Linq to XML, select all attributes and their values for a given node

Question

I have an xml mapping file that looks something like this

Answer 1

as I am pushed for time I will use a 2 stage process

But would be interested to hear if this is possible in one query

var matchingModelXml = from c in mappings.Descendants("model")
                               where (string)c.Attribute("name") == "modelY"
                               select c;

var mappingAttributes = from b in matchingModelXml.Descendants("mapping")
                        where (string)b.Attribute("colour") == "White"
                        select b.Attributes();

Answer 2

Just because I like a challenge, here it is in one query:

XDocument test = XDocument.Parse("<colourMappings>    <model name=\"modelX\">        <mapping colour=\"White\" configCode=\"1\"></mapping>        <mapping colour=\"Aluminium\" configCode=\"2\"></mapping>        <mapping colour=\"Black\" configCode=\"3\"></mapping>        <mapping colour=\"Blue\" configCode=\"4\"></mapping>        <mapping colour=\"White Pearl\" configCode=\"5\"></mapping>        <mapping colour=\"Graphite\" configCode=\"6\"></mapping>        <mapping colour=\"Gunmetal\" configCode=\"7\"></mapping>        <mapping colour=\"Indigo\" configCode=\"8\"></mapping>        <mapping colour=\"Red\" configCode=\"9\"></mapping>    </model>    <model name=\"modelY\">        <mapping colour=\"White\" configCode=\"1\" stConfigCode= \"xx\" dgConfigCode=\"hj\"></mapping>        <mapping colour=\"Aluminium\" configCode=\"2\" stConfigCode= \"xy\" dgConfigCode=\"gh\"></mapping>        <mapping colour=\"Black\" configCode=\"3\" stConfigCode= \"xt\" dgConfigCode=\"fg\"></mapping>        <mapping colour=\"Blue\" configCode=\"4\" stConfigCode= \"sd\" dgConfigCode=\"fg\"></mapping>        <mapping colour=\"White Pearl\" configCode=\"5\" stConfigCode= \"df\" dgConfigCode=\"df\"></mapping>        <mapping colour=\"Graphite\" configCode=\"6\" stConfigCode= \"xc\" dgConfigCode=\"df\"></mapping>        <mapping colour=\"Gunmetal\" configCode=\"7\"  stConfigCode= \"cv\" dgConfigCode=\"cv\"></mapping>        <mapping colour=\"Indigo\" configCode=\"8\"  stConfigCode= \"zx\" dgConfigCode=\"vb\"></mapping>        <mapping colour=\"Red\" configCode=\"9\"  stConfigCode= \"fg\" dgConfigCode=\"cv\"></mapping>    </model></colourMappings>");

var maps = from model in test.Root.Elements("model")
           from attr in model.Attributes("name")
           from mapping in model.Elements("mapping")
           where attr.Value == "modelY" && mapping.Attribute("colour").Value == "White"
           select new
           {
                 configCode = mapping.Attribute("configCode").Value
               , stConfigCode = mapping.Attribute("stConfigCode").Value
               , dgConfigCode = mapping.Attribute("dgConfigCode").Value
           };

foreach (var map in maps)
{
    Console.Write("configCode: ");
    Console.WriteLine(map.configCode);
    Console.Write("stConfigCode: ");
    Console.WriteLine(map.stConfigCode);
    Console.Write("dgConfigCode: ");
    Console.WriteLine(map.dgConfigCode);
}

Answer 3

I know this is ancient now, but I think the way to solve this problem without doing more processing than neccessary looks something like this:

mappings.Root.Elements()
        .Where(cm => cm.Attribute("name").Value == "modelY")
        .SelectMany(cm => cm.Elements()
                            .Where(m => m.Attribute("colour").Value == "White")
                            .SelectMany(m => m.Attributes()));

In query format, it would be:

from cm in doc.Root.Elements()
where cm.Attribute("name").Value == "modelY"
from m in cm.Elements()
where m.Attribute("colour").Value == "White"
from att in m.Attributes()
select att;

Answer 4

Update

Summarized in a method:

public IEnumerable<XAttribute> GetAttributes(string modelName, string colour)
{
    XDocument mappings = XDocument.Load(@"D:\colour_mappings.xml");

    var q1 =
        from elm in mappings.Descendants("model")
        where (string)elm.Attribute("name") == "modelY"
        select elm;

    var q2 =
        from elm in q1.Descendants("mapping")
        where (string)elm.Attribute("colour") == "White"
        select elm.Attributes().Where(a => a.Name != "colour");


    foreach (IEnumerable<XAttribute> attributeList in q2)
    {
        foreach (XAttribute attribute in attributeList)
        {
            yield return attribute;
        }
    }
}