LInq to Entity选择新的COUNT在哪里

Question

我创建了最复杂的linq查询，但仍然没有我所需要的。从这个查询中，我需要知道EventStudents表中有多少相关学生有DateDeleted == null。所以，StudentCount = ev.EventStudents - 其中DateDeleted == null .Count（）。 有人可以帮忙吗？

var inf = (from ev in db.Events
       where (ev.StartDate >= beginDate && ev.StartDate <= endDate)
        && ev.DeletedDate == null
       orderby ev.StartDate descending
       select new
      {
          EventID = ev.EventID,
          EventTitle = ev.Title,
          EventDate = ev.StartDate,
          StudentCount = ev.EventStudents.Count(),
          CreatedUsername = ev.CreatedUsername
      }).AsEnumerable().Select(x => new
      {
          EventID = x.EventID,
          EventTitle = x.EventTitle,
          EventDate = x.EventDate,
          StudentCount = x.StudentCount,
          CreatedUsername = x.CreatedUsername,
          CreatedFullname = sortedUserDictionary.Where(u => u.Value == x.CreatedUsername)
          .Select(f => f.Key)
          .FirstOrDefault() ?? x.CreatedUsername
      });

Answer 1

将ev.EventStudents.Count()更改为ev.EventStudents.Count(es => es.DateDeleted == null)。