Linq to SQL組並排名前25位

Question

我的數據庫中有兩個表，它們看起來像這樣：

用戶：

userid(int)
username(varchar)

得分：

scoreid(int)
result(bit)
attackinguserid(int) (same as User.userid)

它們還包含其他信息，但這並不重要。 我想要得到的是得分= true的前25位用戶，並按以下方式顯示他們：

Username: Won:
Peter     28
Mike      25
Kim       20

依此類推...我一直在嘗試的代碼是這樣的：

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();

但這給我在DataBind（）上的錯誤。 錯誤：用戶代碼未處理NotSupportedException。 成員'System.Web.UI.Page.Title'不支持SQL轉換。

Answer 1

解決了我的自我。 這是工作代碼：

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();

Answer 2

嘗試這個..

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();