如何控制将在应用程序执行过程中自动创建的一些控件?
我的添加控制
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim NewCheckbox As CheckBox
For i As Integer = 2 To 14
NewCheckbox = New CheckBox
NewCheckbox.Size = New Drawing.Size(15, 14)
NewCheckbox.Location = New Point(98, 40)
NewCheckbox.Name = "cbcard" & i
Me.Controls.Add(NewCheckbox)
next
我的复选框控件添加,我举了一个创建复选框控件的例子,但它应该对任何形式的控件都有效,无论是文本框还是按钮。
如何检测这些未创建但将在执行过程中创建的控件?复选框名称将为cbcard1
、cbcard2
、cbcard3
,最多为14。
但我希望这是一个处理程序的形式,或者它可能应该与计时器一起工作。
Private Sub Checkbox_Changed(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Checkbox.Changed
If Checkbox.checked = true
MsgBox("")
End If
End Sub
您可以使用AddHandler
语法订阅事件。
For i As Integer = 2 To 14
NewCheckbox = New CheckBox
NewCheckbox.Size = New Drawing.Size(15, 14)
NewCheckbox.Location = New Point(98, 40)
NewCheckbox.Name = "cbcard" & i
Me.Controls.Add(NewCheckbox)
'subscribe to the CheckChanged event (as an example)
AddHandler NewCheckbox.CheckChanged, AddressOf Checkbox_Changed
Next
'all dynamically created checkboxes were subscribed to this event
Private Sub Checkbox_Changed(ByVal sender As System.Object, ByVal e As System.EventArgs)
'sender is the specific checkbox that was changed out of all subscribed checkboxes
Dim checkBox = DirectCast(sender, CheckBox)
If checkbox.checked = true Then MsgBox(checkBox.Name)
End Sub