如何让linq pad运行我的左连接,如下所示?如何在linq pad中执行左连接 -
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();
该LINQ垫在Management Studio但LINQ垫创建运行完全不显示任何行,并给出该错误
InvalidOperationException设置该SQL:空值不能被分配给一个 构件类型System.Int32是一个不可为空的值类型。
我怎样才能让linqpad工作,让我可以玩呢?
http://meta.stackexchange.com/a/128558/102937 –