c# - 存储库模式应该使用 ObjectSet 还是 IDbSet 作为基类？

Question

我正在尝试基于 MyFinance 创建一个基础存储库类首先使用实体​​框架代码的示例。我想将其更改为仅使用 Entity Framework 。该示例使用 IDbSet ，但我不知道要将其更改为普通 Entity Framework 。也许ObjectSet<T> ？当我使用 ObjectSet<T>我丢失了一些方法，例如 GetById所以也许这不是 100% 正确的。任何帮助将不胜感激。

首先使用实体​​框架代码的示例存储库

public abstract class RepositoryBase<T> where T : class
{
private MyFinanceContext dataContext;
private readonly IDbSet<T> dbset;
protected RepositoryBase(IDatabaseFactory databaseFactory)
{
    DatabaseFactory = databaseFactory;
    dbset = DataContext.Set<T>();
}

protected IDatabaseFactory DatabaseFactory
{
    get; private set;
}

protected MyFinanceContext DataContext
{
    get { return dataContext ?? (dataContext = DatabaseFactory.Get()); }
}
public virtual void Add(T entity)
{
    dbset.Add(entity);           
}
public virtual void Update(T entity)
{
    dbset.Attach(entity);
    dataContext.Entry(entity).State = EntityState.Modified;
}
public virtual void Delete(T entity)
{
    dbset.Remove(entity);           
}
public virtual void Delete(Expression<Func<T, bool>> where)
{
    IEnumerable<T> objects = dbset.Where<T>(where).AsEnumerable();
    foreach (T obj in objects)
        dbset.Remove(obj);
} 
public virtual T GetById(long id)
{
    return dbset.Find(id);
}
public virtual T GetById(string id)
{
    return dbset.Find(id);
}
public virtual IEnumerable<T> GetAll()
{
    return dbset.ToList();
}
public virtual IEnumerable<T> GetMany(Expression<Func<T, bool>> where)
{
    return dbset.Where(where).ToList();
}
public T Get(Expression<Func<T, bool>> where)
{
    return dbset.Where(where).FirstOrDefault<T>();
} 

我认为我应该为 EntityFramework 将其更改为

public abstract class BaseRepository<T> where T : class
{
    private MyDBContainer _dataContext;
    private readonly ObjectSet<T> dbset;

    protected BaseRepository(IDatabaseFactory databaseFactory)
    {
        DatabaseFactory = databaseFactory;
        dbset = DataContext.CreateObjectSet<T>();
    }

    protected IDatabaseFactory DatabaseFactory
    {
        get;
        private set;
    }

    protected MyDBContainer DataContext
    {
        get { return _dataContext ?? (_dataContext = DatabaseFactory.DataContext); }
    }
    public virtual void Add(T entity)
    {
        dbset.AddObject(entity);
    }
    //public virtual void Update(T entity)
    //{
    //    dbset.Attach(entity);
    //    _dataContext.Entry(entity).State = EntityState.Modified;
    //}
    public virtual void Delete(T entity)
    {
        dbset.DeleteObject(entity);
    }
    public virtual void Delete(Expression<Func<T, bool>> where)
    {
        IEnumerable<T> objects = dbset.Where<T>(where).AsEnumerable();
        foreach (T obj in objects)
            dbset.DeleteObject(obj);
    }
    //public virtual T GetById(long id)
    //{
    //    return dbset.(id);
    //}
    //public virtual T GetById(string id)
    //{
    //    return dbset.Find(id);
    //}
    public virtual IEnumerable<T> GetAll()
    {
        return dbset.ToList();
    }
    public virtual IEnumerable<T> GetMany(Expression<Func<T, bool>> where)
    {
        return dbset.Where(where).ToList();
    }
    public T Get(Expression<Func<T, bool>> where)
    {
        return dbset.Where(where).FirstOrDefault<T>();
    }

}

Answer 1

ObjectSet<T>是 DbSet<T> 的前身及其关联界面 IDbSet<T> .但是没有，因为我确定您已经发现了 IObjectSet<T> , 但你应该使用 ObjectSet<T> 是正确的代替 DbSet<T> .