Sub sites inherit parent theme

Question

I am trying to get subsites of my parent site to inherit the same masterpage as their parent. I have a feature stapled to all the default site templates that contain my master page.

I have created a Event Receiver called ChildSiteInit. It has the following code:

using Microsoft.SharePoint;

namespace SP_Intranet.ChildSiteInit
{
    public class ChildSiteInit : SPWebEventReceiver
    {
        public override void WebProvisioned(SPWebEventProperties properties)
        {
            SPWeb childSite = properties.Web;
            SPWeb topSite = childSite.Site.RootWeb;
            childSite.MasterUrl = topSite.MasterUrl;
            childSite.CustomMasterUrl = topSite.CustomMasterUrl;
            childSite.AlternateCssUrl = topSite.AlternateCssUrl;
            childSite.SiteLogoUrl = topSite.SiteLogoUrl;
            childSite.Update();
        }
    }
}

This is taken from Inside Microsoft SharePoint 2010 (direct copy bar the namespace).

It is displayed in my feature and the feature is deployed. The feature is deployed at site collection level.

When I create a new sub site the parent masterpage is not inherited.

Updated code removing usings

Answer 1

Is this in a sandboxed solution?

Is this in a Publishing Site?

Also, remove the unneeded usings (right click the code, Organise Usings) - Security, Utilities, Workflow. Keeps the code cleaner a bit.

The code itself looks fine, try putting a breakpoint on the first line and debug, see if it bails out at any point and gives you clues as to why (I currently have a problem trying to set the Navigation settings of a Publishing site using the exact same event receiver, and it's bailing out, as I think the sandboxed environment can't handle it. I had to debug to reveal this).