Add object to Context EntityFramework 4 without SaveChanges

Question

Is there a way to add object to de dataContext without committing the changes, when I use

ctx.Articles.AddObject(newart);

the newart doesn't appear inth e context ctx, the only way i was able to do that is by saveing changes ctx.SaveChanges , unfortunatly that save changes to the DB, & i don't want to, is there a way to do that, Any help will be appreciated

Answer 1

May work in EF4

You should be able to get all currently tracked objects via the ObjectStateManager of your ObjectContext like

var articles = ctx.ObjectStateManager
                    // Get all entries for added/changed/modified entities
                    .GetObjectStateEntries(EntityState.Added |
                                           EntityState.Unchanged |
                                           EntityState.Modified)
                    // select the entity objects from the entries
                    .Select(entry=>entry.Entity)
                    // we're only interested in Article objects
                    .OfType<Article>();

Note: Since I haven't installed EF4 so I couldn't verify this solution. But I remember darkly having done this successfully some time ago :). It might not be very performant when done with very large object sets though ...

Works for EF 5

You can use theLocal Property of the DbSet class. This property represents the object currently tracked by the Context (i.e. all objects that are currently loaded and/or locally added without those being deleted). Accessing the Local property never does a DB query.

So you can use ctx.Articles.Local and get a data set which contains your newart object (along with any objects loaded by previous queries)