当 RenderControl ascx 在 RenderBeginTag 中覆盖面板时无法 FindControl

发布于 2024-12-08 13:57:35 字数 845 浏览 0 评论 0原文

我正在使用 Panel 控件创建一个容器，如下所示：

public class CustomContainer : Panel
{
 public override void RenderBeginTag(HtmlTextWriter writer)
 {
  var control this.Page.LoadControl("web user control path.ascx");
  control.ID = "userControlId";
  control.RenderControl(writer);
  base.RenderBeginTag(writer);
 }
 public void ShowMessage(string message)
 {
  var control = this.FindControl("userControlId"); // control here is null!!
  var custom = control as CustomControl;
  custom.Message = message;
 }
}

当我尝试查找我呈现的 id userControlId 的控件时，它总是返回 null！有谁知道发生了什么事？我该如何解决这个问题？

顺便说一句：我无法在 CreateChildControls 方法中添加 CustomControl，因为如果 CustomContainer 有代码块，我就会遇到异常！

无法修改 Controls 集合，因为该控件包含代码块（即 <% ... %>）。

原文

I'm creating a container using Panel control as follows:

public class CustomContainer : Panel
{
 public override void RenderBeginTag(HtmlTextWriter writer)
 {
  var control this.Page.LoadControl("web user control path.ascx");
  control.ID = "userControlId";
  control.RenderControl(writer);
  base.RenderBeginTag(writer);
 }
 public void ShowMessage(string message)
 {
  var control = this.FindControl("userControlId"); // control here is null!!
  var custom = control as CustomControl;
  custom.Message = message;
 }
}

when I try to find the control with id userControlId which I rendered, it always retuns null!
Does anyone know what's happening? How can I solve this issue?

BTW: I can't add the CustomControl in CreateChildControls method because if the CustomContainer has code block I got an exception!