An error in the EF 4.0 update data and its handling

Error

You can update the method after you modify it. But one more step in the middle of the query

 /// <summary>        ///Update a product category/// </summary>        /// <param name= "model" ></param>        /// <returns></returns>         Public BOOLUpdatebindclass (datadiccontent model) {varEntry =dbent.            Entry (model); if(Entry. state = =entitystate.detached) {var Set= Dbent. Set<datadiccontent>(); Datadiccontent attachedproduct=Set. Local.singleordefault (P =>p.id==model.id); //If the context is already being traced                if(Attachedproduct! =NULL)                {                    varAttachedentry =dbent.                    Entry (attachedproduct);                AttachedEntry.CurrentValues.SetValues (model); }                Else //If you are not tracking the current context{entry. State=entitystate.modified; }            }            if(Dbent. SaveChanges () >0)            {                return true; }            return false; }

Strangely enough, I don't know why I used the original method to make a mistake.

Other table updates are written in the same way without errors.
There is no time to delve into the cause of the error, first find a solution to the problem, and so on time to delve into it.

An error in the EF 4.0 update data and its handling