Moving the calendar back and forward through dates

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   Using 9.81 ActiveX
I keep getting the following error when the user press the forward or back button below is the error and below that is the code which produces the error. This problem does not show on my computer but only on some computers.

Exception: 

System.Exception: TargetInvocationException in Navigate_Cal_Back_And_Forward()., CalendarControl.ViewType = xtpCalendarDayView, CalendarControl.ActiveView.DaysCount = 1, date range = 2006-11-02 00:00:00.000 to 2006-11-02 00:00:00.000

Stack Trace:

JotmeApp.Calendar.CalendarBoardControl.Navigate_Cal_Back_And_Forward
   at JotmeApp.Calendar.CalendarBoardControl.Navigate_Cal_Back_And_Forward(Boolean forward)
   at JotmeApp.Calendar.CalendarBoardControl.Cal_Move_Forward_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Label.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Now the code which produces the error:

private void Navigate_Cal_Back_And_Forward(bool forward)

{
DateTime DateBegin = DateTime.Today;

DateTime DateEnd = DateTime.Today;

AxXtremeCalendarControl.AxDatePicker datePicker = this.mainFromRef.DatePicker;

if (datePicker.Selection.BlocksCount > 0)

{

DateBegin = datePicker.Selection[0].DateBegin; 

DateEnd = datePicker.Selection[0].DateEnd;
}

switch (CalendarControl.ViewType) 

{
case CalendarViewType.xtpCalendarDayView:

case CalendarViewType.xtpCalendarWorkWeekView:

//************ DEBUG VERSION ******************************************

int daysCount = CalendarControl.ActiveView.DaysCount;

DateTime rangeStart = DateBegin.AddDays(forward

? daysCount
: -daysCount
);
DateTime rangeEnd = DateEnd.AddDays(forward

? daysCount
: -daysCount
);
Application.DoEvents();

try

{
if (!CalendarControl.IsDisposed)

{
CalendarControl.DayView.ShowDays(rangeStart, rangeEnd);
}
}
catch (Exception ex)

{
throw new Exception(ex.GetType().Name + " in Navigate_Cal_Back_And_Forward()."

+ ", CalendarControl.ViewType = " + CalendarControl.ViewType.ToString()

+ ", CalendarControl.ActiveView.DaysCount = " + daysCount

+ ", date range = " + rangeStart.ToString("yyyy-MM-dd HH:mm:ss.fff")

+ " to " + rangeEnd.ToString("yyyy-MM-dd HH:mm:ss.fff")

);
}
//************ DEBUG VERSION ******************************************

break;

case CalendarViewType.xtpCalendarMonthView:

if (forward)

{
CalendarControl.ViewChanged -= new System.EventHandler(this.CalendarControl_ViewChanged);

CalendarControl.ActiveView.ShowDay(DateEnd.AddDays(5), true);

CalendarControl.ViewChanged += new System.EventHandler(this.CalendarControl_ViewChanged);

CalendarControl.ViewType = XtremeCalendarControl.CalendarViewType.xtpCalendarMonthView;

}
else

{
CalendarControl.ViewChanged -= new System.EventHandler(this.CalendarControl_ViewChanged);

CalendarControl.ActiveView.ShowDay(DateBegin.AddDays(-5), true);

CalendarControl.ViewChanged += new System.EventHandler(this.CalendarControl_ViewChanged);

CalendarControl.ViewType = XtremeCalendarControl.CalendarViewType.xtpCalendarMonthView;

}
break;

case CalendarViewType.xtpCalendarWeekView:

if (forward)

{
CalendarControl.ActiveView.ShowDay(DateEnd.AddDays(1), false);

}
else

{
CalendarControl.ActiveView.ShowDay(DateBegin.AddDays(-1), false);

}
break;

}
}

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WaaZ Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 31 January 2006 Location: United Kingdom Status: Offline Points: 103	Post Options Post Reply Quote WaaZ Report Post Thanks(0) Quote Reply Topic: Moving the calendar back and forward through dates Posted: 01 November 2006 at 7:16am
	Using 9.81 ActiveX I keep getting the following error when the user press the forward or back button below is the error and below that is the code which produces the error. This problem does not show on my computer but only on some computers. Exception: System.Exception: TargetInvocationException in Navigate_Cal_Back_And_Forward()., CalendarControl.ViewType = xtpCalendarDayView, CalendarControl.ActiveView.DaysCount = 1, date range = 2006-11-02 00:00:00.000 to 2006-11-02 00:00:00.000 Stack Trace: JotmeApp.Calendar.CalendarBoardControl.Navigate_Cal_Back_And_Forward at JotmeApp.Calendar.CalendarBoardControl.Navigate_Cal_Back_And_Forward(Boolean forward) at JotmeApp.Calendar.CalendarBoardControl.Cal_Move_Forward_Click(Object sender, EventArgs e) at System.Windows.Forms.Control.OnClick(EventArgs e) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.Label.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) Now the code which produces the error: private void Navigate_Cal_Back_And_Forward(bool forward) { DateTime DateBegin = DateTime.Today; DateTime DateEnd = DateTime.Today; AxXtremeCalendarControl.AxDatePicker datePicker = this.mainFromRef.DatePicker; if (datePicker.Selection.BlocksCount > 0) { DateBegin = datePicker.Selection[0].DateBegin; DateEnd = datePicker.Selection[0].DateEnd; } switch (CalendarControl.ViewType) { case CalendarViewType.xtpCalendarDayView: case CalendarViewType.xtpCalendarWorkWeekView: //********** DEBUG VERSION ************************************** int daysCount = CalendarControl.ActiveView.DaysCount; DateTime rangeStart = DateBegin.AddDays(forward ? daysCount : -daysCount ); DateTime rangeEnd = DateEnd.AddDays(forward ? daysCount : -daysCount ); Application.DoEvents(); try { if (!CalendarControl.IsDisposed) { CalendarControl.DayView.ShowDays(rangeStart, rangeEnd); } } catch (Exception ex) { throw new Exception(ex.GetType().Name + " in Navigate_Cal_Back_And_Forward()." + ", CalendarControl.ViewType = " + CalendarControl.ViewType.ToString() + ", CalendarControl.ActiveView.DaysCount = " + daysCount + ", date range = " + rangeStart.ToString("yyyy-MM-dd HH:mm:ss.fff") + " to " + rangeEnd.ToString("yyyy-MM-dd HH:mm:ss.fff") ); } //******** DEBUG VERSION **************************************** break; case CalendarViewType.xtpCalendarMonthView: if (forward) { CalendarControl.ViewChanged -= new System.EventHandler(this.CalendarControl_ViewChanged); CalendarControl.ActiveView.ShowDay(DateEnd.AddDays(5), true); CalendarControl.ViewChanged += new System.EventHandler(this.CalendarControl_ViewChanged); CalendarControl.ViewType = XtremeCalendarControl.CalendarViewType.xtpCalendarMonthView; } else { CalendarControl.ViewChanged -= new System.EventHandler(this.CalendarControl_ViewChanged); CalendarControl.ActiveView.ShowDay(DateBegin.AddDays(-5), true); CalendarControl.ViewChanged += new System.EventHandler(this.CalendarControl_ViewChanged); CalendarControl.ViewType = XtremeCalendarControl.CalendarViewType.xtpCalendarMonthView; } break; case CalendarViewType.xtpCalendarWeekView: if (forward) { CalendarControl.ActiveView.ShowDay(DateEnd.AddDays(1), false); } else { CalendarControl.ActiveView.ShowDay(DateBegin.AddDays(-1), false); } break; } }

WaaZ Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 31 January 2006 Location: United Kingdom Status: Offline Points: 103	Post Options Post Reply Quote WaaZ Report Post Thanks(0) Quote Reply Posted: 03 November 2006 at 5:22am
	CodeJock people, I have a new patch comming out this weekend and I would really appreciate a reply. Thanks

sserge Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 01 December 2004 Status: Offline Points: 1297	Post Options Post Reply Quote sserge Report Post Thanks(0) Quote Reply Posted: 03 November 2006 at 11:50am
	Hi, I think I see the problem. It might happen because Dates are represented in OLE by Double values. And 2 equal Dates could be represented by not exactly same Doubles. The defference is small, but we have to keep in mind this when compare Dates. This is not implemented in ShowDays and as a result sometimes it removes all days and do not adds one. To avoid that use ShowDay method to show only one day. -- WBR, Serge

sserge Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 01 December 2004 Status: Offline Points: 1297	Post Options Post Reply Quote sserge Report Post Thanks(0) Quote Reply Posted: 03 November 2006 at 11:51am
	Another possible easy solution would be to add some amount of time to rangeEnd (1 minute for example). In this case Doubles should be compared fine... -- WBR, Serge