轉換SQL查詢的LINQ C＃

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H1可以任何一個幫助如何在LINQ的C＃轉換SQL查詢的LINQ C＃

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

這裏寫這篇文章下面的查詢是我已經試過：

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 };

來源

2017-06-22 Srinivasa S

你到目前爲止嘗試過什麼？ SO不是代碼寫入服務。 – Rob

我試過這樣，但沒有得到想要的輸出。 VAR maxYear =從今年dbContext.Years 在year.YearId dbContext.CurrencyExchangeRates加入交換等於exchange.YearId 其中exchange.BudgetCodeId == budgetCodeId排序依據year.YearValue降選擇新 { yearValue = year.YearValue } ; –

這看起來不像你之後的SQL。什麼是「CurrencyExchangeRates」？你爲什麼按年份價格訂購？ – Rob

這就是你」尋找：

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();

來源

2017-06-22 11:00:04

轉換SQL查詢的LINQ C＃

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