VB.net 可编程下拉DateTimePicker

发布于 2024-10-31 02:54:56 字数 196 浏览 1 评论 0原文

嘿，我这里有这段代码：

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

这在组合框上运行良好，但在 DateTimePicker 框上似乎不起作用。

可能是什么问题？

谢谢！

大卫

原文

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

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淡水深流 2024-11-07 02:54:56

不，那是针对 ComboBox 的。原生 DTP 控件非常巧妙。它支持 DTM_CLOSEMONTHCAL 消息来关闭日历，但没有相应的消息来打开它。你必须做一些丑陋的事情，比如伪造鼠标或键盘输入。后者可能是最好的：

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

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

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