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Read large XML file with Powershell

Posted on 2010-08-30
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Last Modified: 2013-12-04
I have a 500mb+ xml file I need to break apart, but every time I do Get-Content file it is too large for memory. Is there any way to process each node in the root one at a time similar to reading a stream?

The error: Exception of type 'System.OutOfMemoryException' was thrown.
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Question by:RyanAndres
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Expert Comment

by:rockiroads
ID: 33561176
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Author Comment

by:RyanAndres
ID: 33563459
No, it uses $xml = [xml](gc file) ....

This is what I tried and it will load the entire file into memory.. which will cause the exception.
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Accepted Solution

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Chris Dent earned 500 total points
ID: 33565457

You should be able to initialise an instance of System.Xml.XmlReader using the StreamReader.

e.g.

$Reader = New-Object IO.StreamReader("FullPathToFile")
$XmlReader = [Xml.XmlReader]::Create($Reader)

Since it's reading it as a stream rather than loading the entire file into memory it "should" work better. However, I cannot test that theory since I don't have any large XML files.

Chris
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Author Closing Comment

by:RyanAndres
ID: 33568419
Cool I used XmlTextReader and Writer.
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