linq to entities不在聲明中

Question

我是新來的linq實體。我試圖做一個不在聲明中，當我運行它，我正在注意回來。但是，如果我運行相當於SQL的數據，我會返回數據。

我試圖複製的SQL語句是

SELECT * FROM [SCRAPREASON] WHERE [CODE] NOT IN (SELECT [CODE] FROM [QUALITYALERTRULE]) ORDER BY [CODE] 

LINQ的我目前所面對的是

var DefectCode = PumaOEEEntities.ScrapReasons 
    .Where(x => !PumaOEEEntities.QualityAlertRules.Any(y => y.Code != x.Code)) 
    .Select(x => new { GroupID = x.Code}).ToList(); 

有人能看到我在做什麼錯？

Answer 1

您應該比較平等碼（==而不是!=）：

var reasons = PumaOEEEntities.ScrapReasons 
    .Where(x => !PumaOEEEntities.QualityAlertRules.Any(y => y.Code == x.Code)) 
    .OrderBy(x => x.Code) 
    .ToList(); 

生成的SQL的樣子：

SELECT 
    [Extent1].[Code] AS [Code], 
    // Other columns 
    FROM [dbo].[ScrapReasons] AS [Extent1] 
    WHERE NOT EXISTS (SELECT 
     1 AS [C1] 
     FROM [dbo].[QualityAlertRules] AS [Extent2] 
     WHERE [Extent2].[Code] = [Extent1].[Code] 
    ) 
    ORDER BY [Extent1].[Code] ASC 

Answer 2

你可以嘗試Except這樣

var DefectCode = PumaOEEEntities.ScrapReasons.Select(x=>x.Code) 
       .Except(PumaOEEEntities.QualityAlertRules.Select(y=>y.Code)).ToList();