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    <p>What we did at work was to implement a pattern like this:</p> <pre><code>interface ICRUD&lt;T&gt; : ICreatable&lt;T&gt;, IRetrievable&lt;T&gt;, IUpdatable&lt;T&gt;, IDeletable&lt;T&gt; { } interface ICreatable&lt;T&gt; { T Create(); } interface IRetrieve&lt;T&gt; { T Retrieve(params object[] keys); } interface IUpdatable&lt;T&gt; { void Update(T existing); } interface ICreatable&lt;T&gt; { void Delete(T existing); } </code></pre> <p>And then we created an Entity-powered base repository:</p> <pre><code>public abstract class BaseRepository&lt;TModel, TEntities&gt; where TEntities : IDbSet&lt;TModel&gt; { protected TEntities Entities {get; set;} protected DbContext Db {get; set;} public BaseRepository (DbContext db, TEntities entities) { Db = db; Entities = entities; } public virtual TModel Create() { return Entities.Create (); } public virtual TModel Retrieve (params object[] keys) { return Entities.Find (keys); } public virtual void Update (TModel existing) { Db.Entry(existing).State = Modified; } public virtual void Delete (TModel existing) { Db.Entry(existing).State = Removed; } } </code></pre> <p>If you notice, the BaseRepository doesn't actually use ICRUD, just has identical method signatures. Since we code to interfaces, this lets us use a lot of shared code without exposing functionality we don't want with the base classes. A developer is free to implement the data store however they wish (ICRUD can talk to a webservice, for instance) with no knowledge of Entity, or they're also free to augment behavior provided by the BaseRepository by overriding any of the provided methods and doing something differently.</p>
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    1. POEntity Framework - How to implement a Repository, using a custom DbContext?
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    1. USBryan Boettcher
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    1. COThat's.... over-engineering, IMHO. No need to create a contract for every CRUD operation
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      1. USRui Jarimba
    2. COHow is it overengineered? We created four contracts, ICreatable being one, and thanks to generics in C# we can apply it to any of our domain models. It allows us to spin up a DI'ed, fully mockable repository in as few as 9 lines, including curly braces.
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    3. COI just don't see the need to create 4 contracts, I would create only one: ` interface ICRUD<T> { T Create(); T Retrieve(params object[] keys); void Update(T existing); void Delete(T existing); } `
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