Question

I am developing asp.net mobile application. I am using the XML as a database. I am using the following part of the XML file to query the data by using the LINQ to XML.

<USER-INTERFACE-DEFINITION>
      <MIMICS>
       <MIMIC ID="1" NAME="Home">
        <SECTIONS>
         <SECTION ID ="1" NAME="System Health" CONTROL-TYPE="Button">
          <DATAITEMS>
          </DATAITEMS>
         </SECTION>
         <SECTION ID ="2" NAME="Network Status" CONTROL-TYPE="Button">
          <DATAITEMS>
          </DATAITEMS>
         </SECTION>
         <SECTION ID ="3" NAME="ESD Status" CONTROL-TYPE="Button">
          <DATAITEMS>
          </DATAITEMS>
         </SECTION>
         <SECTION ID ="4" NAME="DWPLEM" CONTROL-TYPE="Button">
          <DATAITEMS>
          </DATAITEMS>
         </SECTION>
         <SECTION ID="5" NAME="Manifolds" CONTROL-TYPE="Drowpdown">
          <DATAITEMS>
          </DATAITEMS>
         </SECTION>
         <SECTION ID ="6" NAME="Wells" CONTROL-TYPE="Drowpdown">
          <DATAITEMS>
          </DATAITEMS>
         </SECTION>
         <SECTION ID ="7" NAME="Alarms" CONTROL-TYPE="Button">
          <DATAITEMS>
          </DATAITEMS>
         </SECTION>
         <SECTION ID ="8" NAME="House Keeping" CONTROL-TYPE="Button">
          <DATAITEMS>
          </DATAITEMS>
         </SECTION>
        </SECTIONS>
       </MIMIC>
    </USER-INTERFACE-DEFINITION>

In the above XML file I want to retrive the “NAME” attribute of the SECTION node with the condition MIMIC ID=”1″. I dont want to modify my existing XML file. I have the server collection of node with simialr elements as the above XML file. Can you please provide me any code or link through which I can resolve the above issue ?

Answer 1

var xml = XElement.Parse("your xml");
var q = from m in xml.Descendants("MIMIC")
        where (int)m.Attribute("ID") == 1
        from s in m.Descendants("SECTION")
        select (string)s.Attribute("NAME");

foreach ( var name in q ) {
    Console.WriteLine(name);
}

I have tested the above in LINQPad and it does indeed produce:

    System Health
    Network Status
    ESD Status
    DWPLEM
    Manifolds
    Wells
    Alarms
    House Keeping