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copied!<blockquote> <p>Why does proxy creation have to be enabled when lazy loading is enabled?</p> </blockquote> <p>Because lazy loading with POCOs relies on proxy creation. Without proxies lazy loading doesn't work. Therefore the combination <code>ProxyCreationEnabled = false</code> and <code>LazyLoadingEnabled = true</code> makes no sense. The reverse combination makes sense, in case you want to work with change tracking proxies but don't want to use lazy loading.</p> <blockquote> <p>If I want to set lazyloading = false, can I cast my IEnumerable in Service layer to ObjectQuery in order to use .Include() there?</p> </blockquote> <p>It depends on what your <code>IEnumerable<T></code> really <em>is</em>. If it's the result of a <code>ToList()</code> then no (because <code>List<T></code> is an implementation of <code>IEnumerable<T></code> but not of <code>IQueryable<T></code>.). If you just return an <code>IQueryable<T></code> as <code>IEnumerable<T></code> you probably can cast to <code>IQueryable<T></code>. (In EF 4.3 you would use <code>IQueryable<T></code> or <code>DbQuery<T></code> rather than <code>ObjectQuery<T></code>.)</p> <p>But imho the need for such a cast indicates that something is wrong in your architecture. Using <code>Include</code> is a modification of a query. If your service layer is allowed to modify queries your repository should return <code>IQueryable<T></code> - this type is made for building and modifying queries.</p> <p>If your repository is not supposed to return <code>IQueryable<T></code> you must pass in an expression or a specification into the repository methods which is used to add an <code>Include</code> to your query - inside of the repository method, not in the service layer.</p>

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