如何让 linq pad 运行我的左连接,如下所示?
var query =
from s in db.CDBLogsHeaders
.OrderByDescending(g => g.LogDateTime)
from sc in db.StyleColors
.Where(stylecolor => stylecolor.id == (int?)s.StyleColorID)
.DefaultIfEmpty()
from c in db.StyleHeaders
.Where(styleHeader => styleHeader.id == (int?)s.StyleHeaderID)
.DefaultIfEmpty()
select new
{
CDBLogsHeaderId = s.Id,
Merchandiser = c.Merchandiser,
Material = s.Material,
Season = s.Season,
LogsHeaderLogType = s.LogType,
PushFromTo = s.PushFromTo,
LinePlan = s.LinePlan,
QuikRefNumber = s.QuikRefNumber,
PLMOrigin = s.PLM_Origin,
SeasonOriginal = c.SeasonOriginal,
SeasonCurrent = c.SeasonCurrent,
StyleHeaderId = c.Id,
StyleCode = c.StyleCode,
StyleColorsColorCode = sc.ColorCode
};
query.Dump();
linq pad 创建的 sql 在 Management Studio 中完美运行,但 linq-pad 不显示任何行并给出此错误
InvalidOperationException:无法将 null 值分配给 System.Int32 类型的成员,该类型是不可为 null 的值类型。
我怎样才能让 linqpad 工作,这样我就可以玩它了?