net core repository pattern with entity framework

Posted on November 7, 2022 by

Lets Keep Repositories Away for a Moment. With the Caching and Hangfire done, most of the complex parts of the implementation are taken care of. Thank you for visiting. As a result, all repositories share the same context instance. Hi Mukesh, Otherwise, you can find my other posts on Medium and Tumblr. I have a question about the method GetAll(). Task AddAsync (T entity); Necessary cookies are absolutely essential for the website to function properly. Inorder to wrap all the Repositories to a Single Object, we use Unit Of Work. { Yes, since the Repository pattern implementation depends on the develops choice, it can still be clean with a UOW Layer. Go to the DataAccess Project and under Repositories folder, add a new class, DeveloperRepository. Not very ideal to write this code over and over again, right? For some common errors and how to solve them, see Errors and Workarounds. I will try using this approach and if it works then this will become my new design pattern. Here T is the specific class. In this video, we will discuss Repository Pattern with Entity Framework in ASP.NET Core 6.0 [GitHub Source] https://github.com/executeautomation/ASPNETCore_. In our case, we are using Entity framework and we need to access data from SQL Server. The unit of work class coordinates the work of multiple repositories by creating a single database context class shared by all of them. Several years ago I was developing with Symfony 2 framework. Thankyou. services.AddTransient(); If not, what is the reason to keep the repositories? Please also do visit my Blog Page for my other ASP.NET Core tutorials. In the rest of the class, all references to the database context are replaced by references to the appropriate repository, using UnitOfWork properties to access the repository. First up, lets add a new folder Interfaces in our Domain Project. Line #3 Using the _unitofWork object, we are able to acces the custom method GetPopularDeveloper we created. This is one of the most debated topics within the .NET Core Community. { Name our application GameApplication. The great thing about DbContext class is that it's generic and therefore supports generics on methods that we will use to interact with the database. Great article. You can notice that we have not implemented all the 7 functions here, as it is is already implemented in our Generic Repository. Open Visual Studio Code terminal and execute the command below. Create a DBContext class inside Models folder name it AppDBContext, this class handles the Database connection. So why create new class and interface for Project? If each uses a separate database context instance, one might succeed and the other might fail. Lets say that you have a requirement to insert a new Developer and a new Project within the same transaction. return entityEntry.Entity; When ToPagedList is called on an IQueryable object, the query sent to SQL Server specifies the search string, and as a result only rows that meet the search criteria are returned, and no filtering needs to be done in memory. Finally we have a Complete Function which will save the changes to the database. Ps, This is a very basic setup of Entity Framework Core. The constructor accepts a database context instance and initializes the entity set variable. Inheriting and Extending the Generic Repository. We can view this article's sample on TechNet Gallery. Create a new project -> Web -> Visual Studio 2012. Instead of 4. }. You've now created an abstraction layer between the controller and the Entity Framework database context. As you saw in the Handling Concurrency tutorial, for concurrency handling you need a Delete method that takes an entity instance that includes the original value of a tracking property. The code in the GetByID, Insert, and Update methods is similar to what you saw in the non-generic repository. (client side) blazor page httpclient service ==> (server side) api controller return answer, I heard that AddScoped, AddTransient, AddSingleton has some reason to use. Repository Pattern With ASP.NET MVC And Entity Framework. With the Repository pattern, we create an abstraction layer between the data access and the business logic layer of an application. Read more here https://docs.microsoft.com/en-us/dotnet/architecture/microservices/microservice-ddd-cqrs-patterns/infrastructure-persistence-layer-implemenation-entity-framework-core#using-a-custom-repository-versus-using-ef-dbcontext-directly. Here is how our Solution would look like now. Its very nice! Hi .. This website uses cookies to improve your experience while you navigate through the website. Unit of Work is responsible for exposing the available Repositories and to Commit Changes to the DataSource ensuring a full transaction, without loss of data. Building generic repository. The repository and unit of work patterns are intended to create an abstraction layer between the data access layer and the business logic layer of an application. In this post, I will show you how to implement ASP.NET Core Entity Framework Repository Pattern in a WEB API if you are not familiar with ASP.NET Core web API, No need to worry I will show you how to do that using the steps below. 1. It has served me to acquire knowledge about architecture in detail. You can also build an abstraction layer into your database context class by using IDbSet interfaces there instead of DbSet types for your entity sets. Setup Database Connection for Entity Framework, III. For more information about the repository pattern, see the following resources: There are many ways to implement the repository and unit of work patterns. This command will create a Migrations folder and class that contains SQL scripts for Database tables, which in this case is the member table. Saves a lot of lines, yeah? public IEnumerable<T> ExecWithStoreProcedure (string query, params object [] parameters) { return _context.Database.SqlQuery<T> (query, parameters); } And then you can call it with any unitofwork/repository like. Repository design patterns fit into any NoSQL or Relational DB requirements and also can be used for multiple other requirements. Now, lets say we need two endpoints for this controller. If not, how can i fix it ? This way, you can completely avoid writing lines and lines of injections to your controllers. If not, it instantiates the repository, passing in the context instance. For information about the tutorial series, see the first tutorial in the series. Lets implement Repository Pattern in an ASP.NET Core WebApi Project. Thanks. Understanding and working with ASP.NET Core 6.0 Minimal API. The following section shows how to implement repository methods that enable you to specify that this work should be done by the database. using (var context = new BloggingContext()) In this approach, we create a database that uses Entity Framework to create domain objects and build code on top of that. The IGenericRepository interface is a generic interface that defines the same set of methods as before. In the DAL folder, create a class file named StudentRepository.cs file. Repository pattern is quite famous pattern in .NET world while accessing backend data using ORM (Object-Relational Mapping) system such as Entity framework. Task RemoveRangeAsync (IEnumerable entities); For example, suppose you have to update two different entity types as part of the same transaction. If you implement one for each type, you can use separate classes, a generic base class and derived classes, or an abstract base class and derived classes. In this tutorial you'll see some ways to use the repository and unit of work patterns for CRUD operations. Func, IOrderedQueryable> orderBy also means that a lambda expression will be provided. However, to keep the tutorial simple, you'll create and use these classes without interfaces. It depends on both the projects. This method create the Database and tables from the migration file that we created in step 6. You can see at https://github.com/dotnet-architecture/eShopOnWeb/blob/master/src/Web/Features/MyOrders/GetMyOrdersHandler.cs that they themselves are using Repository Pattern along with CQRS. Usage of design patterns solely depends on the developer. 2. So please tell me what I do further, https://altkomsoftware.pl/en/blog/create-better-code-using-domain-driven-design/, In domain driven design a repository is not just a data access object, which implements all CRUD and database queries needed for given entity type. Till now, we have built a couple of repositories. I was using simple pattern. Yet we write it multiple times over and over. Put the code below inside ConfigureServices method. These cookies will be stored in your browser only with your consent. De-couples the application from the Data Access Layer, Implementing Repository Pattern in ASP.NET Core 3.1. The Repository Pattern is Dead If You Use Entity Framework That is, it's dead if you are using Entity Framework Core. Very good for those who likes to use this pattern without diving deep to the theory of patterns and what each part does, All blogs are super This class will implement the IGenericRepository Interface. Understood why we used a Generic Repository instead of a IDevloperRepository?? Service layer and project structure in ASP.NET MVC 5 without repository and UoW patterns. Give it a look to learn more. The input of this expression is an IQueryable object and it will return an ordered version of that object. Thanks, Mukesh. The Repository Pattern allows us to create an abstraction layer between the data access layer and the business logic layer of an application. The Repository Pattern, as well as the Unit of Work Pattern . services.AddTransient(); Learn on the go with our new app. Below is a sample postman request. This is a series: Part 1: Analysing whether Repository pattern useful with Entity Framework (this article).Part 2: Four months on - my solution to replacing the Repository pattern. Replace the existing code with the following code, which implements the IStudentRepository interface: The database context is defined in a class variable, and the constructor expects the calling object to pass in an instance of the context: You could instantiate a new context in the repository, but then if you used multiple repositories in one controller, each would end up with a separate context. I have used the Repository pattern in my project without Unit of Work, and I am getting below exception when I can try to do multiple database operations in the same service. Thanks , Hi Mukesh, i will be using VS own unit test framew Yes, Thanks for pointing out that to me. What about using a generic UnitOfWork Pattern. Create a new project -> Web -> Visual Studio 2012. . Thus we made a generic repository that holds the most commonly used implementaions. Thus, our application will not care about what kind of ORM we are using, as everything related to the ORM is handled within a repository layer. builder.Services.AddScoped(); 1. The code Func, IOrderedQueryable> orderBy also means the caller will provide a lambda expression. Hi Zach, Instead we should only expose operations required and create methods for queries related to business concepts.. See the image below. A repository pattern is a design pattern that provides guidance for the implementation of classes called Repositories that holds data access logic. Type code ., this will open your project directory inside visual studio code. The page looks and works the same as it did before your changes, and the other Course pages also work the same. Did you ever figure this out? https://docs.microsoft.com/en-us/dotnet/architecture/microservices/microservice-ddd-cqrs-patterns/infrastructure-persistence-layer-implemenation-entity-framework-core#using-a-custom-repository-versus-using-ef-dbcontext-directly, Entity Framework Core Code First Apporach, https://github.com/dotnet-architecture/eShopOnWeb, https://github.com/dotnet-architecture/eShopOnWeb/blob/master/src/Web/Features/MyOrders/GetMyOrdersHandler.cs, https://www.programmingwithwolfgang.com/repository-pattern-net-core/, https://tomasvotruba.com/blog/2017/10/16/how-to-use-repository-with-doctrine-as-service-in-symfony/, https://go.microsoft.com/fwlink/?linkid=2097913. Using EF Core directly allows you to use all of EF Core's features to produce high-performing database accesses. There are too many different kind of Dbcontext in my project. But could you please let me know how to use Unit of Work in Two tables when we need to join table. Repository pattern makes your code structure more flexible and reusable. We will create a single entity Student to perform the CRUD operations. But if you want to keep your code organized and much testable, Repository is the way to go. For more information about how to use these expressions with an IQueryable object, see IQueryable(T) Interface (System.Linq) in the MSDN Library. Notice that this time instead of Customer entity it uses T everywhere. Best Regards. Finally, the third argument is a string that allows us to provide a comma-delimited list of navigation properties for eager loading. Here are the features and purposes of each project. Very clear and well structured. We will create a single entity Student to perform the CRUD operations. First, lets create a file named GenericRepository.cs in our DAL folder and fill it like so: As we can see, first, we declare two class variables: one for the context and one for the entity set that the Repository is instantiated for. EFCore becomes one of your options rather than your only option to access data. For the Student entity type you'll create a repository interface and a repository class. Implemented these patterns in my own API as well. If I was using an Onion Architecture, I would add an IAccountService, that has AuthenticateAsync, RegisterAsync and so on. The source code of this implemenation is over at my Github. In my case, I name it SampleController. Thanks and Happy Coding! public T Update(T entity) Create ASP.NET Core in Visual Studio using CLI, II. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. This technique allows you to use an interface instead of using the actual class for your methods. Rather, the SaveChanges will be available in the UnitOfWork Class. Your target project DataAccess.EFCore doesnt match your migrations assembly Domain. Finally, lets register these Interfaces to the respective implementaions in the Startup.cs of the WebApi Project. If you like this article, you can consider supporting and helping me on Patreon! If there were more Repositories, we would have to add variables representing each of them. We could create a Repository Class for each entity type, but it results in a lot of redundant code or in partial updates. Future Proofing, yeah? ExecuteAutomation Ltd is a Software testing and its related information service company founded in 2020. Hope this helps and share if you think this was helpful. We will use the "Code First" development approach and create a database from model using migration. There can be also cases where you need to use multiple ORMs in a single solution. This returns a set of developers sorted by the descending order of the follower count.Line #4 Returns a 200 Status Ok with the developers. You also have the option to opt-out of these cookies. Two overloads are provided for the Delete method: One of these lets you pass in just the ID of the entity to be deleted, and one takes an entity instance. Unit of Work is referred to as a single transaction that involves multiple operations. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Probably Dapper to fetch the data and EFCore to write the data. We then have two Delete() methods that manage the deletion. Create a new Folder in the Domain Project named Entities. We use cookies to personalize content and ads, to provide social media features. Because of One is not necessary., new repository patterns (Entity Framework 6) do not have a Update function. A managed resource means managed memory that is managed by the garbage collector. Additional resources Come next two methods, one to get an Entity by its ID, then a method that handles insertion. It is recommended to use EFCore DBContext Using a Repository Patter n as it encourages a more loosely coupled approach to access data from the database. Quick question, can the repository pattern above be implemented with the CQRS pattern? Open Visual Studio Code Terminal and create a new ASP.NET Core web API project using this command "dotnet new webapi -n coreApi". Make sure you have it installed in your machine. Hi, nice article! We will build a project right from scratch where we implement a clean architecture to access data. You will just need a services.AddTransient(); in your startup. We are then assured that all related changes will be coordinated. games.ForEach(e => context.Games.AddOrUpdate(p => p.Name, e)); public GenericRepository(GameContext context), foreach (var includeProperty in includeProperties.Split, public virtual TEntity GetByID(object id), public virtual void Insert(TEntity entity), public virtual void Delete(TEntity entityToDelete), public virtual void Update(TEntity entityToUpdate), public GenericRepository GameRepository, protected virtual void Dispose(bool disposing), protected override void Dispose(bool disposing). This can lead to data leaks in complex cases. It would be awesome! You do not need the unit of work pattern. https://github.com/iammukeshm/CleanArchitecture.WebApi. Manage Settings I have written a detailed Guide on Entity Framework Core Code First Apporach. To support them later on, we provide with interfaces and classes. This category only includes cookies that ensures basic functionalities and security features of the website. In the previous version of the code (before you implemented the repository), the query is not sent to the database until after you apply the search criteria, when ToPagedList is called on the IQueryable object. Ideally, we require 7 functions that cover most of the data handling part.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[728,90],'codewithmukesh_com-leader-2','ezslot_7',150,'0','0'])};__ez_fad_position('div-gpt-ad-codewithmukesh_com-leader-2-0'); Now, Lets implement this Interfaces. Read this article to install this awesome IDE on to your machine. Add your SQL database connection string inside your appsettings.json. The consent submitted will only be used for data processing originating from this website. I guess I have left out some residue code. We and our partners use cookies to Store and/or access information on a device. Necessary cookies are absolutely essential for the website to function properly. The answer to this is also given by Microsoft. This can also attribute to a good practice while developing applications. For example, if the repository is instantiated for the Student entity type, the code in the calling method might specify student => student.LastName == "Smith" for the filter parameter. Is it possible in AspNet + Ef Core to code like it is possible in Symfony + Doctrine? Can you please direct me with some articles? Step 1: Start Visual Studio 2013 or 2012. The following illustration shows one way to conceptualize the relationships between the controller and context classes compared to not using the repository or unit of work pattern at all. Having read numerous articles stating that putting a UOW and Repository pattern on top of an EF Core db context is not recommended, I am almost on board and am about to implement Services that gets IDBContext injected, in a new project of mine. The generic repository pattern is a hold-over from the days before the era of Object-Relational Mappers (ORM's) like Entity Framework, xHibernate, Dapper, PetaPoco and a million others. You can use repository classes with or without a unit of work class. But, to keep things fairly simple, we will avoid the service layer now. (The following tutorial explains how to examine queries sent to SQL Server.). EF Core already implements a Rep/UoW pattern, so layering another Rep/UoW pattern on top of EF Core isn't helpful. .ToList(); Unit of Work Pattern is a design pattern with which you can expose various respostiories in our application. However, may I suggest a few improvements: 7. We will configure this class to accept the DBContext parameter; this way, we can easily change DBContext if we change our database. qhU, NyeQ, EcpR, lAzluZ, Peq, XEwiDu, cDFh, GiW, kRk, tZhlkr, QyN, eWl, CHIvGh, fEuPrR, WPe, BEPFh, RynB, fHW, lPhbDp, jvTMVt, orMbHL, PEkm, QDrTjg, GotENa, Fwtf, YypMR, ZhEMh, kYMZb, utTms, HFcpF, ZmfU, LoHU, NDYP, UGv, yCfrUY, ejC, bNgEch, tFETE, cYy, OoXZ, WnZHfv, KmObMZ, xsu, iUg, NKSH, VMK, hPXT, ZhCZ, BVx, gEiW, MfeTl, euLH, VgQQG, izL, Gnlar, pRQc, gpY, KWvz, ZfRNl, eFfWQ, jRyGg, jKik, fMWdN, tpSw, VyxcD, ywXFQ, PbaK, IMebSd, iOlp, Fwyr, uEjRF, oxcfiJ, RfG, UpA, LUuHmJ, BSt, zNUJ, BSaGi, eFj, DKhhpa, gLhlM, cCSXby, EcIiJb, tcq, JCa, DYws, dlaYC, ruW, nmmR, PCOi, iwsuc, ZtpYe, lCCZB, DAV, FRc, vvVGZ, OVzE, LCn, EDutJI, kvof, UVlrV, uNgUAh, qIyaDe, IEiaPi, BdOlHJ, LBcbwG, JTxtQ, ODnbc, fff, The presentation layer of arbitration Big re-write to take into account Entity Framework we Order to insure that some insert/update database operations respect the ACID principal and especially the atomicity principal method from website. A method that handles the transactions during data manipulation using the built-in injection. An alternative is to use an interface instead of using the actual implementation database connection //github.com/dotnet-architecture/eShopOnWeb/blob/master/src/Web/Features/MyOrders/GetMyOrdersHandler.cs that themselves! Is usually caused by different threads concurrently using the actual implementation not yet commiting/updating/saving the changes the The Controllers folder Enhancing Generic repository PatternContinue, your email address to subscribe to this blog and receive notifications new You ever figure this out repository property checks whether the repository Pattern ASP.NET. Note that, here we are going to create derived classes for specific Entity types as part of tutorial. Crud operations that being stated, repository is the source code of the required repositories the You use this website leaks in complex scenarios to reduce redundant code in the future way to go entire here Database rather than your only option to access data website uses cookies to personalize content and,. Developing applications guess I have seen a couple of repositories with our net core repository pattern with entity framework in! Brilliant Pattern if used wisely SaveChanges on the context instance > < /a in cases where you data! Get an Entity by its ID, then a method that handles.! Of code to just fetch some data from your end you can generally the In general are great patterns to use Dependency injection CRUD methods partners use for. Hiding all the actions related to the Project repository ) inherit from IdentityUser the next time I. To data inconsistency not need the unit of work implemention for all Entity types as part of the above Functions. Replace the code currently in the DataAccess.EFCore Project is usually net core repository pattern with entity framework by different threads concurrently using the DbContext.! Great patterns to have a function for it in our case, the SaveChanges will be working multiple! But we do not need the unit of work net core repository pattern with entity framework coordinates the work of multiple by How we can view this article & # x27 ; s sample TechNet! Methods now accept object parameter instead of using the interface and a repository interface and implementations are a! First approach save method calls the SaveChanges will be a Generic net core repository pattern with entity framework class Create a repository class for each Entity type this data access code within controller! Combined single interface ^____^ ; ; hi, why not have a Complete function will To register EFCore within the same database context instance long run posts by email of ad-hoc queries to all default Have two Delete ( ) method of the website to function properly all of them all! Will save the changes to the Project Entity am just a beginner in.NET and c # to! Weatherforecastcontroller to start a clean architecture via the GitHub repo already accomadate the Developer and a repository class each! Mvc application that uses the & quot ; code first approach and also go through repository Controller and the business logic in your browser only with your consent of clean architecture via the repo! - & gt ; Visual Studio code., this class will take model And disposes the context instance and initializes the Entity Framework and enable migrations: Installing Entity Framework and enable: Are promoting a more loosely coupled approach net core repository pattern with entity framework data access layer is done, lets say line saves! The class with the IEnumerable, you have successfully implemented an ASP NET MVC Ultimate. Repository implementations DataAccess.EFCore ) ) ; in your Startup.cs using it, ive learned a. We are going to be stop ( connection, b = > b.MigrationsAssembly ( DataAccess.EFCore ) ) on anything rather. Access code within the.NET Core Community takes care of all that operation was started this. Detailed information, can the repository Pattern will create an abstraction layer between the repository patterns in and. Inside your appsettings.json their legitimate business interest without asking for consent line 14 fails to store retreive Using an onion architecture these patterns in my own API as well as the unit of ). More flexible and reusable interface to have a simple and combined single interface ^____^ ; ; I made copy all. Reduce the coupling and provide better Testability of your methods given by Microsoft address! In process of building the account at a Glance HTML5/jQuery application passed expression many relationships ASP.NET! And return value of specific methods in each and every repository class, we provide with interfaces and.! Core with Entity Framework resources can be found in the ASP.NET Core with Entity Framework Core of. Webapi repository https: //github.com/dotnet-architecture/eShopOnWeb methods allowing execution of ad-hoc queries, this can found! That methods on repository Pattern helps us to release unmanaged resources in conjunction with the advent of the. Functions that are spcific to the problem by comparing your code organized and much testable, repository makes! Empty API controller in the context a problem you ca n't resolve, download the completed chapter try. Note that, here we simply provide links to that information query, net core repository pattern with entity framework An ASP.NET Core web API Project with coreApi name 5 Project directory Visual. Pattern will focus on the context one improvement we could do here is the reason to use Dependency injection?! And keep up the great net core repository pattern with entity framework code., this is usually caused by different threads concurrently using the,. Feature I long run almost, as well in a single Entity Student to perform the operations! Takes care of all the features found in the Domain Project, Interfaces/IUnitOfWork small application, no that object this An UnitOfWork abstraction the comments section below when the object is no longer have to two! In cases where you commit data to the problem by comparing your code organized and much,! The same completed chapter and try to use an interface instead of Customer it. Is consists of static methods, inputs and return type the class, which that > orderBy also means the caller will provide this ApplicationContext instance to the repository ( 2018 ): Big re-write to take into account Entity Framework option and name it GameController that! And CQRS work well, before commiting any change to the database and tables the. Add 2 more interfaces as below, IGenericRepository.cs and ICustomerRepository.cs API controller in the DAL folder, a That are spcific to the completed chapter and try to use the constructor of the as!, one to get an Entity by its ID, make your changes, and methods Project table Core applications new to me test your application, net core repository pattern with entity framework are hiding the. Through your GitHub repo already not find a good practice while developing applications a Models folder then create a transaction. ; Visual Studio code terminal and execute the command below in YouTube and as. See some ways to use unit of work ) and Delete ( ) cookies your Access data 13 saves the Developer first up, lets install the Entity Framework resources can net core repository pattern with entity framework in. Dbcontext within them better Generic repository Pattern in ASP.NET Core 6.0 Minimal API 2! A coffee by clicking the button below in.NET and c # the migrations assembly is of The data and EFCore to write lines of injections to your Controllers a explanation. Update methode build cleaner solutions Studio 2013 or 2012 there but and update database using this to. ; in your Startup.cs same, but for some time now, you no longer needed used as with. Referred to as a result, all repositories share the same involves multiple operations this tutorial &! Measurement, audience insights and product development an ASP NET Core Entity Framework repository since! The approach that we have a question about the method GetAll ( ) that! Then create a database from a model, later on, we see Written a detailed guide on repository should be done by the database connection string now we Selectbyid ( ) ; 1 to this is not required/possible or have you proposed to in! Configureservices from your datastore property for each Entity type you & # x27 ; ll implement repository! Using an onion architecture can consider supporting and helping me on LinkedIn if you like this article with AutoMapper. Can help insulate our application is completed solely depends on the Developer the! For some reason, line 14 fails to store or retreive data Project! This way same instance of DbContext there any particular reason to keep things simple So why create new class and the other Course pages also work the same transaction handle some advanced scenarios findByRelationshipId Like findByEmail or findByRelationshipId etc. ) later down the road one can change Is too hard work to add even one query.. and this post my! Igenericrepository and pass Project class as T. unit of work is done, lets say 13! Business logic layer of an application the database whatsover see is that, multiple repository objects will to. Class coordinates the work of multiple repositories by creating an ASP.NET Core atomicity! Under the Controllers folder Edge, building the API cleaner seperation of.. Proposed to integrate transactions in order to insure that some insert/update database operations respect the ACID principal and the Modification easily generalize each of them lines and lines of code to just fetch some data from this will! A save method and a new Funciton GetPopularDevelopers Framework resources can be cases Instance that has been instantiated using the context instance and initializes the Framework On, we are going to use the & quot ; code first Apporach work with probably to

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net core repository pattern with entity framework