Tridion 2011 Core Service get keyword tcm from ComponentData

Question

I'm getting the content from a component and in this content I have a field that represents a keyword. How could I get the tcm from that keyword? "etiquetas" field is my keywords.

<destacado_evento xmlns="uuid:65081b19-5ae5-4e3e-a9d0-371ce48b0694">
    <titulo>Evento Skyfall</titulo>
    <imagen xlink:type="simple" xlink:href="tcm:12-3580" xlink:title="Multimedia Ficha Evento" xmlns:xlink="http://www.w3.org/1999/xlink" />
    <etiquetas>Nuestros compromisos</etiquetas>
    <fecha_inicio>2016-04-07T14:36:33</fecha_inicio>
    <fecha_fin>2016-04-16T20:00:48</fecha_fin>
</destacado_evento>

The problem is that I don't know the category. I get that information from:

foreach (ItemFieldDefinitionData field in schema.Fields)
{
    XmlElement schemaFields = contenidoComponentes.CreateElement(field.Name);
    schemaFields.InnerText = field.Description;
    schemaNode.AppendChild(schemaFields);
}

Answer 1

If you load the Component with LoadFlags.KeywordXlinks, you will find that the XML elements representing Keyword field values get an xlink:href attribute which contains the Keyword ID (TCM URI or WebDAV URL depending on whether you also specify LoadFlags.WebDavUrls or not).

This is by far the cheapest way to get the Keyword IDs.

Answer 2

If you have the title for the keyword and know the category attached to the component field, you can use below function to get the keyword id.

string GetKeywordId(string KeywordTitle, string categoryID)
{
    KeywordsFilterData kwdFilter = new KeywordsFilterData();

    var query1 = from XElement r1 in tridionClient.GetListXml(categoryID, kwdFilter).Descendants()
                 where r1.Attribute("Title").Value.ToLower() == KeywordTitle.ToLower()
                 select r1;
    XElement foundNode = query1.FirstOrDefault();
    if (foundNode != null)
    {
           string keywordID = foundNode.Attribute("ID").Value;
           return keywordID;
    }

    return "";
}