c# - 在日历控件中自定义选择

Question

我在 Asp.Net 中使用日历控件。我要实现的条件是“如果用户从一周中选择一个特定的工作日，他不应该能够从任何不同的周中选择任何其他日期”。比如，所有的选择都应该在一周内完成。但是我无法弄清楚如何禁用选定日期那一周以外的其余几周。

Answer 1

I would go about it like this.. when the selected date is changed, get the start and end of that particular week.然后，在呈现每一天时，确保这一天在该周范围内。

private DateTime? _firstDayOfWeek;
private DateTime? _lastDayOfWeek;

protected void yourCalendar_SelectionChanged(object sender, EventArgs e)
{
    var selectedDate = yourCalendar.SelectedDate;

    DayOfWeek firstDay = CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek;

    _firstDayOfWeek = selectedDate.Date;
    while (_firstDayOfWeek.Value.DayOfWeek != firstDay)
        _firstDayOfWeek = _firstDayOfWeek.Value.AddDays(-1);

    _lastDayOfWeek = selectedDate.Date;
    while (_lastDayOfWeek.Value.DayOfWeek != _firstDayOfWeek.Value.AddDays(6).DayOfWeek)
        _lastDayOfWeek = _lastDayOfWeek.Value.AddDays(1);
}

protected void yourCalendar_DayRender(object sender, DayRenderEventArgs e)
{
    if (_firstDayOfWeek.HasValue && _lastDayOfWeek.HasValue)
    {
        // There are dates to work with now, so check to see if the day falls
        // outside of the week range...
        if (e.Day.Date.Ticks < _firstDayOfWeek.Value.Ticks || e.Day.Date.Ticks > _lastDayOfWeek.Value.Ticks)
            e.Day.IsSelectable = false;
    }
}