ASPNET MVC與EF-SUM＆GROUP BY

Question

我試圖將該SQL查詢轉換爲鏈接，但它不起作用。

SELECT 
SUM([Quantity]) as qt 
,[ArticleID] 
FROM [DB].[dbo].[Location] 
Group by ArticleID 
Order by qt 

List <Location> articles = contexteEF.Location.GroupBy(l => l.ArticleID).Select(a => new { qt = a.Sum(b => b.Quantity), ArticleID = a.Key }).OrderByDescending(a => a.qt).ToList(); 

你能幫助我嗎！請！

感謝

Answer 1

您嘗試投放動態對象的名單到List<Location>

我認爲位置具有的屬性qt和ArticleId？在這種情況下，請勿創建動態對象，創建位置。代碼未經測試，但類似於：

List <Location> articles = contexteEF.Location.GroupBy(l => l.ArticleID).Select(a => new Location() { qt = a.Sum(b => b.Quantity), ArticleID = a.Key }).OrderByDescending(a => a.qt).ToList();