As you can see in the screenshot, this is a month calendar control and date picker control, a little like the built-in controls from Microsoft. It's not implemented using WPF, but is for WinForms applications.
While developing my own calendar/appointment calendar similar to the one in Outlook 2007, I needed a month calendar. There are many good ones out there, but not quite the way I needed. So, I started to develop my own. Along the way, I implemented not only a month calendar but also a date picker control.
Also, I thought, why not implement culture awareness into the controls, so people in different countries can use it too. That was more complex than I thought, and I ran into many problems regarding culture support, including some nasty bugs in the framework; more in detail later.
I thought to share the results here, because CodeProject has offered me solutions to my problems several times.
There is a new property
AllowPromptAsInput in the
Setting it to
true allows to enter dates including the current date separator as set in the
- culture aware - meaning you can set the used culture and calendar
- adjustable number of visible sub-calendars via the property
- fully customizable in regard to colors and fonts
- you can load or save the color table
- adjustable RTL or LTR layout
- can adjust whether to use shortest or abbreviated day names
- can adjust whether to show week header and footer
- adjustable non working days (for work week selection mode)
- adjustable first day of week
- adjustable day names (full/abbreviated/shortest)
- adjustable month names (full/abbreviated)
- adjustable month/day string patterns
- supports settable min/max date
- scrolling with mouse wheel
- different selection modes (single day/work week/full week/manual)
- adjustable maximum selectable days in manual selection mode
- bolded days collection
- new: extended bolded days (category and corresponding color definition)
- new: the manual selection mode now supports selection of multiple ranges with the CTRL key
- new: date separator now valid input in picker control
- adjustable scroll change (how many months to scroll when clicking an arrow)
- date picker control supports keyboard navigation
- disabled state support
Using the Code
Simply add the control project to your existing solution and reference it. The control is built with VS 2010, and the targeted framework version is 3.5.
Points of Interest
Regarding the culture awareness of the controls, I must admit that I cannot guarantee that all is correctly displayed and calculated. If there are errors, please feel free to post a message.
As mentioned earlier, while implementing culture awareness, I encountered some nasty bugs in the framework. One of these is as follows:
System.Globalization.Calendar implementation has a method
GetWeekOfYear(). And, every calendar has a property
MinSupportedDateTime. If you want to get the week of the year from that date, then in some cases, you get an
ArgumentOutOfRangeException although the date passed to the method is a valid one.
Calendar implementations affected are
JulianCalendar, and all implementations of
Another bug is in the
JapaneseCalendar where the method
GetYear() returns 0 for a specific date range.
It is highly possible that I didn't find all bugs regarding the calendar implementations, so if you set an unusual calendar like the
JapaneseLunisolarCalendar, it can happen that exceptions are thrown.
Customization of the MonthControl
The rendering of the control is handled by a separate renderer class. If you want to customize the drawing, then you can implement your own renderer by deriving from the abstract base class or the default renderer.
That's also true for the color table class which implements
Adjusting the MonthCalendar Control
One point you have to be aware of is that only non-neutral cultures can be set. The reason for that is, neutral cultures have no value for the
DateTimeFormat property, which I need for different reasons.
To adjust the visible sub-month views, you can directly set the
CalendarDimensions property, or use the designer.
Using the property
ColorTable, you can adjust the used colors, including whether to use gradient colors and the gradient mode or not.
Adjusting the DatePicker Control
The date in the text box part of the picker is displayed using the short date pattern, which you can also adjust. This pattern is also used when parsing a date.
The picker control has the
CheckDate event where you can check and set if the entered date is a valid one. If not valid, then the date is displayed using the colors of the
Another important property is
ClosePickerOnDayClick. With it, you can adjust whether the picker closes when clicking on a day, regardless of whether the day is already selected or not.
Extended Bolded Dates
The DatePicker and MonthCalendar controls now have two new properties:
The first collection holds the definitions of categories for bolded dates, and the second the bolded dates with corresponding category.
The original property for defining bold dates works as before.
Usage of Native Digits
Both controls have a new property :
This property converts any displayed number in the controls to a string containing the
NativeDigits from the current
If setting the current
Culture to Persian (fa-IR) then this culture has not arabic numerals
but persian numerals.
For instance the persian date 01.01.1390 in the format dd/MM/yyyy would then be displayed as
۰۱ / ۰۱ / ۱۳۹۰
Let me show you an image if setting a datepicker's
Culture and the
CultureCalendar to Persian:
Furthermore the manual input of an date uses the native digits too.
Please note that the displayed day names (probably the month names too) could be wrong,
because these values are taken from the .Net Framework
CultureInfo classes, specifically the
Persian day names (in this case the shortest day names) are incorrect due to a bug/feature of
the Persian (fa-IR)
The month control has the following important events:
DateChanged: Occurs when the month or year is changed via the context menu
DateClicked: Occurs when a day is clicked in the 'Day' selection mode
DateSelected: Occurs when a date or date range is selected
SelectionExtendEnd: Occurs when the selection extension ended
The date picker has an important event:
ValueChanged: Occurs when the date value changes
Both controls have one event in common:
ActiveDateChanged: Occurs when the mouse is over a date
- 1st December, 2009: Initial post.
- 12th October, 2011: Extended bold dates with categories.
- 22nd November, 2011: Extended selection to support multiple ranges.
- 14th June, 2012 :
- Implemented native digits usage
- changed project to VS 2010 project
- fixed bugs regarding the setting of month and day names of the FormatProvider
- fixed bug in internal parsing/displaying of dates
- now wheel scrolling with the mouse is prevented if the popup of the datepicker is open
- fixed an focus issue of the datepicker control
- some other small improvements and fixes
- 17th June, 2012 :
- the current date separator is now allowed as input in the DatePicker control
valid input is e.g. 06172012, 061712, 6/17/12 if the ShortDatePattern is set to
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