After my TLC session on XML Tools in Visual Studio a gentleman came up to me and asked me a question. He said that he deals with XML coming over the pipe and their usually isn’t an end-of-file character at the end of his email document. He was trying to figure out how he can create a DOM over the valid XML. He was using one reader to do this. I knew that he could use the subtree reader but I didn’t have any code handy to give him. So I played around a bit and here is what I came up with:
|
public void TestSubTreeReader()
{
XmlReaderSettings readerSettings = new XmlReaderSettings();
readerSettings.ConformanceLevel = ConformanceLevel.Document;
// this is the XML being used:
/*
<?xml version="1.0" encoding="utf-8" ?>
<root>
<a> </a>
<b attribute="adkj">
text 1
<c> text 2 </c>
</b>
<d> text 3</d>
</root>
<outsideelement/>
*/
string srcfile = "sample.xml";
XmlReader xReader = XmlReader.Create(srcFile, readerSettings);
while (xReader.Read())
{
if (xReader.Name == "root")
{
XmlReader subTreeReader = xReader.ReadSubtree();
XmlDocument doc = new XmlDocument();
doc.Load(subTreeReader);
return;
}
}
} |
I approximated his scenario by using an XML file with two elements at the root level (which as we all know is not well-formed). I wanted to make sure that I create a DOM only on top of the “root” element.
In the while loop above I read the XML Declaration and eat it (I can see you wanting to use it for something interesting, but in my scenario, I do nothing with it). I then check to see if my reader is on the “root” node, if it is I create a new reader that is going to start at my root node and then read until it reaches the end root node.
I was worried that the subtree reader would not return the initial root node and would eat the end root node, but it doesn’t. The ReadSubtree() method returns a reader over the current node and all of it’s descendants.
So, there it is, I hope it helps.
Basking in the sun (or will be right after I post this) in beautiful Boston
Neetu Rajpal
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