此页面缺少 CSS 所需的HtmlHead控件 正在添加的样式表链接。请添加<head runat="server" />。 我已经给出了runat="server"但问题没有解决什么问题，它将如何解决。
我在提供后收到此错误runat=server
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NotSupportedException: This page is missing a HtmlHead control which is required for the CSS stylesheet link that is being added. Please add "server">.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[NotSupportedException: This page is missing a HtmlHead control which is required for the CSS stylesheet link that is being added. Please add "server">.]
AjaxControlToolkit.ScriptObjectBuilder.RegisterCssReferences(Control control) +249
AjaxControlToolkit.ExtenderControlBase.OnPreRender(EventArgs e) +135
System.Web.UI.Control.PreRenderRecursiveInternal() +77
>我从内容页面中删除了头部标签并解决了问题