Today, I encountered a strange problem during RSS parsing.

After a week of research, we can finally parse the formats rss2.0, 1.0, 0.92, and atom0.3. Today, when I continue testing, I suffered another setback,
An exception is thrown when an RSS file encoded by GBK is encountered!
For example: http://club.sohu.com/rss.shtml
RSS of this page.
In use

Xmldocument Doc =   New Xmldocument ();
Doc. Load (URL );
Xmltextwriter writer =   New Xmltextwriter ( " Data. xml " , Encoding. Default );

An exception is thrown. After I used WebClient to retrieve the XML file, it still failed to be saved. There will always be several characters that will become garbled, and then the XML file will become an invalid XML file!

I hope you can give me some advice. Thank you!