Question

我有这段代码

 protected void Page_Load(object sender, EventArgs e)
{
    DataSet.DestinationsDataTable GetDestinations = (DataSet.DestinationsDataTable)dta.GetData();
    Page.Title = GetDestinations.Rows[0]["Meta_Title"].ToString();

    HtmlMeta hm = new HtmlMeta();
    HtmlHead head = (HtmlHead)Page.Header;
    hm.Name = GetDestinations.Rows[0]["Meta_Desc"].ToString();
    hm.Content = GetDestinations.Rows[0]["Meta_Key"].ToString();
    head.Controls.Add(hm);  
}

它正在返回此错误（在内容页面上）

The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).

思想？

Answer 1

我没有看到错误消息中不清楚的内容。您的<head>标记包含<% %>块，因此您无法在运行时动态添加控件。

要解决此问题，请添加占位符并将元标记放在那里：

<html>
    <head>
        ...
        <asp:PlaceHolder runat="server" ID="metaTags" />
    </head>
...

然后：

protected void Page_Load(object sender, EventArgs e)
{
    DataSet.DestinationsDataTable GetDestinations = (DataSet.DestinationsDataTable)dta.GetData();
    Page.Title = GetDestinations.Rows[0]["Meta_Title"].ToString();

    HtmlMeta hm = new HtmlMeta();
    hm.Name = GetDestinations.Rows[0]["Meta_Desc"].ToString();
    hm.Content = GetDestinations.Rows[0]["Meta_Key"].ToString();
    this.metaTags.Controls.Add(hm);  
}

C＃＆amp;添加动态META标记

1 个答案: