C# 列表<；模型>；允许DBNull

我有以下代码：

public static List<ResponseSupplier> Feza_ReturnSuppliers(string country, string locale, string rtype, string scat, string sscat, string bill, int? comp, double? inc, int? loi, bool? fc, int? hf)
    {
        string query = string.Format(Queries[SqlQueries.returnquery], country, locale, rtype, scat, sscat, bill, comp, inc, loi, fc, hf);
        IList<ExpandoObject> suppliersRaw = DatabaseHelper.MultiResponseComplex(conn, query,
            new List<string>
            {   "SupID",
                "SupName",
                "Tlabel",
                "Tcode",
                "dcstatic",
                "dcur",
                "dse",
                "ltz",
                "st",
                "isamp",
                "minf",
                "sf",
                "cpt",
                "Scoring",
                "TrustCoefficient",
                "ApiIntegrated",
                "fapi"
            });

        return suppliersRaw.Select(e => new ResponseSupplier

        {
            SupID = (((dynamic)e).SupID.ToString()) as string,
            SupName = (((dynamic)e).SupName) as string,
            Tlabel = (((dynamic)e).TierLabel) as string,
            Tcode = (int?)(((dynamic)e).Tcode),
            dcstatic = (double?)(((dynamic)e).dcstatic),
            dcur = (((dynamic)e).dcur) as string,
            dse = (((dynamic)e).dse) as string,
            ltz = (((dynamic)e).ltz) as string,
            st = (((dynamic)e).st) as string,
            isamp = (bool?)(((dynamic)e).isamp),
            minf = (double?)(((dynamic)e).minf),
            sf = (double?)(((dynamic)e).sf),
            cpt = (string)(((dynamic)e).cpt),
            Scoring = (double?)(((dynamic)e).Scoring),
            TrustCoefficient = (double?)(((dynamic)e).TrustCoefficient),
            ApiIntegrated = (bool?)(((dynamic)e).ApiIntegrated),
            fapi = (bool?)(((dynamic)e).fapi)

    }).ToList();

要允许DBNull并在结果中显示Scoring=Null？

请尝试以下操作：

Scoring = ((dynamic)e).Scoring is DBNull ? null : (double)(((dynamic)e).Scoring),
TrustCoefficient = (dynamic)e).TrustCoefficient is DBNull ? null : (double)(((dynamic)e).TrustCoefficient),

---

你需要检查每个列值是否是DBNull

可能的副本，也可以考虑使用一个类似于ORM的PATAPOCO或DAPER来自动执行这个操作。看起来真正的问题是<代码> MuleRealthCopyFix< /C> >它做什么？为什么不使用匿名类型或像Dapper这样的microORM，这样就不需要所有这些强制转换和转换了？

Scoring = ((dynamic)e).Scoring is DBNull ? null : (double)(((dynamic)e).Scoring),
TrustCoefficient = (dynamic)e).TrustCoefficient is DBNull ? null : (double)(((dynamic)e).TrustCoefficient),