如何在动态按钮 - VB.net上创建动态按钮点击事件 [英] How can i create dynamic button click event on dynamic button - VB.net

问题描述

我正在页面上动态创建一个按钮。现在我想在该按钮上使用按钮点击事件。我如何在VB.net和asp.net？

我的代码：

 受保护的子Page_Load（发件人作为对象，e作为EventArgs）处理Me.Load 
尝试
 LoadControls（）
 Catch ex As Exception 
 
结束尝试
 End Sub 
  

加载控件

  Private Sub LoadControls（）
尝试
 Dim ButtonTable As New HtmlTable 
 Dim ButtonTableRow As New HtmlTableRow 
 Dim ButtonTableCell As New HtmlTableCell 
 Dim btnCode As New Button 
 btnCode.ID =btnCode
 btnCode.Text =btnCode
 AddHandler btnCode.Click，AddressOf btnCode_Click 
 ButtonTableCell.Controls.Add（btnCode）
 
 ButtonTableRow.Cells.Add（ButtonTableCell）
 ButtonTable.Rows.Add（ButtonTableRow）
 
控制sPlaceHolder.Controls.Add（ButtonTable）
 Catch ex As Exception 
 
结束尝试
 End Sub 
  

事件处理程序

  Private Sub btnCode_Click对象，e作为EventArgs）
 
 Dim buttonId作为新按钮
尝试
 buttonId = DirectCast（sender，Button）
 
 //我的执行
 Catch ex As Exception 
 
 End尝试
 End Sub 
  

问题：

事件处理程序不出现..它发出错误

找到具有相同ID的多个控件

这个代码有什么问题.. !!

解决方案

创建动态按钮订阅您的事件处理者

  AddHandler btnCode.Click，AddressOf btnCode_Click 
  

然后 EventHandler 必须至少为受保护，但您是私人 - 无法访问

I am creating a button on page dynamically. now i want to use button click event on that button. How can i do this in VB.net & asp.net?

My code:

Page Load:

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
            Try
               LoadControls()
             Catch ex As Exception

            End Try
        End Sub

Load Controls

   Private Sub LoadControls()
    Try
       Dim ButtonTable As New HtmlTable
       Dim ButtonTableRow As New HtmlTableRow
       Dim ButtonTableCell As New HtmlTableCell
       Dim btnCode As New Button
           btnCode.ID = "btnCode"
           btnCode.Text = "btnCode"
           AddHandler btnCode.Click, AddressOf btnCode_Click
       ButtonTableCell.Controls.Add(btnCode)

       ButtonTableRow.Cells.Add(ButtonTableCell)
       ButtonTable.Rows.Add(ButtonTableRow)

       ControlsPlaceHolder.Controls.Add(ButtonTable)
 Catch ex As Exception

        End Try
    End Sub

Event Handler

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

            Dim buttonId As New Button
            Try
                buttonId = DirectCast(sender, Button)

                // My execution
            Catch ex As Exception

            End Try
        End Sub

Problem:

event handler doesn't arises..!! it throws an error

Multiple controls with the same ID were found

What is wrong with this code..!!

解决方案

After creating a dynamic button "subscribe" your eventhandler btnCode_Click to event of the button:

AddHandler btnCode.Click, AddressOf btnCode_Click

Then EventHandler must be at least Protected, but your is Private - it cannot be accessed then

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