Attaching a event receiver to a content type

Question

I created some site columns / a content type and a list definition as part of a feature. I want to attach an eventreceiver to the content type. I added code to attach the event receiver to the content type. Using spmanager i can see that the event receiver is attached to the content type however when i create lists from the content type the event reciever is missing. Any ideas. My code is below

  public override void FeatureActivated(SPFeatureReceiverProperties properties)
            {
                string asmName = System.Reflection.Assembly.GetExecutingAssembly().FullName;
                string itemReceiverName = "xxxxxx.Intranet.SP.xxxxx.PermissionsUpdaterEventReceiver";

                ////surely a better way to get all lists than this
                ////re - do
                using (SPSite thisSite = (SPSite)properties.Feature.Parent) {
                    using (SPWeb web = thisSite.RootWeb) {
                        SPContentType RambollNewsContentType = web.ContentTypes["RambollNewsContentType"];
                        RambollNewsContentType.EventReceivers.Add(SPEventReceiverType.ItemAdded, asmName, itemReceiverName);
                        RambollNewsContentType.Update(true);
                    }
                }    
            }

calorie712 calorie712 · Accepted Answer · 2014-01-17T16:18:05

I am using this successfully. I left in my logging and the logging method.

    /// <summary>
    /// This method is executed on feature activation.
    /// It attaches the event receiver to the content type.
    /// </summary>
    public override void FeatureActivated(SPFeatureReceiverProperties properties)
    {
        LogMessage("FeatureActivated - Start");
        SPSite site = (SPSite)properties.Feature.Parent;
        LogMessage("FeatureActivated - 1");
        SPWeb web = site.RootWeb;
        LogMessage("FeatureActivated - 2");
        //ListContentTypes(web);
        SPContentType ctype = web.ContentTypes["Wells Project Task List"];
        LogMessage("FeatureActivated - 3");
        LogMessage("ctype name: " + ctype.Name.ToString());
        if (ctype != null)
        {
            LogMessage("FeatureActivated - I have a content type. Web url: " + web.Url);
            SPEventReceiverDefinition er = ctype.EventReceivers.Add();
            er.Class = "Wells.SharePoint.ProjectManagementEventReceiver";
            er.Assembly = "ProjectManagementEventReceiver, Version=1.0.0.0, Culture=neutral, PublicKeyToken=a1cb21c41d80b7ae";
            er.Type = SPEventReceiverType.ItemAdded;
            er.Name = "ItemAdded";
            er.SequenceNumber = 10001;
            er.Update();
            ctype.Update(false);
            LogMessage("FeatureActivated - After ctype.update");
            web.Dispose();
        }
        else
            LogMessage("CT not found: " + web.Url);




        LogMessage("FeatureActivated - End");
    }

    static void ListContentTypes(SPWeb web)
    {
        foreach (SPContentType ct in web.ContentTypes)
        {
            LogMessage("CT: " + ct.Name.ToString());
        }
    }


    /// <summary>
    /// This method is executed on feature deactivation.
    /// It removes the event receiver from the content type
    /// </summary>
    /// <param name="properties"></param>
    public override void FeatureDeactivating(SPFeatureReceiverProperties properties)
    {
        LogMessage("Feature DeActivated  - Start");
        SPSite site = (SPSite)properties.Feature.Parent;
        SPWeb web = site.OpenWeb();
        SPContentType contentType = web.ContentTypes["NAME OF CONTENT TYPE"];
        if (contentType != null)
        {
            LogMessage("im have a content type. Web url: " + web.Url);
            int i;
            //Use the above integer to loop through the event recievers on the first list and delete the above assembly
            for (i = 0; i < contentType.EventReceivers.Count; i++)
            {
                LogMessage("ER Count: " + contentType.EventReceivers.Count);
                if (contentType.EventReceivers[i].Assembly.Contains("ProjectManagementEventReceiver"))
                {
                    contentType.EventReceivers[i].Delete();

                    LogMessage("Deleting event receiver from CT");


                }
            }
            contentType.Update();
        }
        else
            LogMessage("CT not found: " + web.Url);

        LogMessage("Feature DeActivated  - End");

    }

static void LogMessage(string msg)
    {
        StreamWriter wrtr = null;
        try
        {
            wrtr = new StreamWriter("C:\\Logs\\FeatureActivatedDeactivated.txt", true);
            wrtr.WriteLine(msg + "--[" + System.DateTime.Now.ToString() + "]" + Environment.NewLine);
            wrtr.WriteLine(Environment.NewLine + "==================================");
        }
        catch (Exception e)
        {
            throw e;
        }
        finally
        {
            if (wrtr != null)
            {
                wrtr.Close();
                wrtr.Dispose();
            }
        }
    }

Attaching a event receiver to a content type

2 Answers