asp.net动态按钮与事件处理程序 [英] asp.net dynamically button with event handler

问题描述

我在这里有一个小问题，一个动态生成的按钮和他们的事件处理程序在asp.net。我为特殊用户生成一个带有其他按钮的灵活表格。按钮将动态生成，工作正常。但是我不能让事件处理程序正常工作。

这里有一些代码：
构建按钮（在自己的函数中） / p>

  ... 
按钮ButtonChange = new Button（）; 
 
 ButtonChange.Text =更改; 
 ButtonChange.ID =change_+ i.ToString（）; 
 ButtonChange.Font.Size = FontUnit.Point（7）; 
 ButtonChange.ControlStyle.CssClass =button; 
 ButtonChange.Click + = new EventHandler（test）; 
 ... 
  

和

  void test（object sender，EventArgs e）
 {
 //做一些东西
} 
  pre> 
 
 
我的 Page_Load 为空。
 
 
 
但是程序不会跳转到测试中，如果我点击按钮。发生什么事？
 
 
 
 编辑!!!  
问题是，我不知道在开始有多少行我得到从我的sql查询回来。对于每一行，我将添加一个删除和更改按钮。 
我在程序中调用一个方法，它将结果构建为一个表。 
在这个方法中，我检查当前用户是否是AdminUser，如果他是，我将调用buildAdminButtons函数。 
这里，我为每一行创建一个新列中的按钮。如何在OnLoad中获得这个？
  private void buildAdminButtons（TableRow tempRow，int i）
 {
按钮ButtonDelete = new Button（）; 
按钮ButtonChange = new Button（）; 
 
 TableCell change = new TableCell（）; 
 TableCell delete = new TableCell（）; 
 
 ButtonChange.Text =更改; 
 ButtonChange.ID =change_+ i.ToString（）; 
 ButtonChange.Font.Size = FontUnit.Point（7）; 
 ButtonChange.ControlStyle.CssClass =button; 
 
 
 ButtonDelete.Text =删除; 
 ButtonDelete.ID =delete_+ i.ToString（）; 
 ButtonDelete.Font.Size = FontUnit.Point（7）; 
 ButtonDelete.ControlStyle.CssClass =button; 
 
 change.Controls.Add（ButtonChange）; 
 delete.Controls.Add（ButtonDelete）; 
 
 tempRow.Cells.Add（更改）; 
 tempRow.Cells.Add（delete）; 
} 
  
我添加到每个按钮一个唯一的ID，我不知道开始。如何处理？
解决方案
您必须将   c> page_load 或 page_init 事件。 
  protected void Page_Load（）
 {
 Button ButtonChange = new Button（）; 
 
 ButtonChange.Text =更改; 
 ButtonChange.ID =change_+ i.ToString（）; 
 ButtonChange.Font.Size = FontUnit.Point（7）; 
 ButtonChange.ControlStyle.CssClass =button; 
 ButtonChange.Click + = new EventHandler（test）; 
} 
  
阅读MSDN文章 -  如何以编程方式将控件添加到ASP.NET网页？ 
 
I have here a small problem with a dynamically generated buttons and their event handler in asp.net. I generate a flexible table with additional Buttons for special users. The buttons will generate dynamically, which works fine. But I can’t get the event handler to work.

Here are some pieces from my code:
Build the button (In an own function).
…
Button ButtonChange = new Button();

ButtonChange.Text = "Change";
ButtonChange.ID = "change_" + i.ToString();
ButtonChange.Font.Size = FontUnit.Point(7);
ButtonChange.ControlStyle.CssClass = "button";
ButtonChange.Click += new EventHandler(test);
…
And 
void test(object sender, EventArgs e)
{ 
   // Do some stuff       
}
My Page_Load is empty.

But the program won’t jump to test, if I click the button. What’s going wrong?

Edit!!!
The problem is that I don’t know at start how many rows I get from my sql query back. For every row I will add a delete and a change button.
I call in my program a method which builds the result as a table.
In this method, I check if the current user is an AdminUser and if he is, I will call buildAdminButtons function.
Here, I create the buttons in a new column, for every row. How could I get this in OnLoad?
private void buildAdminButtons(TableRow tempRow, int i)
{
    Button ButtonDelete = new Button();
    Button ButtonChange = new Button();

    TableCell change = new TableCell();
    TableCell delete = new TableCell();

    ButtonChange.Text = "Change";
    ButtonChange.ID = "change_" + i.ToString();
    ButtonChange.Font.Size = FontUnit.Point(7);
    ButtonChange.ControlStyle.CssClass = "button";


    ButtonDelete.Text = "Delete";
    ButtonDelete.ID = "delete_" + i.ToString();
    ButtonDelete.Font.Size = FontUnit.Point(7);
    ButtonDelete.ControlStyle.CssClass = "button";

    change.Controls.Add(ButtonChange);
    delete.Controls.Add(ButtonDelete);

    tempRow.Cells.Add(change);
    tempRow.Cells.Add(delete);
}
I add to every button a unique id, which I don't know at the start. How could I handle this?
解决方案
You must have to place that code in page_load or page_init  event. 
protected void Page_Load()
{
  Button ButtonChange = new Button();

  ButtonChange.Text = "Change";
  ButtonChange.ID = "change_" + i.ToString();
  ButtonChange.Font.Size = FontUnit.Point(7);
  ButtonChange.ControlStyle.CssClass = "button";
  ButtonChange.Click += new EventHandler(test);
}
Read MSDN article - How to: Add Controls to an ASP.NET Web Page Programmatically?

                        
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