如何遍历控件以获取特定类型的控件? [英] How to loop through controls to get specific type of controls?

问题描述

我有一个像这样的div:

I have a div like this:

<div id="columns" runat="server">
       <ul id="column1" class="column" >
        <!-- /////////////// -->
        </ul>
        <ul id="column2" class="column" runat="server">
        </ul>
        <ul id="column3" class="column" runat="server">
        </ul>
        <ul id="column4" class="column" runat="server">
            <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
        </ul>
    </div>

---

在运行时，我在(ul具有属性runat ="server")中创建 listitems(HtmlGenericControl outer_li = new HtmlGenericControl("li");).

---

In run time I create listitems(HtmlGenericControl outer_li = new HtmlGenericControl("li");) in the (ul which has attribute runat ="server").

现在我想做的是: 遍历div id="columns"以获得每个(具有属性runat ="server"的ul)，然后遍历每个(ul)以获得每个列表项以保存内容.

Now what i wanna to do is: looping through div id="columns" to get each (ul which has attribute runat ="server") then loop through each (ul) to get each list item to save contents .

foreach (Control c in columns.Controls.OfType<HtmlGenericControl>())
        {
            var ctrl = (HtmlGenericControl)c;

            if (ctrl.TagName == "ul" && ctrl.ID != "column1")
            {
                foreach (Control li in ctrl.Controls.OfType<HtmlGenericControl>())
                {

                    var ctrl_li = (HtmlGenericControl)li;
                    if (ctrl_li.TagName == "li")
                    {
                        string id = ctrl_li.ID;
                    }
                }
            }
        }

这不起作用，尽管我的页面上有li，我也根本无法获得"li"

this doesn't work i can't get the 'li' at all although there are li on my page

 protected void CreateBlockOfData(string widget_color, int column_par, string process_name, int block_type, int block_id)
        {
            HtmlGenericControl outer_li = new HtmlGenericControl("li");
            outer_li.Attributes.Add("class", widget_color);
            if (column_par == 1)
            {
                column1.Controls.Add(outer_li);
            }
            else if (column_par == 2)
            {
                //uppnl_2.ContentTemplateContainer.Controls.Add(outer_li);
                column2.Controls.Add(outer_li);
            }
            else if (column_par == 3)
            {
                column3.Controls.Add(outer_li);
            }
            else if (column_par == 4)
            {
                column4.Controls.Add(outer_li);
            }
            ////////////////////////////////////////////////////////////
            HtmlGenericControl div_head = new HtmlGenericControl("div");
            div_head.Attributes.Add("class", "widget-head");
            outer_li.Controls.Add(div_head);
            ////////////////////////////////////////////////////////////
            HtmlGenericControl h3 = new HtmlGenericControl("h3");
            div_head.Controls.Add(h3);
            ///////////////////////////////////////////////////////////
            Label lbl_process_name = new Label();
            lbl_process_name.Text = process_name.TrimEnd();
            h3.Controls.Add(lbl_process_name);
            ///////////////////////////////////////////////////////////
            HtmlGenericControl div_content = new HtmlGenericControl("div");
            div_content.Attributes.Add("class", "widget-content");
            outer_li.Controls.Add(div_content);
            ////////////////////////Data//////////////////////////////
            Control crl_data = FormTheData(block_type, block_id);
            PlaceHolder1.Controls.Add(crl_data);
            crl_data.DataBind();
            div_content.Controls.Add(crl_data);
        }

推荐答案

我对此进行了测试，并手动添加了一些<li>.如果在标签中设置runat="server"，我可以让它们显示出来.因此，您用于生成和添加ListItems的代码不会使用runat来创建它们.

I tested this and added some <li>'s manually. I could get them to show up if I set runat="server" in their tag. So the code you're using to generate and add the ListItems is not creating them with the runat.

修改
您需要考虑使用MAW74656建议使用的实际ASP .NET控件(例如DataGrid或Repeater或BulletedList)代替HTML <ul>.

Edit
You made need to consider using an actual ASP .NET Control such as a DataGrid or Repeater or BulletedList as MAW74656 suggested instead of HTML <ul>'s.

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