ASP.NET有没有更好的办法找到其他的控制范围内的控制？ [英] ASP.NET Is there a better way to find controls that are within other controls?

问题描述

目前，我有一个ascx控件内部下拉。我需要从后面上的另一个ASCX是在同一页上的code之内发现它。它的值被用作一个参数，以一个ObjectDataSource上ASCX＃2。我目前正在使用这个难看的片片code的。它的工作原理，但我意识到，如果conrtol为了要改变或各种其他的东西，它不会是我在哪里期待。有没有人有任何意见，我应该如何正确地做这个？

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;
}

感谢和新年快乐！
〜CK在圣地亚哥

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

推荐答案

一般来说，我实施FindInPage，或当你​​有很多的控制发现的事，在这里你只想通过它控制递归的FindControl功能，它会递归下降控件树。

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.

如果它只是一个一次性的东西，考虑露出你的API中需要这样你就可以直接对其进行访问控制。

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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