Sharepoint event handler not firing

I have created an event handler for ItemAdded so that when an item is added on the site, my code checks to see if it's a folder. If it is, it should change the content type of that folder to a custom content type.

The event isn't firing, so I was wondering if I'm doing it the right way and/or in the right place. Here is my code:

public class ItemAddedHandler : SPItemEventReceiver
{
public override void ItemAdded(SPItemEventProperties properties)
{
    base.ItemAdded(properties);

    SPListItem listItem = properties.ListItem;
    SPList list = properties.ListItem.ParentList;
    SPContentType contentType;

    if (listItem.FileSystemObjectType == SPFileSystemObjectType.Folder &&
       (list.Title == "Apps" || list.Title == "Data" || list.Title == "Public"))
    {
        contentType = list.ContentTypes["Custom Folder"];

        listItem["Content Type"] = contentType.Name;
        listItem["Content Type ID"] = contentType.Id.ToString();
        listItem.SystemUpdate();
    }
}
}

Please let me know if I'm doing anything wrong to accomplish this task. Thanks very much in advance.

As requested, the feature was adding with the following method:

1. Signed and compiled above code and copied DLL to server
2. Copied DLL to GAC

3. Created folder: C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\FEATURES\SPEventHandler 4.Created Feature.xml using GUID generated with Visual Studio:

   <?xml version="1.0" encoding="utf-8" ?>
   <Feature Scope="Web" 
     Title="Added Event Handler" 
     Id="{27C2FDFF-ADA0-4984-955C-6448E182FA88}" 
     xmlns="http://schemas.microsoft.com/sharepoint/">
     <ElementManifests>
       <ElementManifest Location="Elements.xml"/>
     </ElementManifests>
   </Feature>
   

5.Created Elements.xml using PublicKeyToken of DLL in GAC and ListTemplateID for working with a document library (101):

    <?xml version="1.0" encoding="utf-8" ?>
    <Elements xmlns="http://schemas.microsoft.com/sharepoint/">
      <Receivers ListTemplateId="101">
        <Receiver>
          <Name>AddedEventHandler</Name>
          <Type>ItemAdded</Type>
          <SequenceNumber>10000</开发者_JAVA技巧SequenceNumber>
          <Assembly>SPEventHandler, Version=1.0.0.0, Culture=neutral, 
              PublicKeyToken=f2e7de6c4a924a03</Assembly>
          <Class>SPEventHandler.ItemAddedHandler</Class>
          <Data></Data>
          <Filter></Filter>
        </Receiver>
      </Receivers>
    </Elements>

1. Ran the following command on the server:

   stsadm -o installfeature -filename SPEventHandler\Feature.xml

2. On the site (SP 2007), Site Actions -> Site Settings -> Modify All Site Settings -> Site features and activated "Added Event Handler"

After these steps, creating a new item in a list on this site does not seem to do anything, including writing to the event log, so I'm wondering if it is even getting run at all.

Thanks

---

I figured it out. My custom content type needed to be enabled for the document library before an item could be given that content type. Thanks everyone for your responses.