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How to safely HTML encode content which may already be HTML encoded?

I need to HTML encode some text which may or may not already be HTML encoded (perhaps only partially). Is the following safe? Are there any characters/encodings that 开发者_JAVA百科could cause unexpected behaviour?

HttpUtility.HtmlEncode(HttpUtility.HtmlDecode(text))

Thanks


Your logic "HttpUtility.HtmlEncode(HttpUtility.HtmlDecode(text))" is safe. There is a standard for HTML characters encoding. Take a look.


There is no built-in functionality. But I would use:

 return 
     HttpUtility.HtmlDecode(text)!=text ? text : HttpUtility.HtmlEncode(text);
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