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.NET Forum / Windows Forms / WinForm General / May 2007DateTimePicker.Value
Hi, I have DateTimePicker control on a winform. When user selects a date in that control, I am getting proper value using DateTimePicker.Value. But I want to know in case user does not select any date and closes DateTimePicker control by pressing escape key. Here in this case also I am getting today's date even if user did not select any date in that control. I should get null or something else that will let me know that user did not select anything and closed the DateTimePicker by pressing escape key. Any idea how to do that? Thanks! You can set the date to DateTime.MinValue instead of today's date. You can identify the chagne by using the events ValueChanged and ChangeUICues to identify the change. -VR > Hi, > [quoted text clipped - 12 lines] > > Thanks! Thanks for the reply. The user can select whatever date shown in the control so I can not come to know whether user has really selected any value or pressed escape key because in both cases I will get same value. On May 31, 10:24 am, VR Ravinuthala <VRRavinuth...@discussions.microsoft.com> wrote: > You can set the date to DateTime.MinValue > instead of today's date. [quoted text clipped - 26 lines] > > > Thanks! Hello Mahesh, If the user does not select a date and presses Esc, then you get the current value (the one that was shown before showing the drop down calendar) when you call Value. This is normal and what is expected. Best regards, Nicolas Cadilhac @ VisualHint (http://www.visualhint.com) Home of Smart FieldPackEditor.Net / DateTimePicker replacement Home of Smart PropertyGrid for .Net and MFC Microsoft PropertyGrid Resource List - http://www.propertygridresourcelist.com On May 31, 9:27 am, mahesh.nimbal...@gmail.com wrote: > Hi, > [quoted text clipped - 11 lines] > > Thanks! Thanks for the reply. User can select what is shown in the control while displaying that control. So I can not come to know that whether you has selected the date or pressed escape key. Thanks > Hello Mahesh, > [quoted text clipped - 26 lines] > > > Thanks! I'm not sure to understand what you mean. As another poster added, when the user selects a date you will get a ValueChanged event. When he hits ESC you won't. This should allow you to discriminate both cases. You have also the CloseUp event so that you know when the dropdown is closed. Best regards, Nicolas Cadilhac @ VisualHint (http://www.visualhint.com) Home of Smart FieldPackEditor.Net / DateTimePicker replacement Home of Smart PropertyGrid for .Net and MFC Microsoft PropertyGrid Resource List - http://www.propertygridresourcelist.com On May 31, 11:21 am, mahesh.nimbal...@gmail.com wrote: > Thanks for the reply. > [quoted text clipped - 34 lines] > > > > Thanks! I already tried ValueChanged event. But the problem with that is when user opens DateTimePicker control and closes it by pressing escape, even in this case also ValueChanged event gets fired. > I'm not sure to understand what you mean. > As another poster added, when the user selects a date you will get a [quoted text clipped - 50 lines] > > > > > Thanks! Indeed youre right. I just tried it. In fact you are partially right. Until I modify the displayed date, ValueChanged will be triggered even if ESC is hit. After a change it's not trigerred anymore on ESC. But anyway, if the user types the arrow keys to move the cue in the month calendar, ValueChanged is triggered and hitting ESC after would not help. At least this allows you to see how this native control is illogical. I am fixing all these oddities in Smart FieldPackEditor. Anyway, maybe you should do things differently. What is your exact goal ? If you want to know that ESC has been pressed, why not try to detect the fact that ESC is actually typed instead of relying on the Value property which won't never be null anyway... Best regards, Nicolas Cadilhac @ VisualHint (http://www.visualhint.com) Home of Smart FieldPackEditor.Net / DateTimePicker replacement Home of Smart PropertyGrid for .Net and MFC Microsoft PropertyGrid Resource List - http://www.propertygridresourcelist.com On May 31, 1:24 pm, mahesh.nimbal...@gmail.com wrote: > I already tried ValueChanged event. But the problem with that is when > user opens DateTimePicker control and closes it by pressing escape, [quoted text clipped - 54 lines] > > > > > > Thanks! On some event I am showing DateTimePicker control in open state. Now if users selected date, I would do some processing and user presses ESC, I would just ignore it. I main point here is that I just wanted to know whether user has selected any date or not. Because on that only I will be processing some data. I tried key press events also, but seems that if control is in open state, it will not fire any keyboard events. If you have any alternate solution to know if user has selected any date in control, please let me know. I am stuck now. Thanks! > Indeed youre right. I just tried it. In fact you are partially right. > Until I modify the displayed date, ValueChanged will be triggered even [quoted text clipped - 76 lines] > > > > > > > Thanks! When showing the picker in open state, why don't you record the initial date? When the CloseUp event occurs you would simply compare the old date with the one returned by Value... Not enough? Best regards, Nicolas Cadilhac @ VisualHint (http://www.visualhint.com) Home of Smart FieldPackEditor.Net / DateTimePicker replacement Home of Smart PropertyGrid for .Net and MFC Microsoft PropertyGrid Resource List - http://www.propertygridresourcelist.com On May 31, 2:47 pm, mahesh.nimbal...@gmail.com wrote: > On some event I am showing DateTimePicker control in open state. Now > if users selected date, I would do some processing and user presses [quoted text clipped - 92 lines] > > > > > > > > Thanks! Yes it will work except one case and that is not acceptable. The case is, user can select whatever is the default date shown in the DateTimePicker control and here I will not come to know that user has actually selected a date and not pressed ESC key if I compare default date with currently selected date. > When showing the picker in open state, why don't you record the > initial date? When the CloseUp event occurs you would simply compare [quoted text clipped - 105 lines] > > > > > > > > > Thanks! What you want to do is not so easy and maybe you should rethink the way you do it (showing the datetimepicker opened initially is not very intuitive and consistent with the OS after all). In Smart PropertyGrid I was using the MS DateTimePicker and I gave up because I was not able to achieve the same level of quality and usability than the other editors. At the end, I had reached a point where I had some message, keyboard and mouse hooks on the calendar popup and even then there was always something not satisfying. This has been the trigger to start a complete DateTimePicker replacement and I think this will be a real success. If you still want to go on this path, try to get the handle of the calendar and hook various messages so that you know what happens with the user interaction. Best regards, Nicolas Cadilhac @ VisualHint (http://www.visualhint.com) Home of Smart FieldPackEditor.Net / DateTimePicker replacement Home of Smart PropertyGrid for .Net and MFC Microsoft PropertyGrid Resource List - http://www.propertygridresourcelist.com On May 31, 3:26 pm, mahesh.nimbal...@gmail.com wrote: > Yes it will work except one case and that is not acceptable. The case > is, user can select whatever is the default date shown in the [quoted text clipped - 111 lines] > > > > > > > > > > Thanks! Al right. Can you please post some code sample how to hook key pressed event for this DateTimePicker control? > What you want to do is not so easy and maybe you should rethink the > way you do it (showing the datetimepicker opened initially is not very [quoted text clipped - 135 lines] > > > > > > > > > > > Thanks! In the DropDown event handler: hMonthCalendar = (IntPtr)SendMessage(dateTimePicker.Handle, 0x1008 / *DTM_GETMONTHCAL*/, 0, 0); You will find on CodeProject several articles about hooks. Here is one: http://www.codeproject.com/csharp/globalhook.asp (don't know if it's the best). Best regards, Nicolas Cadilhac @ VisualHint (http://www.visualhint.com) Home of Smart FieldPackEditor.Net / DateTimePicker replacement Home of Smart PropertyGrid for .Net and MFC Microsoft PropertyGrid Resource List - http://www.propertygridresourcelist.com On May 31, 4:32 pm, mahesh.nimbal...@gmail.com wrote: > Al right. Can you please post some code sample how to hook key pressed > event for this DateTimePicker control? [quoted text clipped - 138 lines] > > > > > > > > > > > > Thanks! Thank you! > In the DropDown event handler: > [quoted text clipped - 156 lines] > > > > > > > > > > > > > Thanks! Free MagazinesGet these publications absolutely FREE for up to 12 months. 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