Repository pattern with EF Code First

问题

I am not grasping something when creating my repository pattern with EF Code First. If I want to abstract out EF I would have to make my repository be of type IObjectContextAdapter, no? That is what DbContext implements. If I later switch to use something like NHibernate or some other 3rd party ORM, it may not implement IObjectContextAdapter.

Is my only solution to create a wrapper that wraps the ORM and does return an implementation of IObjectContextAdapter? If so, what is the point?

回答1:

I'm not sure you have to implement IObjectContextAdapter when creating a repository pattern with EF. The main difference between using EF or something like NHibernate will be how to wrap either the DbContext or the ISession respectively.

Here is a sketch of how an EF code-first repository could be written:

public interface IRepository<TEntity>
{
    void Save();
}


public class Repository<TEntity> : IRepository<TEntity>
{
    private readonly IDbSet<TEntity> entitySet;

    public Repository(DbContext context)
    {
        this.entitySet = context.Set<TEntity>();
    }

    public void Save()
    {
        return this.entitySet.SaveChanges();
    }
}

This allows the actual DbContext to be injected.

来源：https://stackoverflow.com/questions/16135676/repository-pattern-with-ef-code-first