无法隐式转换类型'System.Guid？'到'DataContracts.Market'

Question

我收到以下错误

无法隐式转换类型'System.Guid？'到'DataContracts.Market'

---

    private CellSite MapEntityToCellSitePOCO(t_CellSite _cellsite)
    {

        CellSite cellsite= new CellSite();
        cellsite.SiteId = _cellsite.SiteID;
        cellsite.Market.MarketID = _cellsite.MarketId;
        cellsite.Region.RegionId = _cellsite.RegionId;


       return cellsite;
    }

以下是我的datacontracts文件

---

    public class CellSite
{


    public Guid CellSiteID { get; set; }

    public string SiteId { get; set; }
    public Region Region { get; set; }
    public Market Market { get; set; }
    public Guid? ConstructionManager { get; set;}
   }

这是market.cs

      public class Market
{
    public Guid? MarketID { get; set; }
    public string OperatorMarketName { get; set; }
    public string MarketName { get; set; }
    public decimal AllOtherAmount { get; set; }
    public decimal RawLandAmount { get; set; }
    public decimal RenewalFee { get; set; }
    public bool IsActive { get; set; }
}

在cellsite表中有一个我想引入的MarketId列。我可以这样做吗？我是实体框架工作的新手。 提前谢谢

Answer 1

您必须先初始化Market和Region媒体资源：

CellSite cellsite= new CellSite();
cellsite.SiteId = _cellsite.SiteID;

cellsite.Market = new Market();
cellsite.Market.MarketID = _cellsite.MarketId;

cellsite.Region = new Region();
cellsite.Region.RegionId = _cellsite.RegionId;