处理asp.net中动态创建的控件的事件 [英] Handling events of dynamically created controls in asp.net

问题描述

我有没有动态创建一个按钮。当我点击该按钮，在一个文本框的行数进行计数。我存储在一个名为计数的变量。根据计值我在面板上创建按钮。

到现在为止它正常工作。

现在这些按钮的点击事件不会开火。

我曾尝试谷歌我的问题。但无论我得到了同样的答案。创建 Page_Init 事件的控件。但是，怎么可能？我从一个文本文件的线条让计的价值，并计数该值决定多少个按钮在面板中创建。

 昏暗btnAllow作为新按钮
btnAllow.Text =允许
btnAllow.ID =BTA与＆amp; X
AddHandler的btnAllow.Click，AddressOf btnAllow_ClickbtnAllowList.Add（btnAllow）tdAllow.Controls.Add（btnAllow）
 

在code为btnAllow_Click

 保护小组btnAllow_Click（BYVAL发件人为对象，BYVAL E上System.EventArgs）
   当x为整数= 0〜btnAllowList.Count  -  1
      如果sender.ID.SubString（3）= btnAllowList（x）的.ID.Substring（3）然后
         昏暗lineCount = IO.File.ReadAllLines（PendingRequestsPath）。长度
         昏暗的读者作为新就是System.IO.StreamReader（DocumentViewersPath）
         昏暗allLines作为新的列表（串）
         这样做虽然不reader.EndOfStream
            allLines.Add（reader.ReadLine（））
         循环
         reader.Close（）
         昏暗DocumentViewerAlreadyExists由于布尔= FALSE
         对于我作为整数= 0〜lineCount  -  1
            如果的ReadLine（I，allLines）= lblRequestorsList（X）。文本然后
               DocumentViewerAlreadyExists = TRUE
               对于出口
            万一
         下一个
         如果DocumentViewerAlreadyExists = false，那么
            昏暗的作家作为System.IO.StreamWriter = IO.File.AppendText（DocumentViewersPath）
            Writer.WriteLine（lblRequestorsList（X）。文本）
         万一
         昏暗的行作为字符串=
         昏暗 -  [R作为IO.StreamReader = IO.File.OpenText（PendingRequestsPath）
         昏暗strFile作为新的ArrayList
         虽然r.Peek＆LT;＆GT; -1遍历文件
            行= r.ReadLine'读取下一个可用行
            '检查，看看是否行包含您要查找的内容。
            如果没有，将它添加到一个ArrayList
            如果不line.Contains（lblRequestorsList（X）。文本）然后
               strFile.Add（线）
            万一
            r.Close（）
            因为我们要，我们首先替换文件的内容
            需要将其删除。
            如果IO.File.Exists（PendingRequestsPath）然后
               IO.File.Delete（PendingRequestsPath）
            万一
            '创建具有相同文件名的StreamWriter对象
            昏暗objWriter作为新IO.StreamWriter（PendingRequestsPath，真）
            通过ArrayList的迭代
            对于每个项目的ArrayList在strFile
               objWriter.WriteLine（项目）ArrayList中的文件写入当前项目。
            下一个
            objWriter.Flush（）
            objWriter.Close（）
         虽然结束
      万一
   下一个
结束小组
 

解决方案

这为我工作：

 保护小组的button1_Click（发送者为对象，E作为System.EventArgs）把手Button1.Click
    昏暗NumberOfControls为整数= 10
    会议（CreateControls）= NumberOfControls
结束小组保护小组btnAllow_Click（BYVAL发件人为对象，BYVAL E上System.EventArgs）
    这将在新创建的按钮点击时被执行。
结束小组保护小组的Page_Load（发送者为对象，E作为System.EventArgs）把手Me.Load
    如果会议（CreateControls）状态并没有任何再
        当x为整数= 0〜Convert.ToInt32（会话（CreateControls））
            昏暗btnAllow作为新按钮
            btnAllow.Text =允许
            btnAllow.ID =BTA与＆amp; X
            AddHandler的btnAllow.Click，AddressOf btnAllow_Click            Panel1.Controls.Add（btnAllow）
        下一个
    万一
结束小组
 

I have a button which is not created dynamically. When I click on that button the number of lines in a textbox are counted. I store that in the variable called count. Depending on value of count I create buttons in panel.

Up to now it is working properly.

Now the click event of those buttons is not firing.

I have tried to google my question. But everywhere I got the same answer. Create the controls in Page_Init event. But how is it possible? I am getting the value of count from a textfile's lines, and that value of count decides how many button will be created in the panel.

Dim btnAllow As New Button
btnAllow.Text = "Allow"
btnAllow.ID = "btA" & x
AddHandler btnAllow.Click, AddressOf btnAllow_Click

btnAllowList.Add(btnAllow)

tdAllow.Controls.Add(btnAllow)

The code for btnAllow_Click

Protected Sub btnAllow_Click(ByVal sender As Object, ByVal e As System.EventArgs)
   For x As Integer = 0 To btnAllowList.Count - 1
      If sender.ID.SubString(3) = btnAllowList(x).ID.Substring(3) Then
         Dim lineCount = IO.File.ReadAllLines(PendingRequestsPath).Length
         Dim reader As New System.IO.StreamReader(DocumentViewersPath)
         Dim allLines As New List(Of String)
         Do While Not reader.EndOfStream
            allLines.Add(reader.ReadLine())
         Loop
         reader.Close()
         Dim DocumentViewerAlreadyExists As Boolean = False
         For i As Integer = 0 To lineCount - 1
            If ReadLine(i, allLines) = lblRequestorsList(x).Text Then
               DocumentViewerAlreadyExists = True
               Exit For
            End If
         Next
         If DocumentViewerAlreadyExists = False Then
            Dim Writer As System.IO.StreamWriter = IO.File.AppendText(DocumentViewersPath)
            Writer.WriteLine(lblRequestorsList(x).Text)
         End If
         Dim line As String = ""
         Dim r As IO.StreamReader = IO.File.OpenText(PendingRequestsPath)
         Dim strFile As New ArrayList
         While r.Peek <> -1  ' Loop through the file
            line = r.ReadLine 'Read the next available line
            ' Check to see if the line contains what you're looking for.
            ' If not, add it to an ArrayList
            If Not line.Contains(lblRequestorsList(x).Text) Then
               strFile.Add(line)
            End If
            r.Close()
            ' Because we want to replace the content of the file, we first
            ' need to delete it.
            If IO.File.Exists(PendingRequestsPath) Then
               IO.File.Delete(PendingRequestsPath)
            End If
            ' Create a StreamWriter object with the same filename
            Dim objWriter As New IO.StreamWriter(PendingRequestsPath, True)
            ' Iterate through the ArrayList
            For Each item As ArrayList In strFile
               objWriter.WriteLine(item) ' Write the current item in the ArrayList to the file.
            Next
            objWriter.Flush()
            objWriter.Close()
         End While
      End If
   Next
End Sub

解决方案

This worked for me:

Protected Sub Button1_Click(sender As Object, e As System.EventArgs) Handles Button1.Click
    Dim NumberOfControls As Integer = 10
    Session("CreateControls") = NumberOfControls
End Sub

Protected Sub btnAllow_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    'This will be executed when clicking on the newly created buttons.
End Sub

Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load
    If Session("CreateControls") IsNot Nothing Then
        For x As Integer = 0 To Convert.ToInt32(Session("CreateControls"))
            Dim btnAllow As New Button
            btnAllow.Text = "Allow"
            btnAllow.ID = "btA" & x
            AddHandler btnAllow.Click, AddressOf btnAllow_Click

            Panel1.Controls.Add(btnAllow)
        Next
    End If
End Sub

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