Adding Object in Entity Framework

Question

In an Application it has Data Access layer.In which it has DataEntityModel.edmx (entityframework model) and repository class.

Below code is my repository class.

namespace DataModel.Repository
{
 public class ProductRepository
 {
    internal WebApiDbEntities Context;
    internal DbSet<Product> DbSet;

     public ProductRepository(WebApiDbEntities context)
    {
        this.Context = context;
        this.DbSet = context.Set<Product>();
    }

    public virtual void Insert(Product entity)
    {
        DbSet.Add(entity);
    }

}

}

Question is I have used DbSet.Add(entity) method to insert . But Entity Framework will generate it's own Add method Context.Products.Add(entity)

So, What is the difference between those two methods. Why Most of the time DbSet.Add(entity) is used ??

Answer 1

A repository replaces the use of the DbContext.

So to add an entity, instead of:

var dbContext = new WebApiDataModel();
dbContext.Products.Add(entity)

You use a repository:

var dbContext = new WebApiDataModel();
var productRepository = new ProductRepository(dbContext);
productRepository.Insert(entity);

In the end, both call DbSet<Product>.Add() , but there are reasons why you may want to introduce the repository pattern with Entity Framework.