具有最短日期和加入次数的 Linq 组

Question

我正在尝试设置 PastEvents，一个 int，并且需要一些关于如何将最终的 EventCount 转换为 int 的指导。我收到错误“无法将类型‘System.Linq.IQueryable’隐式转换为‘int’”。我正在考虑使用 Sum() 或 FirstorDefault()。任何帮助将不胜感激。

PastEvents = from ev in
             (from ev in
                 ((from e in db.ActivityEventEntities
                   join d in db.ActivityEventDateEntities on e.EventID equals d.EventID
                   where e.ActivityID == 58
                   group new { e, d } by new
                   {
                     e.EventID
                     } into g
                     select new
                      {
                          EventID = (Int32?)g.Key.EventID,
                          StartDate = (DateTime?)g.Min(p => p.d.DateValue)
                                                   }))
                                          where
                                            ev.StartDate > DateTime.Now
                                          select new
                                          {
                                              Dummy = "x"
                                          })
                                     group ev by new { ev.Dummy } into g
                                     select new
                                     {
                                         EventCount = (Int64?)g.Count()
                                     }

Answer 1

select new
{
    EventCount = (Int64?)g.Count()
}.First().EventCount;