Querying XML with LINQ to XML

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Hi all!

My application traces messages into xml-file by using LINQ to XML XElement. Here is sample of result xml-file:

<xml version="1.0" encoding="utf-8"?>
<Messages>
  <Message>
    <timeStamp>10.12.2010 12:05:57</timeStamp>
    <Level>Error</Level>
    <PID>1256</PID>
    <traceMessage>Error happened </traceMessage>
  </Message>
  <Message>
    <timeStamp>10.12.2010 12:06:07</timeStamp>
    <Level>Info</Level>
    <PID>5168</PID>
    <traceMessage>This is just info message</traceMessage>
  </Message>
  <Message>
<Messages>

Now my task is to create WPF application which reads that xml file and shows messages. The problem is that message level varies (error, info.) and I need create some filter or query which shows only wanted messages. For example "show only Error messages". How do I do that?

Or is it even possible query that format or do I have to change little bit my file formation? I kindly ask your help.

I hope you got my idea :)

Cheers

Posted 30-Dec-10 18:46pm

paleGegg0

Updated 30-Dec-10 18:56pm

vivekse

v2

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Hiren solanki 31-Dec-10 2:02am

see my updated answer, this might help you.

Hiren solanki 31-Dec-10 2:18am

Thank you raistu for your kind word, Enjoy. Cheers.

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Hiren solanki · Accepted Answer · 2010-12-30T19:00:00

If your traceMessage Element have always Error word inside then you can filter based on string comparison if it contains Error then it's Error message.

But I would suggest you to add one attribute to Message Element like to show a category whether it's error or Info.

like

XML

<Message Category="Error">
...
...
</Message>
<Message Category="Info">
...
...
</Message>

It will be easier to apply LINQ to filter data.

[Update]

Ah!! Thanks for updating raitu, I can suggest you following query that might help you.

C#

var resultXML = from c in TraceMessage.Elements("Message")
                      where ((string)c.Element("traceMessage")).Contains("Error")
                      select new {
                                    Timestamp = (String)c.Element("timestamp"),
                                     Level = (string)c.Element("Level"),
                                     PID = (string)c.Element("PID"),
                                     traceMessage  = (string)c.Element("tracemessage") };