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If I try to persist the detached object (due to the fact that it doen't have any Entity Key) it doesn't update the persisted object but it insert a new object.

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I ended up preloading the object graph using different techniques.Am i wrong if i say that this method makes STE's absolutely useless?! Collect Relational Members(Expression exp, IList`1 members) in C:\projects\GEC\Code Project. Data\Entity\Object Context Extension.cs:line 100 at Code Project. NET compiler translated lambda expressions compared to the C# compiler.Now i can just come back from client with the tree and use this method and everything is fine! Self Tracking Entities (STE) are an application of the Unit of Work design pattern, similar to the now obsolete Entitybag I mention in my article. I suppose that is caused by some conversion from to c#. Collect Relational Members(Expression exp, IList`1 members) in C:\projects\GEC\Code Project. Data\Entity\Entity Framework Helper.cs:line 16 at Code Project. Having the Invalid Operation Exception("Invalid type of exception") means you came in the 'default' case of the switch expression in the Collect Relational Members method, as you were aware. Just to check, you say your code is: Get DBEntities(). Attach Object Graph(to Create, Function(e) e.edificio. Without Update(), Function(r) r.ruolo, Function(p) p.ruolo.persona. Without Update()) And finally, have you tried the latest version of the code ?I still need to submit a patch, I think, for the two issues I mentioned.However a third issue - the need to allow multiple Association End Behavior attributes - has been fixed in the codeplex version.Now i have an easy to use way to attach graphs, but can enable lazy loading yay! STE is a different approach than my Attach Object Graph method, and if you use one approach, the other becomes needless indeed. My call to your code is something like Get DBEntities(). Collect Relational Members(Expression exp, IList`1 members) in C:\projects\GEC\Code Project. Data\Entity\Entity Framework Helper.cs:line 35 at Code Project. What is the node type of the expression of its not one of the foreseen cases ? Attach Object Graph(to Create, Function(e) e.edificio. Without Update, Function(r) r.ruolo, Function(p) p.ruolo.persona. It's available on Code Plex: Kind regards Rudi Breedenraedt Hi Rudi, I have tested te latest version from codeplex and it works fine.I guess STE also will have its advocates, but I have seen projects using STE fail due to the complexity in use and the lack of control of the transaction actions. Yes indeed, we tried using them too, but the lack of lazyloading and therefore your forced to use tons of includes in your business logic. Attach Object Graph(to Create, Function(e) e.edificio. Without Update, Function(r) r.ruolo, Function(p) p.ruolo.persona. Without Update) Get DBEntities() returns the context to Create is the root object first I have got to change as you see public static string Get Entity Set Name(this Object Context context, Type entity Type) and now it works for me. Data\Entity\Entity Framework Helper.cs:line 49 at Code Project. I see that has been fixed the expression error (there is a 'Convert' case switch that manage VB. Bw Markus This forum may be used only to ask questions and give answers for Sobi Pro component and its applications.If you have membership-related questions, please use the contact form.URL: https://soulmates.uk/ Putting a price on love: A minimum of £16 a month.By sharing it in the comments section below you’ll help out some other seniors.

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