Comparing XML Files to see if there is a difference C#

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I am creating a console app that allows for someone to output and XML file. What I need is to be able to check every time it is run whether or not the XML file has changed and if so to increment it? Any ideas?

C#

XmlDocument doc = new XmlDocument();
if (doc.LastChild.Value == lsat saved doc)
{
   // My code here.
}

Posted 16-Aug-11 3:33am

TomGorton

Updated 16-Aug-11 3:38am

Andrew Rissing

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Wayne Gaylard · Answer 1 · 2011-08-16T03:49:00

Solution 1

You could try creating an MD5 hash of the xml file and check if the hashes are equal. You know the rest.

Posted 16-Aug-11 3:49am

Wayne Gaylard

Comments

TomGorton 16-Aug-11 10:03am

how would you do that? load the file and take the text from it or do you just put the whole file into it?

#realJSOP · Answer 2 · 2011-08-16T04:29:00

There are times when a MD5 hash could result in an identical result. I would perform several checks that took gradually more time:

0) See if the file sizes are the same

1) If they are the same size, load the files as text strings, eliminate the white space, and do a simple equality comparison.

TomGorton · Answer 3 · 2011-08-16T05:25:00

Solution 3

it was alright in the end i just used

C#

if (doc.InnerXml.Length != doc2.InnerXml.Length)
           {
               UpdateLatestVersion(newVersion);
           }

Posted 16-Aug-11 5:25am