Asp.Net_EF5.0区别于EF4.0的crud区别

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public T AddEntity(T entity)   {       //EF4.0的写法   添加实体      //db.CreateObjectSet<T>().AddObject(entity);      //EF5.0的写法       db.Entry<T>(entity).State = EntityState.Added;         //下面的写法统一       db.SaveChanges();       return entity;   }     //实现对数据库的修改功能     public bool UpdateEntity(T entity)   {       //EF4.0的写法       //db.CreateObjectSet<T>().Addach(entity);      //db.ObjectStateManager.ChangeObjectState(entity, EntityState.Modified);       //EF5.0的写法       db.Set<T>().Attach(entity);     db.Entry<T>(entity).State = EntityState.Modified;      return db.SaveChanges() > 0; }         //实现对数据库的删除功能   public bool DeleteEntity(T entity)   {       //EF4.0的写法       //db.CreateObjectSet<T>().Addach(entity);       //db.ObjectStateManager.ChangeObjectState(entity, EntityState.Deleted);       //EF5.0的写法      db.Set<T>().Attach(entity);       db.Entry<T>(entity).State = EntityState.Deleted;       return db.SaveChanges() > 0;  }        //实现对数据库的查询  --简单查询   public IQueryable<T> LoadEntities(Func<T, bool> whereLambda)   {       //EF4.0的写法       //return db.CreateObjectSet<T>().Where<T>(whereLambda).AsQueryable();       //EF5.0的写法       return db.Set<T>().Where<T>(whereLambda).AsQueryable();  }