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18231996
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2013-08-14T12:38:51.307
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2013-08-14T13:14:59.640
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Actually you are talking about <code>AddObject</code> method of <code>ObjectSet<TEntity></code> class which was used by old <code>ObjectContext</code>. But since Entity Framework 4 we have <code>DbContext</code> class (which is a wrapper over old <code>ObjectContext</code>). This new class uses <code>DbSet<TEntity></code> instead of old <code>ObjectSet<TEntity></code>. New set class has method <code>Add</code>. So, back to differences. Old implementation invoked <code>AddObject</code> method of <code>ObjectContext</code>: <pre><code>public void AddObject(TEntity entity) { Context.AddObject(FullyQualifiedEntitySetName, entity); } </code></pre> New implementation does same thing (see action parameter): <pre><code>public virtual void Add(object entity) { ActOnSet(() => ((InternalSet<TEntity>) this).InternalContext.ObjectContext.AddObject(((InternalSet<TEntity>) this).EntitySetName, entity), EntityState.Added, entity, "Add"); } </code></pre> As you can see same <code>ObjectContext.AddObject</code> method is called internally. What was changed - previously we just added entity to context, but now if there is state entry exists in ObjectStateManager, then we just changing state of entry to <code>Added</code>: <pre><code>if (InternalContext.ObjectContext.ObjectStateManager.TryGetObjectStateEntry(entity, out entry)) { entry.ChangeState(newState); // just change state } else { action(); // invoke ObjectContext.AddObject } </code></pre> Main goal of new API is making <code>DbContext</code> easier to use.
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1. POWhat is difference between dbcontext.Add and dbcontext.AddObject
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1. USSergey Berezovskiy
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1. USSergey Berezovskiy
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1. COPlease note that the problems the OP has are the result of calling AddObject on the DbSet<T> and not on the context. Maybe you can elaborate your answer with showing how to use both, by calling ObjectContext.AddObject("Names", nameEntityToAdd) and DbContext.Names.Add(nameEntityToAdd)
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