/silverlight/test.xunit-silverlight/Compatibility/Silverlight3/MissingMethods/System.Xml.XPath.Extensions.cs

using System.Collections.Generic;

using System.Xml.Linq;

using System.Linq;



namespace System.Xml.XPath

{

    internal static class Extensions

    {

        // VERY simple xpath helper method. Only useful for VERY simple expressions. Like what we need.

        // Thanks to Chris Cavanagh: http://chriscavanagh.wordpress.com/2009/04/11/micro-xpath-almost-in-silverlight-2/

        public static XElement XPathSelectElement(this XElement element, string expression)

        {

            return expression.Split('/').Aggregate(element, (e, name) => e.Element(name));

        }



        public static IEnumerable<XElement> XPathSelectElements(this XElement element, string expression)

        {

            // Split expression in parts

            // Get candidate elements for first part

            // Interrogate each candidate for 2nd part => new candidates

            // Interrogate each candidate for 3rd part



            var candidates = new List<XElement> {element};

            var parts = expression.Split('/');

            foreach (var part in parts)

            {

                var newCandidates = new List<XElement>();

                foreach (var candidate in candidates)

                {

                    newCandidates.AddRange(candidate.Elements(part));

                }

                candidates = newCandidates;

            }



            return candidates;

        }

    }

}