EF 初级仓储模型调用问题 “内部连接致命错误。”“连接未关闭。连接的当前状态为正在连接。”

悬赏园豆：30 [已解决问题] 解决于 2012-10-30 18:07

    public class Repository<T> where T : class
    {
        public readonly DBContext _context;
        public readonly DbSet<T> _dbSet;

        public Repository()
        {
            //if (_context == null)
            //{
            this._context = new DBContext();
            //}
            this._dbSet = this._context.Set<T>();
        }

        public T GetModel(Expression<Func<T, bool>> where)
        {
            //using (var __context = new UBIQ_CemeteryDBContext())
            //{
            //    return __context.Set<T>().FirstOrDefault(where);
            return _dbSet.FirstOrDefault(where);
            //}
        }

以上代码写在 Repository 类中，BaseService 中如下定义：

        private static Repository<NewInfo> ___Dal_NewInfo;
        /// <summary>
        /// NewInfo
        /// </summary>
        protected static Repository<NewInfo> __Dal_NewInfo
        {
            get
            {
                if (___Dal_NewInfo == null)
                {
                    ___Dal_NewInfo = new Repository<NewInfo>();
                }
                return ___Dal_NewInfo;
            }
        }

        private static Repository<NewInfo> ___Dal_NewInfo;
        /// <summary>
        /// NewInfo
        /// </summary>
        protected static Repository<NewInfo> __Dal_NewInfo
        {
            get
            {
                if (___Dal_NewInfo == null)
                {
                    ___Dal_NewInfo = new Repository<NewInfo>();
                }
                return ___Dal_NewInfo;
            }
        }

业务层返回新闻详细页 ViewModel,代码如下：

        public News_Details_Model GetModel_News_Details_Model(int id)
        {
            News_Details_Model vModel = new News_Details_Model();
            if (id != 0)
            {
                string WebSiteStr = "文章中心";
                NewInfo model = __Dal_NewInfo.GetModelByCache(n => n.NewID == id);
                vModel.NewInfor = model;
                //更新点击数
                if (model != null)
                {
                    #region 查找上一篇和下一篇文章 & 新闻标题
                    int PresentID = model.NewID;
                    int CateID = model.CateID;// 类别ID
                    if (PresentID > 0 && CateID > 0)
                    {
                        vModel.PrevModel = __Dal_NewInfo.GetModel(a => a.NewID < PresentID && a.CateID == CateID && a.IsOK == 1, x => x.OrderByDescending(n => n.NewID));
                        vModel.NextModel = __Dal_NewInfo.GetModel(a => a.NewID > PresentID && a.CateID == CateID && a.IsOK == 1, x => x.OrderBy(n => n.NewID));
                        var category = __Dal_NewCategory.GetModel(nc => nc.CateID == CateID);
                        if (category != null)
                        {
                            WebSiteStr = category.CateName;
                        }
                    }
                    #endregion

                    #region 更新点击量
                    //更新点击量
                    model.NewClick += 1;
                    __Dal_NewInfo.Update(model, true);
                    #endregion

                }
                vModel.WebSiteStr = WebSiteStr;
            }
            return vModel;
        }