我正在尝试模仿:
DB1 AS A LEFT OUTER JOIN
DB2 AS B
ON A.[Currency Code] = B.[Currency Code]
AND A.[Document Date] >= B.[Starting Date]
AND A.[Document Date] <= B.[Ending Date]
这是我现在拥有的内容:
from ledgers in ledgerEntries
join currency in currencyExchange
on ledgers.CurrencyCode equals currency.CurrencyCode
into c
from currencies in c.DefaultIfEmpty()
where
ledgers.DocumentDate >= currencies.StartingDate
&& ledgers.DocumentDate <= currencies.EndingDate
我了解创建匿名类型并将它们相互赋值的方法,但是在使用小于和大于符号比较日期时,这种方法不起作用。