如何将事件添加到通过单击按钮 VB.NET 动态创建的 PictureBox

Question

使用文本框添加我动态创建的数字，例如表单中的 5 个图片框，如下所示：

Sub CreateImages()
    Dim pb As New PictureBox
    Dim i As Integer = TextBoxNumberImages.Text
    Dim Z As Integer = 10

    pb.Top = 50
    pb.Left = 50
    pb.Tag = Color.Black
    pb.BackColor = Color.Red

    For i = 1 To i
        pb = New PictureBox
        pb.Width = 120
        pb.Height = 330
        pb.Left += Z
        pb.Tag = False
        pb.Name = "Image" + Str(i)
        pb.BorderStyle = BorderStyle.FixedSingle

        pb.BackColor = Color.Green
        AddHandler pb.Click, AddressOf _Click

        Me.Controls.Add(pb)
        pb.Refresh()
        Z += 125
    Next
End Sub

然后，在创建图片框后单击每个...使用 AddHandler pb.Click, AddressOf _Click 我获得了焦点和 3 个按钮来处理当前图片框（只需增加/减少或切成两部分）使用此代码:

Public Sub _Click(ByVal sender As Object, ByVal e As EventArgs)
    Dim pb As PictureBox = DirectCast(sender, PictureBox)
    Dim selected As Boolean = DirectCast(pb.Tag, Boolean)

         
    Dim d As Integer
    For d = 1 To TextBoxNumberImages.Text
        If pb.Name = "Image" + Str(d) Then
            NOMEPIC = pb.Name
            pb.BackColor = Color.Blue
            '   MsgBox(pb.Location.X & "X")
            '   MsgBox(pb.Location.Y & "Y")
            BtnAdd.Top = pb.Location.Y + 330
            BtnAdd.Left = pb.Location.X
            BtnSub.Top = pb.Location.Y + 330
            BtnSub.Left = pb.Location.X + 40
            BtnNew.Top = pb.Location.Y + 330
            BtnNew.Left = pb.Location.X + 80
            Label1.Top = pb.Location.Y + 360
            Label1.Left = pb.Location.X
            Label1.Text = "Art. " & d
            txtArt.Top = pb.Location.Y + 380
            txtArt.Left = pb.Location.X
        End If
    Next
    BtnAdd.Visible = True
    BtnSub.Visible = True
    BtnNew.Visible = True
    Label1.Visible = True
    txtArt.Visible = True
    pb.Refresh()

现在我想通过 3 个按钮来管理它们（“+”增大尺寸“-”减小尺寸 e 切割...）但我不知道如何让图片框聚焦（涉及）。

Answer 1

只需保留对上次单击的 PictureBox 的引用，然后在按钮处理程序中对其进行操作

Private selectedPictureBox As PictureBox

Private Sub _Click(sender As Object, e As EventArgs)
    selectedPictureBox = DirectCast(sender, PictureBox)
    ' ...
End Sub

Private Sub btnAdd_Click(sender As Object, e As EventArgs) Handles btnAdd.Click
    If selectedPictureBox Is Nothing Then Exit Sub
    selectedPictureBox.Width += 1
    selectedPictureBox.Height += 1
End Sub

Private Sub btnSub_Click(sender As Object, e As EventArgs) Handles btnSub.Click
    If selectedPictureBox Is Nothing Then Exit Sub
    selectedPictureBox.Width -= 1
    selectedPictureBox.Height -= 1
End Sub

如何将事件添加到通过单击按钮 VB.NET 动态创建的 PictureBox

How can I add events to a PictureBox dynamically created by clicking button VB.NET

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