xpath Query return null value

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XML

<Header>
      <reference>
        <identifier>BatchProcessed</identifier>
        <datetime>2011-08-15T05:12:00+10:00</datetime>
      </reference>
    </Header>
    <Header>
      <reference>
        <identifier>Running</identifier>
        <datetime>2011-08-15T05:12:00+10:00</datetime>
      </reference>
    </Header>

my xpath query is

C#

XmlNode node3 = xdoc.SelectSingleNode("//identifier/text()");

the query suppose to get the first identifier value " BatchProcessed".

but it returns null when i test but when i use the path in xml tool (online) it retruns value.

i don't know what am missing here,some one enlighten me

Posted 16-Aug-11 17:59pm

shan1395

Updated 16-Aug-11 18:44pm

Tarun.K.S

v2

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shan1395 · Answer 1 · 2011-08-16T19:16:00

Solution 3

figured it out

xdoc.SelectSingleNode("//*[local-name()='ServiceId']");

Posted 16-Aug-11 19:16pm

shan1395

Comments

Tarun.K.S 17-Aug-11 1:26am

What is a ServiceId?

shan1395 19-Aug-11 11:19am

xdoc.SelectSingleNode("//*[local-name()='identifier']");

Tarun.K.S · Answer 2 · 2011-08-16T18:43:00

Solution 2

Since you want the first identifier's value to be shown, you can do it in this way:

string value = xdoc.SelectSingleNode("//identifier[position()=1]").InnerText; //Returns BatchProcessed

Hope this helps.

Posted 16-Aug-11 18:43pm

Tarun.K.S

Updated 16-Aug-11 18:50pm

v2

Comments

shan1395 17-Aug-11 0:49am

this xpath make me crazy,no luck..still i got

Object reference not set to an instance of an object.

Tarun.K.S 17-Aug-11 0:50am

Did you replace xmlDoc with xdoc? :)
Modified my solution. Check now.

shan1395 17-Aug-11 1:14am

yeah i changed xdoc

Christian Graus · Answer 3 · 2011-08-16T18:00:00

Solution 1

You should not use text(). Just get the node, and then get the value of the node in code. XPath implimentations can vary. Using // is also wasteful, if your XML grows, you will find that it's slower than being more explicit in the path you want to search.

Posted 16-Aug-11 18:00pm

Christian Graus

Comments

shan1395 17-Aug-11 0:10am

even i tried your approach too

XmlNode nlst = xdoc.SelectSingleNode("//identifier");
string value= nlst.Value;

nlst have null value. am not sure what am missing here