更改asp.net中服务器控件的ID

发布于 2024-08-11 23:59:41 字数 199 浏览 6 评论 0原文

大家好，

我使用 find 控件从内容页面中查找母版页内无序列表的列表项，

Control home = this.Page.Master.FindControl("list").FindControl("home");

现在我必须将控件主页的 id 更改为“当前”，因为要为其应用 css... 。

原文

Hai guys,

I used find control to find a list item of an unoreder list inside a master page from content page using this,

Control home = this.Page.Master.FindControl("list").FindControl("home");

Now i have to change the id of the control home to "current" because to apply css for it....

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迷鸟归林 2024-08-18 23:59:41

您知道您正在查找的控件的类型吗？既不是 Control 也不是 ListItem 公开 CssClass 属性，但是，ListItem 确实公开它是 Attributes 属性。

根据评论和其他问题：

您应该使用System.Web.UI.HtmlControls.HtmlGenericControl

所以像这样的东西应该适合您：

HtmlGenericControl home = 
                    this.Page.Master.FindControl("list").FindControl("home")
                                                         as HtmlGenericControl;

string cssToApply = "active_navigation";

if (null != home) {
  home.Attributes.Add("class", cssToApply);
}

如果您认为有可能已经是分配给它的类，您需要附加到您可以执行以下操作：

if (null != home) {
  if (home.Attributes.ContainsKey("class")) {
    if (!home.Attributes["class"].Contains(cssToApply)){
      // If there's already a class attribute, and it doesn't already
      // contain the class we want to add:
      home.Attributes["class"] += " " + cssToApply;
    }
  }
  else {
    // Just add the new class
    home.Attributes.Add("class", cssToApply);
  }
}

如果它们不是 ListItems，请将它们转换为正确的类型，然后像以前一样修改属性集合，除非该类型有 CssClass 属性。

Do you know the Type of the control you're finding? Neither Control nor ListItem expose a CssClass property, however, ListItem does expose it's Attributes property.

Update based on comment and other question:

You should be using System.Web.UI.HtmlControls.HtmlGenericControl

So something like this should work for you:

HtmlGenericControl home = 
                    this.Page.Master.FindControl("list").FindControl("home")
                                                         as HtmlGenericControl;

string cssToApply = "active_navigation";

if (null != home) {
  home.Attributes.Add("class", cssToApply);
}

If you think there might already be an class assigned to it that you need to append to you could do something like:

if (null != home) {
  if (home.Attributes.ContainsKey("class")) {
    if (!home.Attributes["class"].Contains(cssToApply)){
      // If there's already a class attribute, and it doesn't already
      // contain the class we want to add:
      home.Attributes["class"] += " " + cssToApply;
    }
  }
  else {
    // Just add the new class
    home.Attributes.Add("class", cssToApply);
  }
}

If they aren't ListItems, cast them to the correct type, and modify the attributes collection as before, unless there's a CssClass property for that type.

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