[英]Linq to SQL group and count top 25
我的数据库中有两个表,它们看起来像这样:
用户:
userid(int)
username(varchar)
得分:
scoreid(int)
result(bit)
attackinguserid(int) (same as User.userid)
它们还包含其他信息,但这并不重要。 我想要得到的是得分= true的前25位用户,并按以下方式显示他们:
Username: Won:
Peter 28
Mike 25
Kim 20
依此类推...我一直在尝试的代码是这样的:
var winners = (from s in dc.Scores
from u in dc.Users
where (s.result) && (s.attackinguserid == u.userid)
group u by s
into groups
select new
{
Username= groups.Key,
Won= groups.Count()
}
).OrderByDescending(x => x.Seire).Distinct().Take(25);
gvBestPlayers.DataSource = winners; //gvBestPlayers = gridview
gvBestPlayers.DataBind();
但这给我在DataBind()上的错误。 错误:用户代码未处理NotSupportedException。 成员'System.Web.UI.Page.Title'不支持SQL转换。
解决了我的自我。 这是工作代码:
var winners = (from s in dc.Scores
from u in dc.Users
where (s.result) && (s.attackinguserid == u.userid)
group s by u
into groups
select new
{
Username= groups.Key.username,
Won= groups.Count()
}).OrderByDescending(x => x.Seire).Distinct().Take(25).ToList();
gvBestPlayers.DataSource = winners;
gvBestPlayers.DataBind();
尝试这个..
var a = (from s in dc.Scores
join u in dc.Users on s.attackinguserid equals u.userid
let count = dc.Scores.Where(id => id.attackinguserid == u.userid ).Count()
where s.result == true
select new { Username = u.username, Won = count }).ToList().Distinct();
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