Question

When the month forward or backward arrow is clicked on my DateTimePicker control it repeatedly fires the ValueChanged event. I have to use the debugger to stop the application.

注:只要我点点点一个日期,我的申请就可进行罚款。

The MSDN documentation shows examples for creating the control. But I cannot find any example function called dateTimePicker1_ValueChanged(). The skeleton for this function was created for me, when I double clicked on the control in the VS.NET2008 designer.

Answer 1

Dave81 set me on to the right track. If you do what he says, the problem is, that when the user changes the value manually, the CloseUp event obviously isn t triggered. The way I ve fixed this problem with the constant re-firing of the month change event, is to change my ValueChanged event to only refresh if the calendar isn t dropped down. I.e.:

private bool _calendarDroppedDown = false;
//called when calendar drops down
private void dateStartDateTimePicker_DropDown(object sender, EventArgs e)
{
  _calendarDroppedDown = true;
}
//called when calendar closes
private void dateStartDateTimePicker_CloseUp(object sender, EventArgs e)
{
  _calendarDroppedDown = false;
  RefreshToolbox(null, null); //NOW we want to refresh display
}

//This method is called when ValueChanged is fired
public void RefreshToolbox(object sender, EventArgs e)
{ 
  if(_calendarDroppedDown) //only refresh the display once user has chosen a date from the calendar, not while they re paging through the days.
    return;
  ...
}

Answer 2

我不清楚你想要达到什么目标,但我的猜测是,例如,你想要展示一个信息箱或类似的东西。如果是这样的话,就不会有担心,因为你正面临同样的问题,我很想在一段时间前会问。 www.un.org/Depts/DGACM/index_french.htm - event, use the CloseUp -event.CloseUp - 只有在用户最终选择某种价值时,才会启动发明。希望是你们所期待的。如果希望更新,例如向用户显示的某些计算方法,你将使用ValueChanged<>。 - 发明。

Answer 3

When you click on the down arrow of a datetimepicker, it displays a default date. When you click on any date in the datetime picker, it fires the datetimepicker1_valuechanged event. Whatever you have put the skeleton for the event, works fine then. Unnikrishnan C

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