Question

AM尝试为表单上的某些控件捕获特定事件。我试过这个，但它没有激发事件

 For Each ctrl As Control In pnlGeneral.Controls
            If TypeOf ctrl Is CheckBox Then
                AddHandler (DirectCast(ctrl, CheckBox).CheckedChanged), AddressOf Control_Changed
            ElseIf TypeOf ctrl Is TextBox Then
                AddHandler (ctrl.TextChanged), AddressOf Control_Changed
            ElseIf TypeOf ctrl Is NumericUpDown Then
                AddHandler (DirectCast(ctrl, NumericUpDown).ValueChanged), AddressOf Control_Changed
            End If

        Next

任何人都可以帮我解决这个问题吗？

修改

我发现将控件置于多个控件中，在窗体上是一个面板，面板内部是不同的groupbox，这些组框有控件我试图捕获他们的事件

Answer 1

因为Lars说它似乎确实有效。

根据容器中的控件进行了编辑

Private Sub Form1_Shown(sender As Object, e As System.EventArgs) Handles Me.Shown
    Dim ctrl As Control = Me.GetNextControl(Me, True)
    Do Until ctrl Is Nothing
        If TypeOf ctrl Is CheckBox Then
            AddHandler (DirectCast(ctrl, CheckBox).CheckedChanged), AddressOf Control_Changed
        ElseIf TypeOf ctrl Is TextBox Then
            AddHandler (ctrl.TextChanged), AddressOf Control_Changed
        ElseIf TypeOf ctrl Is NumericUpDown Then
            AddHandler (DirectCast(ctrl, NumericUpDown).ValueChanged), AddressOf Control_Changed
        End If
        ctrl = Me.GetNextControl(ctrl, True)
    Loop
End Sub

Private Sub Control_Changed(sender As System.Object, e As System.EventArgs)
    Debug.WriteLine(sender.ToString)
End Sub

Answer 2

Private Sub Form_Activate(Byval sender As Object,Byval e as System.EventArgs) Handles Form.Activate

    Dim Ctrl as System.Windows.Forms.Control

    For Each Ctrl in Me.Controls
    If Typeof Ctrl Is System.Windows.Forms.TextBox then
    AddHandler Ctrl.GotFocus, AddressOf TextFocus
    AddHandler Ctrl.LostFocus, AddressOf TextUnfocus
    Next
End Sub

Private Sub TextFocus(ByVal sender As Object, ByVal e As System.EventArgs)
    CType(sender,System.Windows.Forms.TextBox).BackColor = Color.Blue
End Sub

Private Sub TextUnfocus(ByVal sender As Object, ByVal e As System.EventArgs)
    CType(sender, System.Windows.Forms.TextBox).BackColor = Color.White
End Sub

多个控件vb.net的事件处理程序

2 个答案: