Question

I need to validate as fast as possible and receive the next xml-data on socket.

I am using this method to validate received xml-datas.

private validateRecievedXmlCallback()
{
  try
  {      
    XmlReader xreader = XmlReader.Create(new StringReader(xmlData));
    while (xreader.Read()) ;
  }
  catch (Exception)
  {
    return false;
  }

  return true;
}

But I think this method is not efficient enought. I actually need to check the last tag only.

example:

<test valueA="1" valueB="2">
   <data valueC="1" />
   <data valueC="5" />
   <data valueC="5">220</data>
</test>  //I need to check if </test> tag closed, but whats the best way to do it?

Answer 1

If you stick with the XmlReader, you could use XmlReader.Skip() which, well, skips the content of the current element.

So

xreader.ReadStartElement("test"); // moves to document root, throws if it is not <test>
xreader.Skip(); // throws if document is not well-formed, e.g. root has no closing tag.

As other commenters have stated already, there is no good way of guaranteeing well-formedness of a XML document except for using a XML parser.