ASP.NET 有没有更好的方法来查找其他控件中的控件？

发布于 2024-08-16 08:16:49 字数 424 浏览 2 评论 0原文

我目前在 ascx 控件中有一个下拉菜单。我需要从同一页面上的另一个 ascx 后面的代码中“找到”它。它的值用作 ascx #2 上 ObjectDataSource 的参数。我目前正在使用这段丑陋的代码。它有效，但我意识到如果控制顺序发生变化或发生其他各种事情，它就不会是我所期望的。有人对我应该如何正确地做到这一点有任何建议吗？

if(Page is ClaimBase)
{
  var p = Page as ClaimBase;
  var controls = p.Controls[0].Controls[3].Controls[2].Controls[7].Controls[0];
  var ddl = controls.FindControl("ddCovCert") as DropDownList;
}

谢谢，新年快乐！〜ck在圣地亚哥

原文

I currently have a dropdown inside an ascx control. I need to "find" it from within the code behind on another ascx that is on the same page. It's value is used as a param to an ObjectDataSource on ascx #2. I am currently using this ugly piece of code. It works but I realize if the conrtol order were to change or various other things, it wouldn't be where I am expecting. Does anyone have any advice how I should properly be doing this?

if(Page is ClaimBase)
{
  var p = Page as ClaimBase;
  var controls = p.Controls[0].Controls[3].Controls[2].Controls[7].Controls[0];
  var ddl = controls.FindControl("ddCovCert") as DropDownList;
}

Thanks and Happy New Year!!
~ck in San Diego

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心清如水 2024-08-23 08:16:49

通常，当您需要查找大量控件时，我会实现“FindInPage”或递归 FindControl 函数，您只需向其传递一个控件，它就会递归地沿控件树下降。

如果这只是一次性的事情，请考虑在 API 中公开所需的控件，以便您可以直接访问它。

public static Control DeepFindControl(Control c, string id)
{
   if (c.ID == id)
   { 
     return c;
   }
   if (c.HasControls)
   {
      Control temp;
      foreach (var subcontrol in c.Controls)
      {
          temp = DeepFindControl(subcontrol, id);
          if (temp != null)
          {
              return temp; 
          }
      }
   }
   return null;
}

Generally I implement a "FindInPage" or recursive FindControl function when you have lots of control finding to do, where you would just pass it a control and it would recursively descend the control tree.

If it's just a one-off thing, consider exposing the control you need in your API so you can access it directly.

public static Control DeepFindControl(Control c, string id)
{
   if (c.ID == id)
   { 
     return c;
   }
   if (c.HasControls)
   {
      Control temp;
      foreach (var subcontrol in c.Controls)
      {
          temp = DeepFindControl(subcontrol, id);
          if (temp != null)
          {
              return temp; 
          }
      }
   }
   return null;
}

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