parsing a xml file with linq

Question

I have following xml structure:

 //this is the root
<factory ver="123" id="1">
    //can be a lot of lines
   <line id="123" name="line name">
         //can be alot of machines
         <machine id="101" Type="Weel">
           <setting Title="Filled" Value="No"  />
           <setting Title="Size"   Value="14" />
           <setting Title="Mandatory" Value="No"/>
        </machine>
        <machine id="222" Type="Reel">
           <setting Title="Filled" Value="No"  />
           <setting Title="Size"   Value="14" />
           <setting Title="Mandatory" Value="No"/>
        </machine>
   </line>
  <line id="312" name="line name1">
         <machine id="111" Type="Weel">
           <setting Title="Filled" Value="No"  />
           <setting Title="Size"   Value="14" />
           <setting Title="Mandatory" Value="No"/>
        </machine>
        <machine id="333" Type="Reel">
           <setting Title="Filled" Value="No"  />
           <setting Title="Size"   Value="14" />
           <setting Title="Mandatory" Value="No"/>
        </machine>

How I can via Linq and XDocument by given machine ID to get it's type and all it's settings(there can be much more not listed all of them).

Jon Skeet · Accepted Answer · 2011-09-05 20:16:24Z

3

Well, you can get to a particular machine easily like this:

var element = doc.Descendants("machine")
                 .FirstOrDefault(x => (int) x.Attribute("id") == targetId);

That will return null if there are no matching elements.

If you want to go from that to a dictionary of setting name to setting value, you can use:

// After checking whether `element` is null of course
var settings = element.Elements("setting")
                      .ToDictionary(x => x.Attribute("Title").Value,
                                    x => x.Attribute("Value").Value);

And the type is simple:

var type = (string) element.Attribute("Type");

answered Sep 5, 2011 at 20:16

Jon Skeet

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Comments

SLaks · Accepted Answer · 2011-09-05 20:15:23Z

0

Like this:

XElement.Parse(...).Descendants("machine").First(m => m.Attribute("id").Value == x)

answered Sep 5, 2011 at 20:15

SLaks

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