Been playing around with Umbraco Linq in 4.5.2 and am impressed with the code-gen and the concept. It's going to be immense! But I've (inevitably) got a problem... I created two classes (interfaces and concrete) using the export function on DocTypes.

All works well when enumerating a document type. For instance, this code works great:

using (MyUmbracoDataContext uContext = new MyUmbraco.MyUmbracoDataContext())
{
  foreach (var item in uContext.Articles)
   {
     Response.Write(item.NodeName + "<br />");
   }
}

However, if I try and access the type's children then I always get an exception. Both the following statements will cause a FormatException:

foreach (var item in uContext.Articles)
{
   int count = item.Articles.Count();
    int children = item.Children.Count();
}

The exception that is raised is:

[FormatException: Input string was not in a correct format.]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +7471479
   System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +119
   System.String.System.IConvertible.ToInt32(IFormatProvider provider) +46
   System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider) +373
   System.Convert.ChangeType(Object value, Type conversionType) +32
   umbraco.Linq.Core.Node.NodeDataProvider.LoadFromXml(XElement xml, T node) +2415
   umbraco.Linq.Core.Node.<DynamicNodeCreation>d__6.MoveNext() +468
   System.Linq.WhereEnumerableIterator`1.MoveNext() +191
   System.Linq.<CastIterator>d__aa`1.MoveNext() +181
   System.Linq.Enumerable.Count(IEnumerable`1 source) +213
   umbraco_LinqTest.Page_Load(Object sender, EventArgs e) in d:\xxx\xxxx\WWW\umbraco\LinqTest.aspx.cs:17
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +50
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627
 

This happens for all AssociationTree<> types for every document type, not just Article.

The generated IMaster interface looks like this:

public partial interface IMaster : IDocTypeBase
{
   String HeadingText { get; set; }
  String SubHeading { get; set; }
   String Tags { get; set; }
 String BodyText { get; set; }
 Int32? Image { get; set; }
    String CssClass { get; set; }
 Int32? QuotePageId { get; set; }
  String ImageUrl { get; set; }
 String RelatedLinks { get; set; }
 Int32? LastFmEvents { get; set; }
 String BrowserTitle { get; set; }
 String SummaryText { get; set; }
  String CalaisMetaData { get; set; }
   Int32? UmbracoNaviHide { get; set; }
  Int32? HidePage { get; set; }
 String UmbracoUrlName { get; set; }
}

And the IArticle interface looks like this:

public partial interface IArticle : IMaster
{
   IEnumerable<IArticle> Articles { get; }
 IEnumerable<IContactForm> ContactForms { get; }
 IEnumerable<IGallery> Gallerys { get; }
 IEnumerable<ILinksList> LinksLists { get; }
 IEnumerable<IListingPage> ListingPages { get; }
 IEnumerable<ILoveFilm> LoveFilms { get; }
   IEnumerable<IMp3Player> Mp3Players { get; }
 IEnumerable<IMusicPage> MusicPages { get; }
 IEnumerable<IQuotes> Quotess { get; }
   IEnumerable<IRSSFeedListing> RSSFeedListings { get; }
   IEnumerable<IYouTubeListing> YouTubeListings { get; }
}

 Any help appreciated! If you need examples of any XML or whatever I can supply them. Thanks.