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Query XML using Linq

Posted on 2012-03-23
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Last Modified: 2012-03-23
How do I get the employee list from below XML

<?xml version="1.0" encoding="utf-8"?>
<Employee>
  <Some_XML_1 />
  <Some_XML_2 />
  <EmployeeList>
    <id>1</id>
    <name>abc</name>
  </EmployeeList>
  <EmployeeList>
    <id>2</id>
    <name>def</name>
  </EmployeeList>
  <EmployeeList>
    <id>3</id>
    <name>hij</name>
  </EmployeeList>
</Employee>

I need a collection of ID & Name. Is it possible in LINQ or should we go back to DOM
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Question by:sansoftura
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10 Comments
 
LVL 20

Expert Comment

by:BuggyCoder
ID: 37758856
here is code for linq to xml for the same:-
var strXML =
                "<Employee><EmployeeList><id>1</id><name>abc</name></EmployeeList>" +
                "<EmployeeList><id>2</id><name>def</name></EmployeeList>" +
                "<EmployeeList><id>3</id><name>hij</name></EmployeeList></Employee>";

            var xmlElem = XElement.Parse(strXML);

            var list = xmlElem.Descendants("EmployeeList")
                .Select(e => new
                                 {
                                     ID = e.Descendants("id").First().Value,
                                     Name = e.Descendants("name").First().Value
                                 })
                .ToList();

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0
 
LVL 18

Expert Comment

by:Gary Davis
ID: 37758883
My version - use LinqPad for easy development:

      XElement data = XElement.Parse(
      @"<Employee>
            <Some_XML_1 />
            <Some_XML_2 />
            <EmployeeList>
                  <id>1</id>
                  <name>abc</name>
            </EmployeeList>
            <EmployeeList>
                  <id>2</id>
                  <name>def</name>
            </EmployeeList>
            <EmployeeList>
                  <id>3</id>
                  <name>hij</name>
            </EmployeeList>
            </Employee>");

      var employees = data.Descendants("EmployeeList");
      
      foreach (var employee in employees)
      {
            var id = employee.Element("id").Value;
            var name = employee.Element("name").Value;
            // Rest of code...
      }

Gary Davis
0
 
LVL 6

Author Comment

by:sansoftura
ID: 37758928
Thanks, But I get the following error for the the below code:

XElement xmlElem = XElement.Parse(strXML);

            var list = xmlElem.Descendants("EmployeeList")
                .Select(e => new
                                 {
                                     ID = e.Descendants("id").First().Value,
                                     Name = e.Descendants("name").First().Value
                                 })
                .ToList();



'System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement>' does not contain a definition for 'Select' and no extension method 'Select' accepting a first argument of type 'System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement>' could be found (are you missing a using directive or an assembly reference?)
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LVL 20

Expert Comment

by:BuggyCoder
ID: 37758955
using System.Linq;
using System.Xml.Linq;

Also add reference to System.Xml and System.Xml.Linq from add references in VS
0
 
LVL 6

Author Comment

by:sansoftura
ID: 37759031
Sorry both the solutions doesnt work. I get the count as 0 for the list  & its not even going inside the foreach loop. But there are records in the XML

Could it be because of xml namespace in the EmployeeList node?
0
 
LVL 18

Expert Comment

by:Gary Davis
ID: 37759098
There is no namespace shown in your data example above but if there is one in your actual data, it could have an effect.
0
 
LVL 6

Author Comment

by:sansoftura
ID: 37759115
OK here it is
<EmployeeList xmlns="http://...">
<id>1</id>
    <name>abc</name>
  </EmployeeList>
0
 
LVL 20

Assisted Solution

by:BuggyCoder
BuggyCoder earned 200 total points
ID: 37759149
ok here is code for console app that works perfectly for me:-
using System;
using System.Linq;
using System.Xml.Linq;

namespace EE_Console
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            var strXML =
                "<Employee><EmployeeList><id>1</id><name>abc</name></EmployeeList>" +
                "<EmployeeList><id>2</id><name>def</name></EmployeeList>" +
                "<EmployeeList><id>3</id><name>hij</name></EmployeeList></Employee>";

            var xmlElem = XElement.Parse(strXML);

            var list = xmlElem.Descendants("EmployeeList")
                .Select(e => new
                                 {
                                     ID = e.Descendants("id").First().Value,
                                     Name = e.Descendants("name").First().Value
                                 })
                .ToList();

            if (list.Count > 0)
            {
                Console.WriteLine("Total Items In List :{0}", list.Count);
                list.ForEach(Console.WriteLine);
            }

            Console.Read();
        }
    }
}

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Also i am attaching a screenshot for your reference.
Untitled.jpg
0
 
LVL 18

Accepted Solution

by:
Gary Davis earned 300 total points
ID: 37759236
This is my updated solution with namespace support.
Assuming each EmployeeList looks like this:

   <EmployeeList xmlns="http://a.com">

This is the code:

      XNamespace ns = "http://a.com";
      var employees = data.Descendants(ns + "EmployeeList");

      foreach (var employee in employees)
      {
            var id = employee.Element(ns + "id").Value;
            var name = employee.Element(ns + "name").Value;
            // Rest of code...
      }

Gary
0
 
LVL 18

Expert Comment

by:Gary Davis
ID: 37759302
A little better performance within the loop:

      XNamespace ns = "http://a.com";
      XName Id = ns + "id";
      XName Name = ns + "name";      

      var employees = data.Descendants(ns + "EmployeeList");
      employees.Dump("Employees");

      foreach (var employee in employees)
      {
            var id = employee.Element(Id).Value;
            var name = employee.Element(Name).Value;
            // Rest of code...
      }

Details at http://msdn.microsoft.com/en-us/library/cc716786.aspx

BuggyCoder's solution will also work with the appropriate edits.

Gary
0

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