Sunday, December 16, 2012

Read Only Entities in the Entity Framework

Recently I had a need in a project to have a few read-only entities because the tables didn't belong to my application. I didn't want to create views into those tables, I just wanted a read-only entity. If we set the entity's state such that it isn't tracked in the ObjectContext, then no changes would ever be persisted for it.

The following allows usage of context.States (ie states of the USA) but doesn't track any changes.

/// Using a dbquery since this is readonly.
/// </summary>
public DbQuery<State> States
{
  get
  {
    // Don't track changes to query results
    return Set<State>().AsNoTracking();
 }
}

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