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finding a string and replacing

Posted on 2013-11-18
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Last Modified: 2013-11-19
Hi,

I have just taken over a project from another engineer and the system he was using stored data results in XML files, however I need to go through and replace a certain data string with another based on an pre-requisite.  As I'm learning C# at the moment I figured it might be a nice little learning project at the same time.

The two XML nodes I'm looking at are Number and the Terminal address
What we are doing is looking at the (Host)Number (In this case 000421) and then changing the IP address to the new address based on a new criteria.   Now in theory this would be a simple user find and replace task however with over 100,000 results and multiple IP's for each (Host)Number that's carpel tunnel syndrome for anyone who attempts it plus new ones are being generated every day so its a but of an uphill struggle.

  XML snippet
<Transfer>
<TransferDateTime>2013-05-02T12:52:29.968</TransferDateTime>
<Terminal address="1.2.3.4" Port="76"/>
<Ident>
<Number>000421</Number>
<other irrelevant data>
</Ident>
</Transfer>

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So far I have a very simple bit of code that checks the root folder then creates a subfolder for each (Host)Number it finds and puts all the matching files into there no problems,  what I would then like to do is pull out all the  Terminal address and replace them however I assumed I could use the same code but as its not the same type of data (if that's the right wording) where as the nodes are easy to find with

  XDocument doc = XDocument.Load(@"location\file.xml");

            var Host = doc.Descendants("number");

            foreach (var number in Host)
            {
                Console.WriteLine(number.Value);
            }
            Console.ReadLine();

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however trying to get the  Terminal address is eluding me a bit, If i change the node to Transfer if brings back everything except the Terminal address and Port.

Any help would be greatly appreciated.
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Question by:Litation
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5 Comments
 

Accepted Solution

by:
Litation earned 0 total points
ID: 39657253
Never mind I think I cracked it using
XmlDocument doc = new XmlDocument();
doc.Load(@"location\file.xml");

XmlNodeList aNodes = doc.SelectNodes("/Transfer/Terminal");


foreach (XmlNode aNode in aNodes)
{
      XmlAttribute idAttribute = aNode.Attributes["address"];

   
   if (idAttribute != null)
   {
           string currentValue = idAttribute.Value;
            idAttribute.Value = "newvalue";
}

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0
 

Author Closing Comment

by:Litation
ID: 39657254
Solved it myself.
0
 
LVL 5

Expert Comment

by:allanau20
ID: 39657810
Hi Litation.

Just a kind fyi..

Line #2: you can remove the @ unless you want to span to another line like this:
doc.Load(@"location\
           file.xml");

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hope this helps.
0
 

Author Comment

by:Litation
ID: 39661180
I thought the @ stopped the \ being a line break in C#.  I thought I would have to put location\\file.xml without the @ e.g.  'C:\\folder\\file.xml'  rather than @'c:\folder\file.xml'
0
 
LVL 5

Expert Comment

by:allanau20
ID: 39661184
you're right;
string g = "\\\\server\\share\\file.txt";   // \\server\share\file.txt
string h = @"\\server\share\file.txt";      // \\server\share\file.txt

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