vb.net新增事件的简单介绍

提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示

vb.net给控件加事件

两种方法：

1. 用WithEvents声明变量vb.net新增事件，这样vb.net新增事件你就可以像对待拖上去的控件一样操作：

Public Class Form3

WithEvents btn As New Button

Private Sub Form3_Load(sender As Object, e As EventArgs) Handles Me.Load

Controls.Add(btn)

End Sub

Private Sub btn_Click(sender As Object, e As EventArgs) Handles btn.Click

MsgBox(Now)

End Sub

End Class

2. 使用AddHandler 语句：

Public Class Form3

Private Sub Form3_Load(sender As Object, e As EventArgs) Handles Me.Load

Dim btn As New Button

AddHandler btn.Click, AddressOf btn_Click

Controls.Add(btn)

End Sub

Private Sub btn_Click(sender As Object, e As EventArgs)

MsgBox(Now)

End Sub

End Class

WithEvents (Visual Basic)：

AddHandler 语句：

相关问答

Q1: 如何在 vb.net 为动态生成的控件添加事件并传递数据

'把图片的声明放在外面，类里面过程外面，而且要用As，不然等会儿没法用

Dim myPicture As New System.Windows.Forms.PictureBox()

'动态生成的控件，加一行

Private Sub UserControl1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load

Me.Panel3.Controls.Add(myPicture)

myPicture.Size =New System.Drawing.Size(115, 160)

myPicture.TabStop =False

myPicture.Name ="p"

myPicture.Cursor = Cursors.Hand

AddHandler myPicture.Click, AddressOf mypic_Click '添加事件

AddHandler returnid, AddressOf idReturned '绑定事件和过程

End Sub

'再来个事件，放在声明的地方，就是类里面、过程外面

Private Event returnid(ByVal id As String) '这个事件可以传递值哦~

'普通的单击事件

Private Sub mypic_Click()

RaiseEvent returnid(myPicture.Name)

End Sub

'会传值的事件过程

Private Sub idReturned(ByVal id As String)

Dim bookInfo As New BookInfo

bookInfo.Show()

Me.Parent.Enabled = False

'用id变量做点什么吧

End Sub

如果要改事件的签名（参数一类的）的话，得重写控件。你可以这样自己弄一个事件。

Q2: 在VB.net中，怎么在类中添加事件

首先vb.net新增事件： textbox里没有显示vb.net新增事件，是因为SerialPort1和TextBox2不是同一线程创建vb.net新增事件的，需要跨线程操作。需要用到委托，这样才能显示出来。其次： vb.net新增事件我觉得用串口的接收数据事件更好一些。

Q3: vb.net动态菜单，如何添加事件？

动态生成的控件：

Private Sub UserControl1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load

Dim myPicture = New System.Windows.Forms.PictureBox()

Me.Panel3.Controls.Add(myPicture)

myPicture.Size = New System.Drawing.Size(115, 160)

myPicture.TabStop = False

myPicture.Name = "p"

myPicture.Cursor = Cursors.Hand

AddHandler myPicture.Click, AddressOf mypic_Click '添加事件

End Sub

处理事件的过程：