Question

I have a sample xml

<Lookup> 
    <Controller Name="Activity1" >
       <action Name="Editactivity1" appgroup="Something" productcode="SomethingElse"/>    
    </Controller> 
    <Controller Name="Activity2">    
       <action Name="Editactivity2" appgroup="Something1" productcode="SomethingElse2"/>  
    </Controller>
</Lookup>

I have the controller name and action name stored in variables.

var cntName;
var actName;

Based on these values I have to look up this Xml and fetch the corresponding appgroup and productcode values.

Note: example values for cntName would be Activity1 or Activity2 or ActivityN.
Example values for actName would be EditActivity1 or EditActivity2 or EditActivityN.

So based on these values i have to look up the xml, Hope I am clear with my problem statement.

I am reading my xml using traditional xmldatadocument, how do i change it to LINQ? Sample below.

XmlDocument xmlDocAppMod = new XmlDocument();
strFileName = System.Configuration.ConfigurationManager.AppSettings["AppModOptListPath"].ToString();
strFileLocation = System.Web.HttpContext.Current.Server.MapPath("~/" + strFileName);

xmlDocAppMod.Load(strFileLocation);

Thanks,
Adarsh

Answer 1

Basically, you have several options:

1. Load the document from disk and create an xPath expression to evaluate it:

   var doc = new XmlDocument();
   doc.Load(fileName);
   var node = doc.SelectSingleNode(
       string.Format("/Lookup/Controller[@Name='{0}']/action[@Name='{1}']", cntName, actName));
   
   if (node != null)
   {
   
           var appGroup = node.Attributes["appgroup"].Value;
           var productcode = node.Attributes["productcode"].Value;
   }
   

2. Another option could be to use XDocument:

       var doc = XDocument.Load("");
       var action = doc.Descendants("Controller")
           .Where(c =>
                      {
                          var controllerName = c.Attribute("Name");
                          return controllerName != null && controllerName.Value.Equals(cntName);
                      })
           .FirstOrDefault()
           .Elements("action")
           .Where(a =>
                      {
                          var controllerName = a.Attribute("Name");
                          return controllerName != null && controllerName.Value.Equals(actName);
                      })
           .FirstOrDefault();
       var appGroup = action.Attribute("appgroup").Value;
       var productCode = action.Attribute("productcode").Value;
   

UPDATE:

Of course, you could use xPath with Linq-to-XML as well:

var doc = XDocument.Load("");
var action = (XElement) doc.XPathEvaluate(string.Format("/Lookup/Controller[@Name='{0}']/action[@Name='{1}']", cntName, actName));
var appGroup = action.Attribute("appgroup").Value;
var productCode = action.Attribute("productcode").Value;