如何将此Sql转换为Linq

Question

我将如何将此SQL编写为C＃Linq to Sql语句？

DECLARE @RET DATETIME

SET @RET = (SELECT MAX(EffectiveDate)
            FROM Material_Price
            WHERE Material_ID = @MatID
            AND EffectiveDate <= GetDate())

（今晚只是没来找我）

Answer 1

var time = db.Material_Price.Where(m => m.Material_ID == MatID
                                        && m.EffectiveDate <= DateTime.Today)
                            .Max(m => m.EffectiveDate);

Answer 2

我倾向于做这样的事情：

var time = db
    .Material_Price
        .Where(m => m.Material_ID == MatID)
        .Where(m => m.EffectiveDate <= DateTime.Today)
        .OrderByDescending(m => m.EffectiveDate)
        .First();