using System;
using System.Collections.Generic;
using Microsoft.SharePoint;

namespace SharePoint2010DevConsoleApp
{
  class Program
  {
    public static SPList TryGetListFromWeb(SPWeb web, string listUrl)
    {
      Console.WriteLine(string.Format("Looking for list {0} on web {1}.", listUrl, web.Url));

      //int websCount = web.Webs.Count; //This line of code is purely to stop the infinite loop bug that calling web.GetList seems to cause.
      SPList returnList = null;

      try
      {
        returnList = web.GetList(listUrl);

        Console.WriteLine("List found");
      }
      catch
      {
        returnList = null;
        Console.WriteLine("List not found");
      }

      return returnList;
    }

    public static void PropogateContentTypeChangesOnWeb(SPWeb web, SPContentType sourceContentType, bool updateFields, bool removeFields)
    {
      Console.WriteLine("PropogateContentTypeChangesOnWeb: " + web.Url);

      IList<SPContentTypeUsage> sourceContentTypeUsages = SPContentTypeUsage.GetUsages(sourceContentType);

      if (sourceContentTypeUsages.Count > 0)
      {
        foreach (SPContentTypeUsage usage in sourceContentTypeUsages)
        {
          if (usage.IsUrlToList)
          {
            SPList list = TryGetListFromWeb(web, usage.Url);
          }
        }
      }

      //Process sub webs
      foreach (SPWeb subWeb in web.Webs)
      {
        PropogateContentTypeChangesOnWeb(subWeb, sourceContentType, updateFields, removeFields);
        subWeb.Dispose();
      }
    }

    static void Main(string[] args)
    {
      string siteAddress = "http://localhost";

      using (SPSite site = new SPSite(siteAddress))
      {
        using (SPWeb currentWeb = site.OpenWeb())
        {
          SPContentType pageCommentContentType = currentWeb.ContentTypes["Page Comment"];

          if (pageCommentContentType != null) // We have a content type
          {
            PropogateContentTypeChangesOnWeb(currentWeb, pageCommentContentType, true, false);
          }
          else // No content type is found.
          {
            Console.WriteLine("The content type does not exist in this site collection.");
          }
        }
      }
    }
  }
}