How do I XmlDocument.Save() to encoding=“us-ascii” with numeric character entities instead of question marks?

Question

My goal is to get a binary buffer (MemoryStream.ToArray() would yield byte[] in this case) of XML without losing the Unicode characters. I would ex

Answer 1

You can use XmlWriter instead:

  var doc = new XmlDocument();
    doc.LoadXml("<x>“∞π”</x>");
    using (var buf = new MemoryStream())
    {
        using (var writer =  XmlWriter.Create(buf, 
              new XmlWriterSettings{Encoding= Encoding.ASCII}))
        {
            doc.Save(writer);
        }
        Console.Write(Encoding.ASCII.GetString(buf.ToArray()));
    }

Outputs:

<?xml version="1.0" encoding="us-ascii"?><x>&#x201C;&#x221E;&#x3C0;&#x201D;</x>