Question

I need to process loaded from ResponseStream on Async callbacks XML progressively.

Reply is have:

  <root>
     <node ...>
        .....
     </node>
     <node />
     ...
  </root>

schema, and i need to have ability process <node>‘s before they arrive complete.

Is there normal way to parse it using standard .NET?

Answer 1

System.Xml.XmlTextReader 

“Represents a reader that provides fast, non-cached, forward-only access to XML data.”

http://msdn.microsoft.com/en-us/library/system.xml.xmltextreader.aspx

Edit:
This is a quick hack, but it does demonstrate that the reader is in fact lazy.

 public class XmlTextReaderTest
    {
        public void RunTest()
        {
            var fs = new XmlTextReader(new Fs(@"c:\TestXml.xml"));
            while (fs.Read())
                File.AppendAllText(@"c:\xLog.txt", "Processing node..." + Environment.NewLine);
        }
    }

    public class Fs : FileStream
    {
        public Fs(string path)
            : base(path, FileMode.Open)
        {

        }

        public override int Read(byte[] array, int offset, int count)
        {
            File.AppendAllText(@"c:\xLog.txt", "Reading from stream..." + Environment.NewLine);
            var ans = base.Read(array, offset, count);
            return ans;
        }
}