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POentity framework - working with several edmx files
 

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  1. POentity framework - working with several edmx files
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    <p>I am using entity framework 4 and I have many tables (500). My edmx file is very large and I find it really hard to open it and make changes on it. I found that in my project there are "groups" of tables that related to specific business so I would like to saperate the edmx into several files. I am using repository pattern and unit of work pattern and work with POCOs this way:</p> <pre><code>This is my container public partial class MyEntities : ObjectContext { #region Private Methods private void SetContextOptions() { ContextOptions.LazyLoadingEnabled = false; } #endregion #region Constructors public MyEntities() : base("name=MyConnection", "MyEntities") { SetContextOptions(); OnContextCreated(); } #endregion #region Partial Methods partial void OnContextCreated(); #endregion } </code></pre> <p>For each edmx I will set the Entity Container Name property to MyEntities. This is my generic repository:</p> <pre><code>public class Repository&lt;T&gt; : IRepository&lt;T&gt; where T : class, IDataEntity { ObjectContext _context; IObjectSet&lt;T&gt; _objectSet; protected ObjectContext Context { get { if (_context == null) { _context = GetCurrentUnitOfWork&lt;EFUnitOfWork&gt;().Context; } return _context; } } protected IObjectSet&lt;T&gt; ObjectSet { get { if (_objectSet == null) { _objectSet = this.Context.CreateObjectSet&lt;T&gt;(); } return _objectSet; } } public TUnitOfWork GetCurrentUnitOfWork&lt;TUnitOfWork&gt;() where TUnitOfWork : IUnitOfWork { return (TUnitOfWork)UnitOfWork.Current; } public virtual IQueryable&lt;T&gt; GetQuery(IEnumerable&lt;Expression&lt;Func&lt;T, object&gt;&gt;&gt; includes) { return ObjectSet.IncludeMultiple(includes); } public virtual IPaged&lt;T&gt; GetQuery(IQueryable&lt;T&gt; query, Func&lt;IQueryable&lt;T&gt;, IOrderedQueryable&lt;T&gt;&gt; orderBy, int pageNumber, int pageSize) { if (orderBy != null) { query = orderBy(query); } IPaged&lt;T&gt; page = new Paged&lt;T&gt;(query, pageNumber, pageSize); return page; } public virtual IPaged&lt;T&gt; GetQuery(IEnumerable&lt;T&gt; query, Func&lt;IEnumerable&lt;T&gt;, IOrderedEnumerable&lt;T&gt;&gt; orderBy, int pageNumber, int pageSize) { if (orderBy != null) { query = orderBy(query); } IPaged&lt;T&gt; page = new Paged&lt;T&gt;(query, pageNumber, pageSize); return page; } public virtual IEnumerable&lt;T&gt; GetObjectStateManagerChanges() { return this.Context.ObjectStateManager. GetObjectStateEntries(EntityState.Added | EntityState.Modified). Select(e =&gt; e.Entity). OfType&lt;T&gt;(); } public virtual void Insert(T entity) { this.ObjectSet.AddObject(entity); } public virtual void Delete(T entity) { this.ObjectSet.DeleteObject(entity); } public virtual void MarkModified(T entity) { this.Context.ObjectStateManager.ChangeObjectState(entity, EntityState.Modified); } public virtual void Attach(T entity) { ObjectStateEntry entry = null; if (this.Context.ObjectStateManager.TryGetObjectStateEntry(entity, out entry) == false) { this.ObjectSet.Attach(entity); } } public virtual void Detach(T entity) { ObjectStateEntry entry = null; if (this.Context.ObjectStateManager.TryGetObjectStateEntry(entity, out entry) == true) { this.ObjectSet.Detach(entity); } } public virtual T GetOriginalEntity(Func&lt;T, bool&gt; predicate) { T originalEntity = null; EFUnitOfWorkFactory factory = new EFUnitOfWorkFactory(); using (EFUnitOfWork uow = (EFUnitOfWork)factory.Create()) { originalEntity = uow.Context.CreateObjectSet&lt;T&gt;().Single(predicate); } return originalEntity; } } </code></pre> <p>And this is my unit of work implementation:</p> <pre><code> public class EFUnitOfWorkFactory : IUnitOfWorkFactory { private static int Counter = 0; private static Func&lt;ObjectContext&gt; _objectContextDelegate; private static readonly Object _lockObject = new object(); public static void SetObjectContext(Func&lt;ObjectContext&gt; objectContextDelegate) { _objectContextDelegate = objectContextDelegate; } public IUnitOfWork Create() { ObjectContext context; lock (_lockObject) { Counter++; context = _objectContextDelegate(); } return new EFUnitOfWork(context, Counter); } } public class EFUnitOfWork : IUnitOfWork, IDisposable { public ObjectContext Context { get; private set; } public int Id { get; private set; } public EFUnitOfWork(ObjectContext context, int id) { Id = id; Context = context; Context.ContextOptions.LazyLoadingEnabled = false; } public int Commit() { return Context.SaveChanges(); } public void Dispose() { if (Context != null) { Context.Dispose(); Context = null; } GC.SuppressFinalize(this); } } </code></pre> <p>will my plan work to divide the edmx work with this code? What is the best practices for my case (I have read the two parts of <a href="http://blogs.msdn.com/b/adonet/archive/2008/11/24/working-with-large-models-in-entity-framework-part-1.aspx" rel="nofollow">http://blogs.msdn.com/b/adonet/archive/2008/11/24/working-with-large-models-in-entity-framework-part-1.aspx</a>)? </p> <p><strong>EDIT:</strong> When trying to set the entity container names of the edmxs to MyEntities, I get: </p> <pre><code>EntityContainer name 'MyEntities' is already in use by another Entity Data Model in the project. </code></pre> <p>Is there any workaround?</p>
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    1. COHere is a very good answer with links on how to do it: http://stackoverflow.com/questions/3867479/entity-framework-4-does-it-make-sense-to-create-a-single-diagram-for-all-entiti/3868075#3868075
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    2. CO@RyanDrost: This answer is exactly what I already read . I don't find it's solution practical enough.
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    3. CO@RyanDrost: The solution you provided doesn't use poco, repository pattern and not unit of work. Moreover, it is the same as creating several edmxs, just with reuse of the csdl.
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