Linq回归第一次约会

Question

我有查询:

var q = db.tblArcadeGamePlays
    .Where(c => c.GameID == GameID && c.ReferalID != 0 && c.ReferalID != null)
    .GroupBy(r => new { r.ReferalID })
    .Select(g => new { Plays = g.Count(), URL = g.Key.ReferalID })
    ;       

tblArcadeGamePlays还有一个字段Date,在该组中我想返回该组包含的最早观察日期.

我该怎么做？

Answer 1

.Select(g => new {
       Plays = g.Count(), URL = g.Key.ReferalID,
       MinDate = g.Min(x => x.Date
});

您可能还会发现LINQ语法在这里更容易阅读/维护,但是...扩展语法也可以.但是作为LINQ:

var q = from c in db.tblArcadeGamePlays
        where c.GameID == GameID && c.ReferalID != 0 && c.ReferalID != null
        group c by c.ReferalID into g
        select new {
            Plays = g.Count(), URL = g.Key.ReferalID, MinDate = g.Min(x=>x.Date)
        };