A potentially dangerous Request.Form value was detected from the client (FCKeditor="<img alt="" src=
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我操作的时候是 ASP.NET提示错误
搜到的资料是这样的解释的：
用户在页面上提交表单到服务器时，服务器会检测到一些潜在的输入风险，例如使用富文本编辑器控件（RichTextBox、FreeTextBox、CuteEditor等）编辑的内容中包含有HTML标记或脚本标记，ASP.NET页面会抛出一个"A potentially dangerous Request.Form value was deceted from the client"的异常。这个是ASP.NET页面为了防范页面注入功能的一种保护机制，要取消这种保护，常规的做法是在.aspx文件的<%@Page %>部分加入ValidateRequest="false"属性。但是从.NET 4.0开始你可能需要多修改一个地方，在网站的web.config文件中加入这行配置：
<system.web> <compilation debug="true" targetFramework="4.0"/> <httpRuntime requestValidationMode="2.0"/></system.web>
同时，你还需要确保页面上用户输入的部分不会存在任何注入攻击的代码，常用的做法是使用Encode处理。
我实际上是这样解决的：
遇到过不知道多少次这样的错误了，我每次都是更改
NET Framework
的版本号解决的！
本地测试没问题，服务器报错的话，多半是版本号的问题！
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