Skip to main content

Implementing repository pattern with the entity model

There are lots of ways to implement repository pattern but with entity model you can create repository pattern within 10 to 15 minutes.

If you are creating mvc application then just right click->Model folder->Add->Net Item->select entity data model.

From database explorer right click and drag your tables to your database explorer. It will create a entity class. For example i have created a notes table for my sample and it will create a notes entity class in my entity data model.

After creating the entity class not its time to create a interface for repository pattern which will contain my all the operations related to notes entity.

Following is the interface which we will implement use for repository.

namespace DotNetJapsMVC.Models.Respository.Interface
interface INotesRepository
void CreateNotes(Notes notesToCreate);
void EditNotes(Notes notesToEdit);
void DeleteNotes(Notes notesToDelete);
Notes GetNotes(Guid noteId);
IEnumerable ListNotes();

Now we will create a class that will implement this repository interface. Here is the coding for that.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace DotNetJapsMVC.Models.Respository.Class
public class NotesRepository:Interface.INotesRepository
private DotNetJapsEntities _myEntities = new DotNetJapsEntities();

public void CreateNotes(Notes notesToCreate)

public void EditNotes(Notes notesToEdit)
var originalNotes = (from n in _myEntities.Notes
where n.NoteId == notesToEdit.NoteId
select n).FirstOrDefault();

_myEntities.ApplyPropertyChanges(originalNotes.EntityKey.EntitySetName, notesToEdit);


public void DeleteNotes(Notes notesToDelete)
var originalNotes = GetNotes(notesToDelete.NoteId);
_myEntities.DeleteObject(originalNotes );

public Notes GetNotes(Guid noteId)
return (from n in _myEntities.Notes
where n.NoteId == noteId
select n ).FirstOrDefault();

public IEnumerable ListNotes()
return _myEntities.Notes.ToList();


That's it we have created the repository classes and repository interface. You can use as following in your class or pages.

private  INotesRepository _repository;

public List LoadNotes()
 return _repository.ListNotes();

Advantage Of Repository Pattern:
  1. Make application loosely coupled so if you want to change the something then you don't need to change everything from scratch.
  2. With the repository pattern we can have nice abstraction which will separate our business logic as well as database logic.
  3. You can prevent dependency injection through the repository pattern.
Happy Programming


Popular posts from this blog

How to create Rest API(Web API) with ASP.NET Core 1.0

Recently Microsoft has released ASP.NET Core 1.0 RC2, I am getting lots of request from readers that about creating Web API. So I thought it will be a good idea to write a blog post about how to create Rest API(Web API) with ASP.NET Core 1.0.

So let’s get started via creating an ASP.NET Core 1.0 Web Application like following.

Once you click on ASP.NET Web Application, It will ask whether you need to create Web Application or Web API application. We are going to Web API so I am going to select Web API Application like following. Please note that in ASP.NET Core 1.0 there is no separate libraries or DLLs required for creating web APIs. This is just a project template.

Now once you click on OK It will create a Web API application with default values controller and program.cs.  As you know Program.cs is now starting point for the ASP.NET Core 1.0 application so It contains all the required configuration and startup items. Following is a code for that.
using System.IO; using Microsoft.Asp…

How to use migration with Entity Framework Core

Entity framework core is  the lightweight, extensible and cross-platform version of Entity Framework. Before some time, Microsoft has Released a new version of Entity Framework RC2. I have written a couple of blog post about Entity framework code first migration earlier for Entity framework 6.0. So there was a couple of request coming for writing a blog post about Entity Framework Core RC2 migration. So I thought it will be a good idea to give an overview how database migration works in Entity Framework Core RC2. This post will cover a basic scenario where we are going to create the database with existing ASP.NET Identity migration and then we are going to create a new model and have that migration applied in the database.

How to use Entity Framework Migrations: Let’s get started, To demonstrate entity framework core migrations, I am going to create a sample core web application like following.

Once we select core application it will appear the following dialog.

Now w…

Creating PDF with ASP.Net MVC and RazorPDF

Update: I have written a new blog post about better approach to create a PDF with mvc- You can find that following location.- A Better Solution to create PDF with Rotativa and ASP.NET MVC
In this post we are going to learn how we can easily create PDF from ASP.Net application with the help of Razor PDF NuGet package.

About Razor PDF:
This NuGet package is created by Al Nyveldt It internally uses ITextSharp an open source PDF convertor library. RazorPDF uses Razor View engine to create iTextXML which is in tern used to produce PDF file. You can get more information about that at below link.

Example(Creating PDF with ASP.Net MVC):
So what we are we waiting for ? Let’s create a simple example. To create example first thing we need to a create and ASP.Net MVC application.