如何触发按钮事件的单击事件，该事件是动态添加到asp.net中的stringbuilder的? [英] how to fire click event for button control which is dymaically added to stringbuilder in asp.net?

问题描述

public partial class Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
           
    }
    void exit(object sender,EventArgs e)
    {
        Response.Write("exit");
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Button b = new Button();
        b.Click += new EventHandler(exit);
        b.Text = "click";
        StringBuilder sb = new StringBuilder();
        StringWriter sw = new StringWriter(sb);
        HtmlTextWriter ht = new HtmlTextWriter(sw);
        b.RenderControl(ht);
        Response.Write("<br>" + sb);
    }
}

在这里，我无法调用按钮的单击事件，如何实现此

here i am unable call click event of button,how to achieve this

推荐答案

您不能在另一个控件的事件处理程序中动态添加控件，在Page_Load中添加任何动态控件.
要了解引发的事件以及以什么顺序发生的事件，请查看此 [ ^ ].
因此，这意味着您需要在Page_Load中添加控件，并使用Button1的事件处理程序使第二个按钮可见.

像这样；

You can''t dynamically add controls in the event handler of another control, you have to add any dynamic controls in Page_Load.
To understand the events that fire and in which order have a look at this[^].
So, what this means is you need to add the control in the Page_Load and use the event handler for Button1 to make the second button visible.

Like so;

public partial class _Default : System.Web.UI.Page
   {
      private Button b = new Button();
      protected void Page_Load(object sender, EventArgs e)
      {
         if (Page.IsPostBack == true)
         {
            b.Click += new EventHandler(b_Click);
            b.Text = "click";
            b.ID = "button2";
            b.Visible = false;
            Page.Form.Controls.Add(b);
         }
      }
      protected void Button1_Click(object sender, EventArgs e)
      {
         b.Visible = true;
      }
      void b_Click(object sender, EventArgs e)
      {
         Response.Clear();
         Response.Write("exit");
         Response.Flush();
         Response.End();
      }
   }

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