转换SQL查询的LINQ C＃

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H1可以任何一个帮助如何在LINQ的C＃转换SQL查询的LINQ C＃

select YearValue from [Information].Year 
where YearId in (select max(YearId) from curreny where BudgetCodeId = 2)

这里写这篇文章下面的查询是我已经试过：

var maxYear = 
    from year in dbContext.Years 
    join exchange in dbContext.CurrencyExchangeRates 
    on year.YearId equals exchange.YearId 
    where exchange.BudgetCodeId == budgetCodeId 
    orderby year.YearValue descending 
    select new { yearValue = year.YearValue };

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2017-06-22 Srinivasa S

你到目前为止尝试过什么？ SO不是代码写入服务。 – Rob

我试过这样，但没有得到想要的输出。 VAR maxYear =从今年dbContext.Years 在year.YearId dbContext.CurrencyExchangeRates加入交换等于exchange.YearId 其中exchange.BudgetCodeId == budgetCodeId排序依据year.YearValue降选择新 { yearValue = year.YearValue } ; –

这看起来不像你之后的SQL。什么是“CurrencyExchangeRates”？你为什么按年份价格订购？ – Rob

这就是你”寻找：

var maxYear = from year in dbContext.Years where (from exchange in dbContext.CurrencyExchangeRates where exchange.BudgetCodeId == 2 select exchange) 
    .Max(m => m.YearId) == 
     year.YearId select year.YearValue; 

int mYear = maxYear.First();

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2017-06-22 11:00:04

转换SQL查询的LINQ C＃

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