部署后服务器出现异常

Question

我在页面加载时遇到以下异常：

A potentially dangerous Request.Form value was detected from the client (ctl00$main$txtPreviewOfFile="...y Teacher <PR+OJ>             ..."). 
Description: ASP.NET has detected data in the request that is potentially dangerous because it might include HTML markup or script. The data might represent an attempt to compromise the security of your application, such as a cross-site scripting attack. If this type of input is appropriate in your application, you can include code in a web page to explicitly allow it. For more information, see http://go.microsoft.com/fwlink/?LinkID=212874. 

Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (ctl00$main$txtPreviewOfFile="...y Teacher <PR+OJ>             ...").

在服务器上部署后出现错误，但在 Visual Studio 上却没有，即使我试图找到 Visual Studio Web 应用程序的异常工作正常。

我曾使用过validateRequest="false" 和requestValidationMode="2.0"，但在web.config 或page directive 上使用这些标签后，异常会被取消，但页面功能停止工作。

请帮助我处理例外情况。

Answer 1

使用Server.HtmlEncode()方法将html标签编码到文本框

txtPreviewOfFile.Text = Server.HtmlEncode(preview.ToString());