How to estimate memory need by XPathDocument for a specific xml file

Posted by bill seacham on Stack Overflow See other posts from Stack Overflow or by bill seacham
Published on 2010-12-30T01:48:54Z Indexed on 2010/12/30 1:54 UTC
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xpathdocument

Is there any way to estimate the memory requirement for creating an XpathDocument instance based on the file size of the xml?

XpathDocument xdoc = new XpathDocument(xmlfile);

Is there any way to programmatically stop the process of creating the XpathDocument if memory drops to a very low level?

Since it loads the entire xml into memory, it would be nice to know ahead of time if the xml is too big. What I have found is that when I create a new XpathDocument with a big xml file, an outofmemory exception is never fired, but that the process slows to a crawl, only 5 Mb of memory remains a available and the Task Manager reports it is not responding. This happened with a 266 Mb xml file when there was 584 Mb of ram. I was able to load a 150 Mb file with no problems in 18.

After loading the xml, I want to do xpath queries using an XpathNavigator and an XpathNodeIterator. I am using .net 2.0, xp sp3.

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