How/Can I use linq to xml to query huge xml files with reasonable memory consumption?

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Using XElement.Load will load the whole file into the memory. Instead, use XmlReader with the XNode.ReadFrom function, where you can selectively load notes found by XmlReader with XElement for further processing, if you need to. MSDN has a very good example doing just that: http://msdn.microsoft.com/en-us/library/system.xml.linq.xnode.readfrom.aspx

If you just need to search the xml document, XmlReader alone will suffice and will not load the whole document into the memory.

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