在VB.net中获取DateTimePicker的月份点击

Question

如何查看 DateTimePicker 的月份箭头点击事件。当我尝试更改 datetimepicker 的月份时，它会给出下个月的第一个日期，所以我必须阻止该月的点击。

请看图片：

非常感谢。

Answer 1

混合使用 CloseUp 和 DropDown 事件和绑定数据可能是解决方案

Imports System.Windows.Forms

Namespace WindowsFormsApplication1
    Public Partial Class Form1
        Inherits Form
        Private isDropedDown As Boolean
        Private m_dataSale As DateTime = DateTime.Now
        Public Property DataSale() As DateTime
            Get
                Return m_dataSale
            End Get
            Set
                If isDropedDown Then
                    If m_dataSale.[Date].AddMonths(1).[Date] = value.[Date] OrElse m_dataSale.[Date].AddMonths(-1).[Date] = value.[Date] OrElse New DateTime(m_dataSale.Year, m_dataSale.Month, 1).AddMonths(1).[Date] = value.[Date] OrElse New DateTime(m_dataSale.Year, m_dataSale.Month, 1).AddMonths(-1).[Date] = value.[Date] Then
                        MessageBox.Show("Month is changing")
                    End If
                End If

                m_dataSale = value
            End Set
        End Property

        Public Sub New()
            InitializeComponent()
            Dim binding = dateTimePicker1.DataBindings.Add("Value", Me, "DataSale")
            binding.DataSourceUpdateMode = DataSourceUpdateMode.OnPropertyChanged
        End Sub
        Private Sub dateTimePicker1_CloseUp(sender As Object, e As EventArgs)
            isDropedDown = False
        End Sub

        Private Sub dateTimePicker1_DropDown(sender As Object, e As EventArgs)
            isDropedDown = True
        End Sub
    End Class
End Namespace