RE: DateTimePicker wrongly displays MinDate when dropdown is pressed.

Dear Julian,

I can reproduce this problem on Vista, however the same code works fine on
XP/Windows2003.
It seems on Vista, the underlying Windows MonthCalendar control has been
changed.

Someone had been reported this problem to our Connect feekback portal at:
https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?Feedba
ckID=358654&wa=wsignin1.0

After doing some research on this problem, I find out a way to prevent this
behavior.

=====Solution=====

private void Form1_Load(object sender, EventArgs e)
{
d = this.dateTimePicker1.MinDate;

this.dateTimePicker1.CloseUp += new
EventHandler(dateTimePicker1_CloseUp);
this.dateTimePicker1.DropDown += new
EventHandler(dateTimePicker1_DropDown);
}

DateTime d;

void dateTimePicker1_CloseUp(object sender, EventArgs e)
{
d = this.dateTimePicker1.Value;
}

void dateTimePicker1_DropDown(object sender, EventArgs e)
{
//Reset value for the DateTimePicker control
this.dateTimePicker1.Value = d;

//retrieve the handle of the MonthCalendar in the DateTimePicker
IntPtr p =
SendMessage(this.dateTimePicker1.Handle,DTM_GETMONTHCAL,0,0);

//Re-select the date on the MonthCalendar
SYSTEMTIME t = DateTimeToSysTime(new DateTime(d.Year, d.Month,
d.Day));
SendMessage(p, MCM_SETCURSEL, 0, t);
}

[DllImport("user32.dll")]
static extern IntPtr SendMessage(IntPtr hWnd, int Msg, int wParam,
int lParam);

[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr SendMessage(IntPtr hWnd, int msg, int
wParam, SYSTEMTIME lParam);

private const int DTM_FIRST = 0x1000;
private const int DTM_GETMONTHCAL = (DTM_FIRST + 8);
private const int MCM_SETCURSEL = 0x1002;

[StructLayout(LayoutKind.Sequential)]
public class SYSTEMTIME
{
public short wYear;
public short wMonth;
public short wDayOfWeek;
public short wDay;
public short wHour;
public short wMinute;
public short wSecond;
public short wMilliseconds;
}

private SYSTEMTIME DateTimeToSysTime(DateTime time)
{
return new SYSTEMTIME {
wYear = (short)time.Year,
wMonth = (short)time.Month,
wDayOfWeek = (short)time.DayOfWeek,
wDay = (short)time.Day,
wHour = (short)time.Hour,
wMinute = (short)time.Minute,
wSecond = (short)time.Second,
wMilliseconds = 0 };
}


===Documents for your information===

MCM_SETCURSEL Message
http://msdn.microsoft.com/en-us/library/bb761002(VS.85).aspx

If you need further help on this, please feel free to let me know.

Sincerely,
Zhi-Xin Ye
Microsoft Managed Newsgroup Support Team

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