MongoDB学习笔记~以匿名对象做为查询参数，方便查询子对象

  public IEnumerable<TEntity> GetModel<U>(U template)
        {
            return _table.Find(GeneratorMongoQuery(template)).ToListAsync().Result;
        }

        public PagedResult<TEntity> GetModel<U>(int pageIndex, int pageSize)
        {
            return this.GetModel(new { }, pageIndex, pageSize);

        }

        public PagedResult<TEntity> GetModel<U>(U template, int pageIndex, int pageSize)
        {
            return this.GetModel(template, new { }, pageIndex, pageSize);
        }

        public PagedResult<TEntity> GetModel<U, O>(U template, O orderby, int pageIndex, int pageSize)
        {
            #region 条件过滤
            BsonDocumentFilterDefinition<TEntity> filterDefinition = GeneratorMongoQuery(template);
            #endregion

            #region 排序处理
            SortDefinition<TEntity> sorts = new ObjectSortDefinition<TEntity>(new { });
            foreach (var item in typeof(O).GetProperties())
            {
                if ((OrderType)item.GetValue(orderby) == OrderType.Asc)
                    sorts = sorts.Ascending(item.Name);
                else
                    sorts = sorts.Descending(item.Name);
            }
            #endregion

            #region 分页处理
            var skip = (pageIndex - 1) * pageSize;

            var recordCount = _table.Find(filterDefinition).CountAsync(new CancellationToken()).Result;
            var limit = pageSize;
            return new PagedResult<TEntity>(
                recordCount,
                (int)(recordCount + pageSize - 1) / pageSize,
                pageSize,
                pageIndex,
                _table.Find(filterDefinition)
                      .Sort(sorts)
                      .Skip(skip)
                      .Limit(limit)
                      .ToListAsync().Result);
            #endregion


        }

   /// <summary>
        /// 构建Mongo的查询表达式，通过一个匿名对象
        /// </summary>
        /// <typeparam name="U"></typeparam>
        /// <param name="template"></param>
        /// <returns></returns>
        private BsonDocumentFilterDefinition<TEntity> GeneratorMongoQuery<U>(U template)
        {
            var qType = typeof(U);
            var outter = new BsonDocument();
            var simpleQuery = new BsonDocument();
            foreach (var item in qType.GetProperties())
            {
                if (item.PropertyType.IsClass && item.PropertyType != typeof(string))
                {
                    //复杂类型，导航属性，类对象和集合对象 
                    foreach (var sub in item.PropertyType.GetProperties())
                    {
                        simpleQuery.Add(new BsonElement(item.Name + "." + sub.Name,
                           BsonValue.Create(sub.GetValue(item.GetValue(template)))
                            ));
                    }
                }
                else
                {
                    //简单类型,ValueType和string
                    simpleQuery.Add(new BsonElement(item.Name,
                      BsonValue.Create(item.GetValue(template))
                        ));
                }
            }
            return new BsonDocumentFilterDefinition<TEntity>(simpleQuery);
        }