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Parsing XML using LINQ

Posted on 2011-09-21
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Last Modified: 2013-12-17
Just started using LINQ as it seems very powerful at the moment but a little difficult to get in to.  Consider the following XML...

<?xml version="1.0"?>
<whereabouts date="15/9/2011" gangid="GB">
<job postcode="SG5 1EH" address="my address">
<patch id="25168" status="" surface_id="6mm Ashpalt" />
<patch id="25169" status="" surface_id="6mm Ashpalt" />
</job> 
<job postcode="SG5 2EH" address="17 High Street" >
<patch id="25198" surface_id="6mm Ashpalt />
<patch id="25199" surface_id="6mm Ashpalt/>
</job>
</whereabouts>

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I have an object Job which contains a List<Patch> where Patch is another object.  Firstly I want to be able to read just the 'whereabouts' node so that I can perform a quick sanity check - how do you select a single node like this?

Secondly I would like to read all of the jobs and patches into objects.  I know that I could do something like :-

 
List<Job> jobs =
	(from job in xmlDoc.Descendants("job")
	select new Job
	{
	Postcode = job.Element("postcode").Value,
	Address = job.Element("address").Value,
	}).ToList<Job>();

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To read the jobs into a list of <Job> objects but is it possible to read the 'Patches' sub-nodes and directly populate the list of patches within each job?  If not how can I associate the patches with the job?
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Question by:ChrisMDrew
5 Comments
 
LVL 96

Expert Comment

by:Bob Learned
ID: 36578019
I believe that you are looking for something like this:


List<Job> jobs =
	(from job in xmlDoc.Descendants("job")
	select new Job
	{
    	    Postcode = job.Element("postcode").Value,
	    Address = job.Element("address").Value,
            PatchList = job.Elements("patch"),
	}).ToList<Job>();

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0
 
LVL 16

Accepted Solution

by:
Easwaran Paramasivam earned 300 total points
ID: 36578403
I hope your problem selecting subnodes (patches) as well. I've came accross the same kind of problem and you could find your solution there.

 http://www.experts-exchange.com/Programming/Languages/.NET/ASP.NET/Q_27305052.html?cid=1135#a36535232

Good luck!!
0
 
LVL 3

Assisted Solution

by:nixkuroi
nixkuroi earned 200 total points
ID: 36578570
First set up your classes like this:

        public class Patch
        {
            public int ID { get; set; }
            public string Status { get; set; }
            public string SurfaceID { get; set; }
        }

        public class Job
        {
            public string Address { get; set; }
            public string PostCode { get; set; }
            public List<Patch> Patches = new List<Patch>();
        }

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Then, you can read your xml and parse it into your List<Job> like this:

XElement jobsElem= XElement.Parse("<whereabouts date=\"15/9/2011\" gangid=\"GB\"><job postcode=\"SG5 1EH\" address=\"my address\"><patch id=\"25168\" status=\"\" surface_id=\"6mm Ashpalt\" /><patch id=\"25169\" status=\"\" surface_id=\"6mm Ashpalt\" /></job> <job postcode=\"SG5 2EH\" address=\"17 High Street\" ><patch id=\"25198\" surface_id=\"6mm Ashpalt\" /><patch id=\"25199\" surface_id=\"6mm Ashpalt\"/></job></whereabouts>");

List<Job> Jobs = new List<Job>();
jobsElem.Elements("job").ToList().ForEach(f =>
{

    string postcode = (f.Attribute("postcode") != null && !String.IsNullOrWhiteSpace(f.Attribute("postcode").Value)) ? f.Attribute("postcode").Value : string.Empty;
    string address = (f.Attribute("address") != null && !String.IsNullOrWhiteSpace(f.Attribute("address").Value)) ? f.Attribute("address").Value : string.Empty;
    Job job = new Job() { Address = address, PostCode = postcode };
    if (f.HasAttributes)
    {
        f.Elements("patch").ToList().ForEach(p =>
        {
            int id = 0;
            if (p.Attribute("id") != null && !String.IsNullOrWhiteSpace(p.Attribute("id").Value))
                Int32.TryParse(p.Attribute("id").Value, out id);
            string status = (p.Attribute("status")!=null && !String.IsNullOrWhiteSpace(p.Attribute("status").Value))? p.Attribute("status").Value: string.Empty;
            string surfaceid = (p.Attribute("surface_id") != null && !String.IsNullOrWhiteSpace(p.Attribute("surface_id").Value)) ? p.Attribute("surface_id").Value : string.Empty;
            job.Patches.Add(new Patch() { ID = id, Status = status, SurfaceID = surfaceid });
        });
    }
    Jobs.Add(job);
});

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LVL 5

Expert Comment

by:Jeroen Timmermans
ID: 36579068
Another route is to serialize the XML to the Job-object.
0
 

Author Closing Comment

by:ChrisMDrew
ID: 36579207
Thanks to all - this has made my business object very easy to generate from the XML.  Adding checks to ensure that the attributes exist is definately a good idea also.
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