vb.net - 在日期选择器中浏览月份时如何不触发 datepicker.valuechanged 事件

Question

我正在使用vb.net。我添加一个日期选择器如下

Friend WithEvents dtpReportDate As System.Windows.Forms.DateTimePicker

默认的日期选择器有向左箭头和向右箭头，允许您浏览上个月和下个月。我向日期选择器 valuechanged 事件添加一个处理程序:

AddHandler dtpReportDate.ValueChanged, AddressOf dtpReportDateChanged

Private Sub dtpReportDateChanged(ByVal 发送者作为对象，ByVal e 作为 System.EventArgs)

'在这里做点什么

结束子

问题是，每当我单击向左箭头或向右箭头更改月份时，都会触发 dptReportDateChanged。我不希望这种情况发生。我想要的只是找到一个月后，双击日期来触发事件。

非常感谢!

Answer 1

试试这个:

Private Sub DateTimePicker1_ValueChanged(ByVal sender As Object, ByVal e As EventArgs) Handles DateTimePicker1.ValueChanged
  Me.Text = DateTimePicker1.Value.ToString
End Sub

Private Sub DateTimePicker1_DropDown(ByVal sender As Object, ByVal e As EventArgs) Handles DateTimePicker1.DropDown
  RemoveHandler DateTimePicker1.ValueChanged, AddressOf DateTimePicker1_ValueChanged
End Sub

Private Sub DateTimePicker1_CloseUp(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DateTimePicker1.CloseUp
  AddHandler DateTimePicker1.ValueChanged, AddressOf DateTimePicker1_ValueChanged
  Call DateTimePicker1_ValueChanged(sender, EventArgs.Empty)
End Sub