Question

我正在尝试将简单的子查询转换为LINQ（c＃）：

select * from tblFundtoFiscalYear ftfy
where ftfy.FiscalYear = 2015 
    and ftfy.FundID =(
        SELECT FundID
        FROM tblAccountDirectParent]
        where ParentAccountID = 19 )

有些事情：

var queryFTFY =
    from ftfy in FRATContext.tblFundtoFiscalYear
    where ftfy.FiscalYear == 2015 
        && ftfy.FundID =
            (from adp in FRATContext.tblAccountDirectParent
             where adp.ParentAccountID == 19
             select adp.FundID)
    select new
    {
        ftfy.FundtoFiscalYearID
    };

将不胜感激。

Answer 1

您的SQL依赖于子查询只返回一个结果的假设。您可以在LINQ中明确指出：

var queryFTFY =
    from ftfy in FRATContext.tblFundtoFiscalYear
    where ftfy.FiscalYear == 2015 && ftfy.FundID ==
    (
        from adp in FRATContext.tblAccountDirectParent
        where adp.ParentAccountID == 19
        select adp.FundID
    ).Single()
    select ftfy;

或者，您可以将查询（在两种情况下）重新表示为连接：

var queryFTFY =
    from ftfy in FRATContext.tblFundtoFiscalYear
    join adp in FRATContext.tblAccountDirectParent
    on ftfy.FundID equals adp.FundID
    where ftfy.FiscalYear == 2015 
       && adp.ParentAccountID == 19
    select ftfy;

将sql子查询转换为linq

1 个答案: