中使一周中的某些天不可用

【英文标题】：How to make some days of the week in DatePicker unavailable

【发布时间】：2021-02-20 20:35:56

【问题描述】：

我正在从数据库中获取星期几的序列号，我希望在 DatePicker 中提供星期几，而其余日期不可用。但是除了最后一天（在我的情况下，这是一年中的最后一天）之外，所有日子都变得不可用。我究竟做错了什么？我以链接中的代码为基础：How to black out specific days of the week (datepicker) [VB]（顺便说一句，它有效）。

using (OracleConnection conn = new OracleConnection(connectionString))
                
    int year = DateTime.Now.Year;
    var minDate = DateTime.Now;
    var maxDate =new DateTime(year, 12, 31);
    string r;
    string st = comboBox2.SelectedItem.ToString();
    string sql3 = "select distinct id_week from timetable,masters where 
    timetable.id_mas=masters.cod and masters.fio = '" + st + "'";
    using (OracleCommand command = new OracleCommand(sql3, conn))
    
        OracleDataReader reader3 = command.ExecuteReader();

        while (reader3.Read())
        
            r = reader3[0].ToString();

            for (var d = minDate; d <= maxDate> d; d = d.AddDays(1))
            
                if ((int)d.DayOfWeek != Convert.ToInt32(r))
                
                    dateTimePicker1.BlackoutDates.Add(new CalendarDateRange(d));
                
            
        

        reader3.Close();
    

【问题讨论】：

MonthlyCalendar.DisplayDateEnd = new DateTime(2020, 3, 31);

【参考方案1】：

要完成这项工作，有必要改变一些逻辑。

 int dayOfWeek;
 IList<DayOfWeek> dow = new List<DayOfWeek>();

 using (OracleDataReader reader3 = command.ExecuteReader())
 
     // Prepare days of week that should be available
     while (reader3.Read())
     
         var r = reader3[0].ToString();     
         if (Int32.TryParse(r, out dayOfWeek))
         
             dow.Add((DayOfWeek)dayOfWeek); 
         
     
 
 
 // Now prepare the calender  
 for (var d = minDate; d <= maxDate; d = d.AddDays(1))
  
     // If day of week not included to the list then blackout it.                
     if (!dow.Contains(d.DayOfWeek))
     
         dateTimePicker1.BlackoutDates.Add(new CalendarDateRange(d));