SQL ROW_NUMBER（）在LINQ查詢語法

Question

我有這個疑問至極我想使用LINQ更換爲查詢語法：

select 
    ii.Id, ii.Name as Supplier, 
    qi.Price1, qi.Price2, qi.Price3, 
    case when qi.price1 is null then NULL else ROW_NUMBER() OVER(ORDER BY isNull(qi.price1,1000000) ASC) end AS Price1Order,  
    case when qi.price2 is null then NULL else ROW_NUMBER() OVER(ORDER BY isNull(qi.price2,1000000) ASC) end AS Price2Order,  
    case when qi.price3 is null then NULL else ROW_NUMBER() OVER(ORDER BY isNull(qi.price3,1000000) ASC) end AS Price3Order 
From dbo.InquiryItems ii 
left join dbo.quoteItems qi on ii.Id = qi.QuoteItem_InquiryItem 

SQL查詢結果：

Id  Supplier  Price1 Price2 Price3 Price1Order Price2Order Price3Order 
1655 Supplier 2  80.00 NULL 40.00 3   NULL  1 
1656 Supplier 4  65.00 30.00 42.00 2   1   2 
1662 Supplier 1  15.00 35.00 43.00 1   2   3 
1670 Supplier 3  250.00 NULL NULL 4   NULL  NULL 

在C＃中，我需要這個查詢是一個IQueryable對象。我必須過濾不同部分（一個或多個）的查詢，然後按供應商（IdAccount）對其進行分組，然後合計價格。這個價格我必須排名。

return colQuoteItem = from vQuote in this.vQuoteItemOverviews 
    where vQuote.IdConstructionStageId == ConstructionStageId        
    group vQuote by new 
    { 
     vQuote.IdAccount 
    } into g                
    select new vQuoteItemOverviewSum 
    { 
     Id = g.Max(x => x.Id),         
     Price1Order = null, //Here i need the ROW_NUMBER like in the SQL-Syntax 
     Price2Order = null, //Here i need the ROW_NUMBER like in the SQL-Syntax 
     Price3Order = null, //Here i need the ROW_NUMBER like in the SQL-Syntax 
     price1 = g.Sum(x => x.price1), 
     price2 = g.Sum(x => x.price2), 
     price3 = g.Sum(x => x.price3),         
    } 
    ; 

謝謝。

Answer 1

這工作？

var qi1 = (from qi in quoteItems orderby qi.price1 select new {qi.QuoteItem_InquiryItem}).AsEnumerable().Select((i, index) => new {i.QuoteItem_InquiryItem, Rank = index + 1}); 

var qi2 = (from qi in quoteItems orderby qi.price2 select new {qi.QuoteItem_InquiryItem}).AsEnumerable().Select((i, index) => new {i.QuoteItem_InquiryItem, Rank = index + 1}); 

var qi3 = (from qi in quoteItems orderby qi.price3 select new {qi.QuoteItem_InquiryItem}).AsEnumerable().Select((i, index) => new {i.QuoteItem_InquiryItem, Rank = index + 1}); 


return colQuoteItem = from vQuote in this.vQuoteItemOverviews.AsEnumerable() 
    where vQuote.IdConstructionStageId == ConstructionStageId        
    group vQuote by new 
    { 
     vQuote.IdAccount 
    } into g                
    select new vQuoteItemOverviewSum 
    { 
     Id = g.Max(x => x.Id),         
     Price1Order = qi1.FirstOrDefault(_ => _.IdConstructionStageId == x.Id)?.Rank, //Here i need the ROW_NUMBER like in the SQL-Syntax 
     Price2Order = qi2.FirstOrDefault(_ => _.IdConstructionStageId == x.Id)?.Rank, //Here i need the ROW_NUMBER like in the SQL-Syntax 
     Price3Order = qi3.FirstOrDefault(_ => _.IdConstructionStageId == x.Id)?.Rank, //Here i need the ROW_NUMBER like in the SQL-Syntax 
     price1 = g.Sum(x => x.price1), 
     price2 = g.Sum(x => x.price2), 
     price3 = g.Sum(x => x.price3),         
    } 
    ;