How to get an item value from XMLreturned from webservice

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hello all,

I have a webservice that returns this XML

HTML

<UpdateSalesHeaderResponse xmlns="http://tempuri.org/">
<UpdateSalesHeaderResult>true</UpdateSalesHeaderResult>
</UpdateSalesHeaderResponse>

How can i get the value of UpdateSalesHeaderResult tag?

I currently do this:

C#

XmlDocument doc = new XmlDocument();

                    // Load data  
                    doc.Load("http://localhost/xxxxx/Service1.svc/xxxxxx");

                    // 

                    if (doc.SelectSingleNode("//UpdateSalesHeaderResult").InnerText == "true")
                    {
                        //do smth
                    }
                    else
                    {
                        //do smth
                    }

the error says :"Object reference not set to an instance of an object." at this point doc.SelectSingleNode("//UpdateSalesHeaderResult").InnerText

Posted 15-Feb-13 1:31am

IviKAZAZI

Updated 16-Feb-13 1:17am

v2

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Comments

Fred Flams 15-Feb-13 10:00am

Hello, and what is your problem ? That snippet of code should work.

fjdiewornncalwe 15-Feb-13 10:12am

I agree with Fred. This code should work.
Have you debugged your code to make sure you are getting back the xml that expect? That's about the only thing here to check right now that I could suggest.

Fred Flams 16-Feb-13 3:51am

Have you tried trimming the content of the InnerText property ?
I mean: doc.SelectSingleNode("//UpdateSalesHeaderResult").InnerText.Trim() == "true"

2 solutions

Solution 1

I think it is the namespace causing an issue (note I don't fully get them so feel free to improve this answer)

C#

// Load data
doc.Load("http://localhost/xxxxx/Service1.svc/xxxxxx");
XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable);
nsmgr.AddNamespace("tu", @"http://tempuri.org/");

if (doc.SelectSingleNode("//tu:UpdateSalesHeaderResult", nsmgr).InnerText == "true")
{
    //do smth
}
else
{
    //do smth
}

Posted 15-Feb-13 5:31am

Chris Reynolds (UK)

Comments

Fred Flams 16-Feb-13 3:50am

Well actually, I d'ont think the namespace can be the cause of the problem since tempuri.org is the default xml namespace for all xml document. Plus this is enforced by the opening tag where the namespace is specified using xmlns without anything else, that alone declares a default namespace.

Chris Reynolds (UK) 16-Feb-13 4:12am

And that's what I thought too, hence my hesitancy in the answer, thanks for confirming. But I pasted the OP's code and XML into VS and the only way I could get the SelectSingleNode to work was to include the namespace. Feel free to have a dig at it yourself as I'm away from work now and can't get at the code I hacked together yesterday

IviKAZAZI 16-Feb-13 6:17am

Fred Its right !

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IviKAZAZI · Accepted Answer · 2013-02-16T01:45:00

I ended up using XMLReader:

C#

XmlTextReader reader = new XmlTextReader("http://localhost/xxxxxxxx/Service1.svc/xxxxx<pre lang="cs">&quot;);

              // Skip non-significant whitespace
              reader.WhitespaceHandling = WhitespaceHandling.Significant;

              // Read nodes one at a time
              while (reader.Read())
              {
                 if(reader.Value == &quot;true&quot;)
                 {
                     //do smth
                 }
              if(reader.Value == &quot;false&quot;)
                 {
                     //do smth
                 }

              }</pre>