Not able to read values using xpath

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Can we read values using xpath for complex xml file>???

Consider the below xml file (copied at the end of question). I want to read

PatchFile

tag information using xpath.

But when I used below expression it gives me result as null,

XmlDocument doc = new XmlDocument();
           doc.Load(@"E:\xmls\p_apsb11-16.xml");

           XmlElement root = doc.DocumentElement;
           XmlNodeList swupdatelist = root.SelectNodes("/Bulletin");

If I used * instead of giving name then it will give me proper result.

e.g. string Xpath_Expression=

root.SelectNodes("/*/*[4]/*/*/*");

If I used Tag name in xpath expression for simple xml file it gives me proper result. Please let me know if you have adea. How can we use tag name instead of giving * in xpath expression.

I have copied the required Xml below:-

XML

<Bulletin vendor="Adobe" id="APSB11-16" firstReleaseDate="6/29/2011" lastRevisionDate="6/29/2011" version="1.0" severity="Critical" xmlns="Resource.xsd">
    <Description>Security updates available for Adobe Reader and Acrobat</Description>
    <Summary>For users of Adobe Reader X (10.0.1) for Windows and Macintosh, Adobe has made available the update, Adobe Reader 9.4.4.</Summary>
    <ProviderReferences>
        <ProviderReference culture="en">
            <URL>http://www.adobe.com/support/security/bulletins/apsb11-16.html</URL>
        </ProviderReference>
    </ProviderReferences>
    <SoftwareUpdateGroups>
        <SoftwareUpdateGroup id="9215ff71-38c0-416a-b89a-fe3474160f41">
            <SoftwareUpdates>
                <SoftwareUpdate culture="en">
                    <PatchFiles>
                        <PatchFile id="1">
                            <Name>AdbeRdr830_en_US.msi</Name>
                            <Description>Adobe Reader 8.3 update - multiple languages</Description>
                            <FileName>AdbeRdr830_en_US.msi</FileName>
                            <PatchSize>34661</PatchSize>
                            <DatePublished>6/29/2011</DatePublished>
                            <DownloadURL>http://ardownload.adobe.com/pub/adobe/reader/win/8.x/8.3.0/en_US/AdbeRdr830_en_US.msi</DownloadURL>
                            <CommandLine> </CommandLine>
                            <InstallationType>870171E8-A8B1-4797-ADBD-5C112AD92FFA</InstallationType>
                            <BatchFileName> </BatchFileName>
                            <BatchFileURL>http://localhost/downloads/ </BatchFileURL>
                            <InventoryRule><![CDATA[666]]></InventoryRule>
                            <IsApplicableRule><![CDATA[<detection><installed><expression><and><expression><regKeyPathFileVersion versionStatus="HIGHER_OR_SAME"><key>HKEY_LOCAL_MACHINE\SOFTWARE\Adobe\Acrobat Reader\8.0\Installer</key><entry>Path</entry><filePath name="Reader\AcroRd32.dll" /><version>8.0.0.0</version></regKeyPathFileVersion></expression></and></expression></installed></detection>]]></IsApplicableRule>
                            <RebootRequired> </RebootRequired>
                            <Supercedence>
                                <SupercededFiles>
                                    <SupercededFile>
                                        <BulletinId> </BulletinId>
                                        <UpdateName> </UpdateName>
                                    </SupercededFile>
                                </SupercededFiles>
                            </Supercedence>
                            <PreRequisite GroupID="1">
                                <Resource>
                                    <Name>Adobe Reader 8.0.0 - English</Name>
                                    <ResourceType>SR</ResourceType>
                                    <ProductName>Office</ProductName>
                                    <InventoryRuleXml> </InventoryRuleXml>
                                </Resource>
                                <Resource>
                                    <Name>Adobe Reader 8.0.0 Gold - English</Name>
                                    <ResourceType>SP</ResourceType>
                                    <ProductName>Office</ProductName>
                                    <InventoryRuleXml>   </InventoryRuleXml>
                                </Resource>
                            </PreRequisite>
                        </PatchFile>
                    </PatchFiles>
                    <InfoURL>http://www.adobe.com/support/downloads/detail.jsp?ftpID=5123</InfoURL>
                </SoftwareUpdate>
            </SoftwareUpdates>
        </SoftwareUpdateGroup>
    </SoftwareUpdateGroups>
</Bulletin>

Posted 11-Jan-12 19:18pm

Sujeet Pardeshi

Updated 11-Jan-12 19:22pm

v2

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CPallini · Answer 1 · 2012-01-12T00:55:00

Solution 3

It works for me if I remove the reference to the schema file (i.e. xmlns="Resource.xsd") in the Bulletin node.
Have you such a file?

Posted 12-Jan-12 0:55am

CPallini

Comments

Sujeet Pardeshi 12-Jan-12 8:32am

Thanks for the reply....
After removing reference its working perfectly fine....:):)

CPallini 12-Jan-12 8:38am

You are welcome.

Sujeet Pardeshi 13-Jan-12 1:04am

Actually we are using Resource.xsd file to check if xml file is valid or not in our code. And today I have found solution.
In order to resolve references to schema file or namespace, we need to use XmlNamespaceManager class.

Here is the detailed code.
XPathDocument doc = new XPathDocument(@"E:\xmls\P_APSB11-21.xml");
XPathNavigator nav = doc.CreateNavigator();
XmlNamespaceManager nsmgr = new XmlNamespaceManager(nav.NameTable);
nsmgr.AddNamespace("ms", "Resource.xsd");

XPathNodeIterator PatchFilesiterator= nav.Select("//ms:PatchFiles",v);

Today I found that, if there is any reference to schema file or namespace then we need to resolve that reference using XmlNamespaceManager class.

KiranBabu M · Answer 2 · 2012-01-11T23:44:00

Solution 2

http://www.java2s.com/Code/CSharp/XML/ReadXMLnodeusingtheXMLpath.htm[^]

Using XPathNavigator in C#[^]

Posted 11-Jan-12 23:44pm

KiranBabu M

Comments

Sujeet Pardeshi 12-Jan-12 6:09am

But the mentioned solution is not working for above xml.

iliyash · Answer 3 · 2012-01-11T22:30:00

C#

//This is the Code to load your Xml file:

XmlDocument doc = new XmlDocument();
                doc.Load(@"E:\xmls\p_apsb11-16.xml");
//Extract All nodes which contains data

                var xmlCompanyNodes = doc.GetElementsByTagName("PatchFile");
               
//Iteration on Nodes
                foreach (XmlNode xmlCompanyNode in xmlCompanyNodes)
                {
// Extract all nodes which contains actual data
                    var result = xmlCompanyNode.ChildNodes;
//iteration on all nodes to get data
                    foreach (XmlNode variable in result)
                    {
// printing to check output
                        Console.WriteLine(variable.InnerText);

                       
                    }

                }