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Nov 4th, 2009

Strange Root element missing exception in XML

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I get an error trying to parse som XML. The error is System.Xml.XmlException: Root element is missing.. , and I can't understand why. Here is the code I run:

C# Syntax (Toggle Plain Text)
            MemoryStream xmlStream = new MemoryStream();
            StreamWriter xmlStreamWriter = new StreamWriter(xmlStream);
            String xml = "<html>\n<body>\n\n<h1>My First Heading</h1>\n\n<p>My first paragraph.</p>\n\n</body>\n</html>";
            xmlStreamWriter.Write(xml);
            xmlStreamWriter.Flush();
            XmlReader reader = XmlReader.Create(xmlStream);
 
            StringWriter jsonStringWriter = new StringWriter();
            JsonWriter writer = new JsonTextWriter(jsonStringWriter);
            writer.Formatting = Newtonsoft.Json.Formatting.Indented;
            JsonMLParser.Encode(reader, writer);
            MemoryStream xmlStream = new MemoryStream();
            StreamWriter xmlStreamWriter = new StreamWriter(xmlStream);
            String xml = "<html>\n<body>\n\n<h1>My First Heading</h1>\n\n<p>My first paragraph.</p>\n\n</body>\n</html>";
            xmlStreamWriter.Write(xml);
            xmlStreamWriter.Flush();
            XmlReader reader = XmlReader.Create(xmlStream);

            StringWriter jsonStringWriter = new StringWriter();
            JsonWriter writer = new JsonTextWriter(jsonStringWriter);
            writer.Formatting = Newtonsoft.Json.Formatting.Indented;
            JsonMLParser.Encode(reader, writer);

The exception gets thrown during JsonMLParser.Encode() during reader.MoveToContent() which is the first call to the xml-reader.

Last edited by Alxandr; Nov 4th, 2009 at 6:29 pm.

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Alxandr

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Nov 4th, 2009

Re: Strange Root element missing exception in XML

Reset the stream position before instantiate the reader.

C# Syntax (Toggle Plain Text)
xmlStream.Position = 0;
XmlReader reader = XmlReader.Create(xmlStream);
reader.MoveToContent();
.....
xmlStream.Position = 0;
XmlReader reader = XmlReader.Create(xmlStream);
reader.MoveToContent();
.....

adatapost

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Nov 5th, 2009

Re: Strange Root element missing exception in XML

Perhaps because you're trying to parse html/xhtml with an xml reader, and they're different formats.

sknake

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Nov 5th, 2009

Re: Strange Root element missing exception in XML

Click to Expand / Collapse Quote originally posted by adatapost ...

Reset the stream position before instantiate the reader.
C# Syntax (Toggle Plain Text)
xmlStream.Position = 0;
XmlReader reader = XmlReader.Create(xmlStream);
reader.MoveToContent();
.....
xmlStream.Position = 0; XmlReader reader = XmlReader.Create(xmlStream); reader.MoveToContent(); .....

Thnx. You're completely right.

Alxandr

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