vb.net – 如何确定什么类型的对象是事件的发件人？

发布时间：2020-12-17 00:31:16 所属栏目：大数据来源：网络整理

导读：亲爱的我的子 Dim onThisTable as String ="Name"Private Sub skill_mouseHover(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles button1.MouseHover,button2.MouseHover,panel1.MouseHover,panel2.MouseHover,pbox1.MouseHover descri

亲爱的我的子

Dim onThisTable as String ="Name"

Private Sub skill_mouseHover(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles button1.MouseHover,button2.MouseHover,panel1.MouseHover,panel2.MouseHover,pbox1.MouseHover
  descriptionLabel.Text = dbClass.getDescription(sender.Text,onThisTable)
End Sub

现在,我希望根据用户传递的内容(面板或一个pbox或一个按钮)给onThisTable一个不同的值,但是我无法找到什么是正确的方式来比较它是什么类型的？

Private Sub skill_mouseHover(ByVal sender As System.Object,pbox1.MouseHover
  if sender is ( a button )
     onThisTable = "Admin"
  else if sender is ( a panel )
     onThisTable = "dbObject"
  else 
     onThisTable ="Name"
  end if

   descriptionLabel.Text = dbClass.getDescription(sender.Text,onThisTable)
End Sub

您可以在此处使用TypeOf关键字作为描述( link)

If TypeOf sender Is Button Then
        onThisTable = "Admin"
    ElseIf TypeOf sender Is System.Windows.Forms.Panel Then
        onThisTable = "dbObject"
    Else
        onThisTable = "Name"
    End If

（编辑：李大同）

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