VB.net Programmably drop down the DateTimePicker

问题

Hey all i have this code here:

Call SendMessage(dtPicker.Handle, CB_SHOWDROPDOWN, True, 0&)

That works fine on comboboxes but doesn't seem to work when it comes to the DateTimePicker box.

What could be the problem?

Thanks!

David

回答1:

No, that's for a ComboBox. The native DTP control is quite noddy. It supports the DTM_CLOSEMONTHCAL message to close the calendar but doesn't have a corresponding message to open it. You'll have to do something ugly like faking mouse or keyboard input. The latter is probably best:

Private Sub ShowMonthCalendar_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ShowMonthCalendar.Click
    DateTimePicker1.Focus()
    SendKeys.Send("{F4}")
End Sub

来源：https://stackoverflow.com/questions/5597880/vb-net-programmably-drop-down-the-datetimepicker