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Searching/Editing XML using Linq

Posted on 2013-11-05
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Last Modified: 2016-02-10
I have some XML(see below) that I want to parse using Linq in C#.NET.  I want to:

1. Count the number of hardware nodes
2. Read the value for each CardID under each Hardware node
3. Change the CardModel value under each Hardware node

I apologize for this over simplified version of what I am trying to accomplish, but I believe this hits on all the points.

I have tried the following code to simply count the hardware nodes, but the query contains no elements.
XElement root = XElement.Load(myXMLPath);
            var query = from c in root.Elements("Hardware")
                        select c;

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Example XML
<MyDataSet xmlns="http://tempuri.org/MyDataSet.xsd">
     <Hardware>
          <CardID>0</CardID>
          <CardPCISlot>0</CardPCISlot>
          <CardModel>130</CardModel>
     </Hardware>
     <Hardware>
          <CardID>1</CardID>
          <CardPCISlot>2</CardPCISlot>
          <CardModel>145</CardModel>
     </Hardware>
</MyDataSet>

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Question by:efryevt
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3 Comments
 
LVL 63

Accepted Solution

by:
Fernando Soto earned 500 total points
ID: 39626355
Hi efryevt;

When your XML document uses Namespace's you need to access all the nodes with that same Namespace as shown in code snippet.

XElement root = XElement.Load(myXMLPath);
XNamespace ns = "http://tempuri.org/MyDataSet.xsd";

var query = from c in root.Elements(ns + "Hardware")
            select c;
// Count the number of hardware nodes            
var hwCount = query.Count();
// Read the value for each CardID under each Hardware node
var cardIds = query.Elements(ns + "CardID").Select (c => c.Value ).ToList();
// Get the nodes to be changed
var modelNo = query.Elements(ns + "CardModel").ToList();

foreach (var model in modelNo)
{
    // Change the CardModel value under each Hardware node
    model.Value = model.Value + "ABC"; 
}

// At this point the XML document has CardModel value changed

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0
 

Author Closing Comment

by:efryevt
ID: 39627211
Thank you so much for your answer.  This is exactly what I was looking for.
0
 

Author Comment

by:efryevt
ID: 39627218
Question closed.
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