我正在开发 asp.net 网络项目。当我运行该项目时，它工作正常。但在服务器中，我收到以下错误。如何解决这个问题呢？
Using themed css files requires a header control on the page. (e.g. `<head 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. How to solve this problem?
Exception Details: System.InvalidOperationException: Using themed css files requires a header control on the page. (e.g. `<head runat="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:
[InvalidOperationException: Using themed css files requires a header control on the page. (e.g. <head runat="server" />).]
System.Web.UI.PageTheme.SetStyleSheet() +2458406
System.Web.UI.Page.OnInit(EventArgs e) +8699420
System.Web.UI.Control.InitRecursive(Control namingContainer) +333
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +378
我觉得如果页面不打算渲染 html，上面的答案都不能解决用户面临的实际问题。
在这种情况下，解决方案是 - 只需粘贴以下内容
EnableTheming = "False" StylesheetTheme="" Theme=""
在该页面的@Page 属性中。
例如，以下源代码示例：
下载文件.aspx。
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="DownloadFile.aspx.cs"
Inherits="WebUI.Monitorization.DownloadFile" EnableTheming="False" StylesheetTheme="" Theme="" %>
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