c# - 如何使用前端中的方法从代码后面添加 <li> 元素。

Question

我必须使用一种方法在里面添加一些

元素。我正在使用以下代码:

<ul id="testul" runat="server">
  <%# LoadModalForm(testul) %>
</ul>

代码隐藏:

 protected Control LoadModalForm(Control ulCtrl)
        {

            var li = new HtmlGenericControl("li");

            // creating link with href
            var lnk = new HyperLink { NavigateUrl = "#modal-editprofile" };

            lnk.Attributes.Add("data-toggle", "modal");
            lnk.Text = "Edit";
            li.Controls.Add(lnk);


            ulCtrl.Controls.Add(li);

            return ulCtrl;

        }

但是我遇到了异常:

Exception Details: System.Web.HttpException: The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.

详细信息:

[HttpException (0x80004005): The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.]
   System.Web.UI.ControlCollection.Add(Control child) +12283968

Answer 1

HTML:

<ul id="testul" runat="server">

</ul>

代码隐藏:

        protected void Page_Load(object sender, EventArgs e)
        {
            LoadModalForm(testul);
        }

        protected void LoadModalForm(Control ulCtrl)
        {

            var li = new HtmlGenericControl("li");

            // creating link with href
            var lnk = new HyperLink { NavigateUrl = "#modal-editprofile" };

            lnk.Attributes.Add("data-toggle", "modal");
            lnk.Text = "Edit";
            li.Controls.Add(lnk);


            ulCtrl.Controls.Add(li);
        }