將SQL語句轉換爲Linq-2-Sql

Question

如何將下列SQL語句轉換爲L2S？

SELECT DefaultCode, MAX(EffectiveDt) AS EffectiveDt 
FROM tblDF_DefaultSetting 
GROUP BY DefaultCode 

Answer 1

您想使用DefaultCode的GroupBy操作和使用Select操作員與兩個值創建一個新的匿名類你感興趣的內容。

dataContext.tblDF_DefaultSetting 
    .GroupBy(x => x.DefaultCode) 
    .Select(x => new { DefaultCode = x.Key, EffectiveDt = x.Max(x => x.EffectiveDt) });