XML Document Problem

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I'm having a problem in my XML document
When i'm selecting the nodes it is throwing an exception Expression must evaluate to a node-set.

My XML is ==>

HTML

<itemsearchresponse xmlns="http://webservices.amazon.com/AWSECommerceService/2009-03-31">
    <operationrequest>
        <requestid>d5220d4f-5798-4d05-82b0-6af6f97f5f5f</requestid>
        <arguments>
            <argument name="Condition" value="All"></argument>
            <argument name="Operation" value="ItemSearch"></argument>
        </arguments>
        <requestprocessingtime>0.2157430000000000</requestprocessingtime>
    </operationrequest>
    <items>
</items></itemsearchresponse>

i'm trying to access ItemSearchResponse node
by using this code

doc.SelectSingleNode("/ItemSearchResponse/");

I also have tried

doc.SelectSingleNode("//ItemSearchResponse/");

but same thing happening

Through my investigation i've reached the reason that this is because of xmlns attribute i also tried it after removing this attribute but no working

Complete code is

C#

XmlDocument doc = new XmlDocument();
                doc.Load(//my XML here);

                var node = doc.GetElementsByTagName("ItemSearchResponse")[0];
                var attrib = node.Attributes["xmlns"].Value;
                if(attrib == "http://webservices.amazon.com/AWSECommerceService/2009-03-31")
                {
                    node.Attributes["xmlns"].Value = "";
                    doc.InnerXml = node.OuterXml;
                }

Posted 3-Nov-11 2:54am

Syed Salman Raza Zaidi

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3 solutions

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Andrew Rissing · Answer 1 · 2011-11-03T03:28:00

Solution 1

You have a few problems going on here. When working with SelectSingleNode, you have to realize it is case-sensitive. Secondly, if you have a namespace defined within the XML, you must use a namespace manager to be able to properly access the elements.

Take a look at this[^] for how to use the the namespace manager.

Posted 3-Nov-11 3:28am

Andrew Rissing

Comments

RaisKazi 3-Nov-11 9:34am

My 5! Yes case-sensitive could be one of issue. I am probably feeling sleepy today. :)

Syed Salman Raza Zaidi 3-Nov-11 15:18pm

I've tried by taking care of case sensitive but still having the same problem :(

Andrew Rissing 3-Nov-11 22:05pm

You also need to handle the namespace issue.

UJimbo · Answer 2 · 2011-11-03T03:38:00

System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
doc.LoadXml(//your XML here);

System.Xml.XmlElement root = doc.DocumentElement;
System.Xml.XmlNamespaceManager nsmgr = new
System.Xml.XmlNamespaceManager(doc.NameTable);
nsmgr.AddNamespace("x", root.NamespaceURI); // x is our temp alias
System.Xml.XmlNode wptNode = root.SelectSingleNode("x:operationrequest", nsmgr);

Returns your operationrequest node.

Richard MacCutchan · Answer 3 · 2011-11-03T03:41:00

Solution 3

I am no expert in XML but a little bit of debugging showed me that ItemSearchResponse is the DocumentElement[^] property of your XML tree.

Posted 3-Nov-11 3:41am

Richard MacCutchan