查找类控制 - 找不到控制 [英] Find control in class -- cannot find control

问题描述

我有一个ajax标签容器的aspx页面。在一类，我想找到的选项卡容器传递一些值。

I have an aspx page with an ajax tab container. In a class I want to find the tab container to pass some values.

我定义 MYPAGE ：

Page myPage = (Page)HttpContext.Current.Handler;

当在这个 MYPAGE 详细信息寻求通过点击添加观察它上市，我在寻找标签的容器。然而，当我定义我的选项卡容器

When looking in more details on this myPage by clicking add watch it is listing the tab container I am looking for. However when I define my tab container

AjaxControlToolkit.TabContainer Workflow_TabContainer = null;
Workflow_TabContainer = 
         (AjaxControlToolkit.TabContainer)myPage.FindControl("Workflow_TabContainer")
         as AjaxControlToolkit.TabContainer;

或

AjaxControlToolkit.TabContainer Workflow_TabContainer 
        (AjaxControlToolkit.TabContainer)myPage.FindControl("Workflow_TabContainer");

它没有找到的标签的容器。我也试图首先定义页，比的ContentPlaceHolder和搜索的占位符标签的容器。同样的问题。

it does not find the tab container. I also tried to first define the page, than the ContentPlaceholder and searched for the tab container in the place holder. Same issue.

任何帮助和/或提示是多少AP preciated。

Any help and/or hint is much appreciated.

感谢

推荐答案

的的FindControl 方法仅会在当前控制儿童。

The FindControl method only looks in the current control for children.

如果你不知道在页面层次结构中的控件，你需要做一个递归搜索 - 这很可能是，如果你使用的是模板化控件，如 TabContainer的。

If you don't know where in the page hierarchy the controls are, you'll need to do a recursive search - which is likely if you're using a templated control such as the TabContainer.

由于我已为previously到<一个href=\"http://stackoverflow.com/questions/6525804/using-findcontrol-to-get-gridview-in-a-content-page/6527866#6527866\">similar回答：

As I've posted previously to a similar answer:

private Control FindControlRecursive(Control rootControl, string controlID)
{
  if (rootControl.ID == controlID) {
    return rootControl;
  }

  foreach (Control controlToSearch in rootControl.Controls)
  {
    Control controlToReturn = 
      FindControlRecursive(controlToSearch, controlID);
    if (controlToReturn != null) { 
      return controlToReturn;
    }
  }

  return null;
}

一旦你得到了你的控制，你应该使用它转换为，然后就在这不是很是你所期待的情况下检查空：

Once you've got your control, you should cast it using as and then check for null just in case it's not quite what you were expecting:

var tabContainer = FindControlRecursively(myPage, "Workflow_TabContainer")
                 as AjaxControlToolkit.TabContainer

if (null != tabContainer) {
  // Do Stuff
}

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