How to update Component link -> embedded Component field value using TOM.NET Event System

Question

I would like to update an embedded Component field value when I check in my Page using TOM.NET Event System but the Component field value update is not happening.

I am not sure what am doing wrong here.

ItemFields componentFields = new ItemFields(component.Content, component.Schema);
if (componentFields.Contains("videoDetail"))
{
    EmbeddedSchemaField videoDetail = componentFields["videoDetail"] as EmbeddedSchemaField;
    if (videoDetail != null)
    {
        component.CheckOut();
        IList<ItemFields> videoDetailValues = videoDetail.Values;
        foreach (ItemFields innerFields in videoDetailValues)
        {
            if (innerFields.Contains("videoTitle"))
            {
                Headertext = innerFields["videoTitle"] as TextField;
            }
            if (innerFields.Contains("childPageName"))
            {
                XhtmlField childPageName = (XhtmlField)innerFields["childPageName"];
                childPageName.Value = component.Title;
            }
        }
    }
}
component.Content = componentFields.ToXml();
component.Save(true);

Answer 1

I too wasn't able to update the embedded Component field using ItemFields class; however, I was able to update it by XML node manipulation. Something like this should definitely work:

var xDocument = XDocument.Parse(component.Content.OuterXml);
var namespace = xDocument.Root.GetDefaultNamespace();

// Check if videoDetail embedded field exists
if (xDocument.Descendants(namespace + "videoDetail").Count() > 0)
{
    component.TryCheckOut();

    // Get videoDetail embedded field values
    var videoDetailValues = from videoDetail in
                            xDocument.Descendants(namespace + "videoDetail")
                            select videoDetail;

    foreach (XElement innerFields in videoDetailValues)
    {
        if (innerFields.Elements(namespace + "videoTitle").Any())
        {
            string headerText = innerFields.Elements(namespace +"videoTitle").FirstOrDefault().Value;
        }

        // Set childPageName embedded field value to the title of the Component
        if (innerFields.Elements(namespace + "childPageName").Any())
        {
            innerFields.SetElementValue(namespace + "childPageName", component.Title);
        }
    }    
}

var updatedContent = new XmlDocument();
updatedContent.LoadXml(xDocument.ToString());
component.Content = updatedContent.DocumentElement;
component.Save(true);

May be experts here can answer as to how this can be achieved using ItemFields class. I've tested this by subscribing to a Page check-in event -- EventSystem.Subscribe<Page, CheckInEventArgs>(HandleForPageCheckInEvent, EventPhases.TransactionCommitted);

Answer 2

It looks like you are trying to save innerFields as Component content. But isn't componentFields actual content of Component?

Also, please make notice that you are trying to do this in Event System. This begs the question in which phase, and under which EventArgs.

It is possible that your Event System is not working correctly. If you want to debug Event System, you can do that "easily" using this article.