using System;
using System.IO;
using System.Text;
using System.Windows.Forms;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Taxonomy;

class Taxonomy_Fix
{
    public static StringBuilder sb = new StringBuilder();
    public static string nl = "\r\n";
    public static string url = "http://intranet";

    public static void FIXALL()
    {
        using (SPSite site = new SPSite(url))
        {
            foreach (SPWeb web in site.AllWebs)
            {
                FixTaxonomyReceiverOnWebLists(web);

                web.Close();
            }
        }

        File.AppendAllText(String.Format("c:\\{0:HH_mm_ss}.txt", DateTime.Now), sb.ToString());
        MessageBox.Show(sb.ToString());
    }

    private static void FixTaxonomyReceiverOnWebLists(SPWeb web)
    {
        for (int i = 0; i < web.Lists.Count; i++)
        {
            SPList list = web.Lists[i];
            if (HasTaxonomyField(list))
            {
                sb.AppendFormat("{0}{1} has Taxonomy Field{2}", url, list.RootFolder.ServerRelativeUrl, nl);
                EnsureTaxonomyHandlers(list);
            }
        }
    }

    private static bool HasTaxonomyField(SPList list)
    {
        bool result = false;

        foreach (SPField field in list.Fields)
        {
            if (field is TaxonomyField)
            {
                result = true;
                break;
            }
        }

        return result;
    }

    private static void EnsureTaxonomyHandlers(SPList list)
    {
        AddEventReceiverIfNotExists(list.EventReceivers, SPEventReceiverType.ItemAdding, typeof(TaxonomyField).Assembly.FullName, "Microsoft.SharePoint.Taxonomy.TaxonomyItemEventReceiver", "TaxonomyItemSynchronousAddedEventReceiver", SPEventReceiverSynchronization.Synchronous);
        AddEventReceiverIfNotExists(list.EventReceivers, SPEventReceiverType.ItemUpdating, typeof(TaxonomyField).Assembly.FullName, "Microsoft.SharePoint.Taxonomy.TaxonomyItemEventReceiver", "TaxonomyItemUpdatingEventReceiver", SPEventReceiverSynchronization.Synchronous);
    }

    private static void AddEventReceiverIfNotExists(SPEventReceiverDefinitionCollection eventReceiverCollection, SPEventReceiverType type, string assembly, string className, string receiverName, SPEventReceiverSynchronization sync)
    {
        if (eventReceiverCollection == null)
        {
            throw new ArgumentNullException("eventReceiverCollection");
        }
        if (string.IsNullOrEmpty(assembly))
        {
            throw new ArgumentNullException("Valid assembly name required");
        }
        foreach (SPEventReceiverDefinition erd in eventReceiverCollection)
        {
            if (erd.Assembly == assembly && className == erd.Class && type == erd.Type && erd.Synchronization == sync)
            {
                sb.AppendFormat("\t>> no action required{0}", nl);
                return;
            }
        }

        SPEventReceiverDefinition erd2 = eventReceiverCollection.Add();
        erd2.Name = receiverName;
        erd2.Type = type;
        erd2.Assembly = assembly;
        erd2.Class = className;
        erd2.Synchronization = sync;
        erd2.Update();
        sb.AppendFormat("\t>> Added TaxonomyEvent Receiver{0}", nl);
    }
}