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Use XpathNavigator to navigate and edit XML data

, 12 Oct 2008 CPOL
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Use the XPathNavigator to edit and read XML. This article demonstrates how you can do, using conditions.

Introduction

Use the XPathNavigator to read XML. This article demonstrates how you can do, using conditions.

Background

- ASP.NET, C# Medium Knowledge.

- XML and XPATH Knowledge.

Using the code

This article demonstrates how to read data from a XML File, using XPATH. So, let the words aside and go to work.

This is the XML Source:

      
<?xml version="1.0" encoding="utf-8" ?>
<Roles>
<Role name="Admin">
<Username><![CDATA[<span class="code-SummaryComment">hGUC0QB2G3l1cb0YSnJkUJpcQB2cv6h3]]></span></Username>
<Password><![CDATA[<span class="code-SummaryComment">P3W+pDC2Vn/TH1Bbgmm/1A==]]></span></Password>
</Role>
</Roles>
 
//Next, this is the method to get values from XML file:

private MyCredential[] GetAdminCredentials()
{
HttpServerUtility server = HttpContext.Current.Server;
List<MyCredential> credentials = new List<MyCredential>();
try
{
XmlDocument xmlDocument = new XmlDocument();
string filename = @".\Roles.xml";
xmlDocument.Load(server.MapPath(filename));
XPathNavigator nav = xmlDocument.CreateNavigator();
XPathNodeIterator iterator = nav.Select("Roles/Role[@name='Admin']"); //this is a condition. Only nodes which contains role name = 'admin' are processed.
while (iterator.MoveNext()) //while there are nodes where role name='admin'
{
MyCredential credential = new MyCredential();
iterator.Current.MoveToChild("Username",string.Empty);
credential.Username = CryptographyServices.Decrypt(iterator.Current.Value);
iterator.Current.MoveToParent(); //move to root
iterator.Current.MoveToChild("Password", string.Empty);
credential.Password = CryptographyServices.Decrypt(iterator.Current.Value);
credentials.Add(credential);
iterator.Current.MoveToParent(); //move to root again
}
return credentials.ToArray();
}
catch (Exception innerException)
{
throw innerException;
}

}

Points of Interest

In next article we will update a xml file using CData Sections. Thanks for your attention.

History

Keep a running update of any changes or improvements you've made here.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

David Rosa
Engineer GISP Software, SA.
Portugal Portugal
Degree in Computer Engineering at the Autonomous University of Lisbon - Portugal (UAL - Universidade Autónoma de Lisboa).
Worked at Unisys Portugal in ASP.NET 2.0 Technology and Microsoft Office SharePoint Server 2007 not forgetting adjacent technologies.
Worked also as Technical Coordinator of the GMTS's (Global Media Technology Solutions) Junior Development Team in the Portals Area, using Microsoft Office SharePoint Server 2007, ASP.NET, WPF, Silverlight and Frameworks 2.0, 3.0 and 3.5.
Now,he is working for GISP Software SA, a software house focused in the media market, as Software Engineer.

Comments and Discussions

 
GeneralThanks PinmemberAboShehab_FCIS28-Oct-09 3:19 
GeneralUse Linq to XML instead PinmemberWileCoyot13-Oct-08 11:10 
GeneralRe: Use Linq to XML instead Pinmemberbaudhayana1-Sep-09 22:05 

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