private LoadOperation<V_Store> LoadSampleEntities()
        {
            this.CanLoad = false;
            //return this.ds.Load(this.ds.GetV_StoreQuery().SortAndPageBy(this._view));

            EntityQuery<V_Store> query = this.ds.GetV_StoreQuery();
            if (!string.IsNullOrWhiteSpace(this.Tt_Company))
                query = query.Where(e => e.co_Company.Contains(this.Tt_Company));
            if (!string.IsNullOrWhiteSpace(this.Tt_Name))
                query = query.Where(e => e.co_Name.Contains(this.Tt_Name));
            if (!string.IsNullOrWhiteSpace(this.Tt_MPa))
                query = query.Where(e => e.co_MPa.Contains(this.Tt_MPa));
            if (!string.IsNullOrWhiteSpace(this.Tt_Spec))
                query = query.Where(e => e.co_Spec.Contains(this.Tt_Spec));
            if (!string.IsNullOrWhiteSpace(this.Tt_Mill))
                query = query.Where(e => e.co_Mill.Contains(this.Tt_Mill));
            if (!string.IsNullOrWhiteSpace(this.Tt_Remark))
                query = query.Where(e => e.co_Remark.Contains(this.Tt_Remark));

            if (!string.IsNullOrWhiteSpace(Tt_StartAmount))
            {//数量
                Decimal? SAmount = Decimal.Parse(Tt_StartAmount);
                query = query.Where(e => e.co_Amount >= SAmount);
            }
            if (!string.IsNullOrWhiteSpace(Tt_EndAmount))
            {
                Decimal? EAmount = Decimal.Parse(Tt_EndAmount);
                query = query.Where(e => e.co_Amount <= EAmount);
            }

            if (!string.IsNullOrWhiteSpace(Tt_StartWeight))
            {//重量
                Decimal? SWeight = Decimal.Parse(Tt_StartWeight);
                query = query.Where(e => e.co_Weight >= SWeight);
            }
            if (!string.IsNullOrWhiteSpace(Tt_EndWeight))
            {
                Decimal? EWeight = Decimal.Parse(Tt_EndWeight);
                query = query.Where(e => e.co_Weight <= EWeight);
            }

            if (!string.IsNullOrWhiteSpace(Dt_StartTime))
            {//时间
                DateTime? STime = DateTime.Parse(Dt_StartTime);
                query = query.Where(e => e.co_UpDateTime >= STime);
            }
            if (!string.IsNullOrWhiteSpace(Dt_EndTime))
            {
                DateTime? ETime = DateTime.Parse(Dt_EndTime);
                query = query.Where(e => e.co_UpDateTime <= ETime);
            }
            if (Ci_IsZero) query = query.Where(e => e.co_Amount != 0 && e.co_Weight != 0);

            InvokeOperation<int> invokeOperation = ds.GetV_StoreWeightSum(query.SortAndPageBy(this._view)); 我想在这里再用上面的条件
            return this.ds.Load(query.SortAndPageBy(this._view));
        }