C# LINQ查询中单个表上的多个计数

我在LINQ查询中对单个表进行多次计数时遇到问题。我正在使用NHibernate、LINQ到NHibernate和C

查询是一个填充的列表。我有一个表，它有一个名为FullRef的布尔值。我想做一个LINQ查询，给出每个TrackId上FullRef=false和FullRef=true的发生次数。TrackId每次获得一个曲目时都会获得一个新行。Source==“UserRef”

在下面的查询中，我得到了FullRef=true的正确数字计数（来自FullRefTrueCount），但它在fullreffalsecont上给出了一个未知的错误数字

var query2 = from track in query
    where track.Source == "UserRef"
    group track by new { TrackId = track.TrackId, FullRef = track.FullRef } into d

    select new FullReferrer
    {
        Customer = d.Key.TrackId,
        FullRefFalseCount = d.Where(x => x.FullRef == false).Count(),
        FullRefTrueCount = d.Where(x => x.FullRef == true).Count()
    };

我还试图修改它，使其在GROUPBY中不包含FullRef。这是通过如下方式删除服务器上的FullRef=track.FullRef完成的

var query2 = from track in query
    where track.Source == "UserRef"
    group track by new { TrackId = track.TrackId } into d

    select new FullReferrer
    {
        Customer = d.Key.TrackId,
        FullRefFalseCount = d.Where(x => x.FullRef == false).Count(),
        FullRefTrueCount = d.Where(x => x.FullRef == true).Count()
    };

现在它给出了TrackId的总数，忽略了我的.Where（x=>x.FullRef==true/false）语句

有人知道怎么修吗？ 我想问题出在“组员”身上。我能不能避免分组？ 我可能需要加入吗？

尝试计数（条件）

尝试计数（条件）

试试这个

---

试试这个。这将从数据表中获取预期数据

string source = "UserRef";
var result = from row in dt.AsEnumerable()
             where row["source"].Equals(source)
             group row by row["TrackId"]
             into g
             select new
                {
                   TrackId = g.Key,
                   FullRefTrueCount = ((from track in g where track["FullRef"].Equals("true") select track).Count()),
                   FullRefFalseCount = ((from track in g where track["FullRef"].Equals("false") select track).Count())
                };

---

试试这个。这将从数据表中获取预期数据

string source = "UserRef";
var result = from row in dt.AsEnumerable()
             where row["source"].Equals(source)
             group row by row["TrackId"]
             into g
             select new
                {
                   TrackId = g.Key,
                   FullRefTrueCount = ((from track in g where track["FullRef"].Equals("true") select track).Count()),
                   FullRefFalseCount = ((from track in g where track["FullRef"].Equals("false") select track).Count())
                };

---

对于NHibernate，我不知道，但是使用Linq和实体框架应该可以得到您想要的：

var query2 = (
    from track in someDbSet
    select new FullReferrer
    {
          Customer = track.trackId
        , FullRefFalseCount = (from fullRefFalse in someDbSet.tracks
                               where fullRefFalse.IsSale == false 
                               && fullRefFalse.trackId == track.trackId
                               select fullRefFalse).Count()
        , FullRefTrueCount = (from fullRefTrue in someDbSet.tracks
                              where fullRefTrue.IsSale == true
                              && fullRefTrue.trackId == track.trackId
                              select fullRefTrue).Count()
    }
).Distinct();

---

对于NHibernate，我不知道，但是使用Linq和实体框架应该可以得到您想要的：

var query2 = (
    from track in someDbSet
    select new FullReferrer
    {
          Customer = track.trackId
        , FullRefFalseCount = (from fullRefFalse in someDbSet.tracks
                               where fullRefFalse.IsSale == false 
                               && fullRefFalse.trackId == track.trackId
                               select fullRefFalse).Count()
        , FullRefTrueCount = (from fullRefTrue in someDbSet.tracks
                              where fullRefTrue.IsSale == true
                              && fullRefTrue.trackId == track.trackId
                              select fullRefTrue).Count()
    }
).Distinct();

---

对于其他有类似问题的人，我通过将其设为“.AsEnumerable（）”来解决

var query2=from track in query.AsEnumerable（）/！x、 FullRef），
FullRefTrueCount=d.Count（x=>！x.FullRef）
};

对于其他有类似问题的人，我通过将其设为“.AsEnumerable（）”来解决

var query2=from track in query.AsEnumerable（）/！x、 FullRef），
FullRefTrueCount=d.Count（x=>！x.FullRef）
};

很抱歉，这对我不起作用。然后，查询没有给出任何结果（“枚举产生了任何结果”），很抱歉，这对我不起作用。然后查询根本不给出任何结果（“枚举产生了任何结果”），这就产生了完全相同的问题不幸的是，这就产生了完全相同的问题不幸的是，这也不起作用。假设您是指.Count（）而不是.Count。这也不起作用。假设您的意思是.Count（）而不是.Count。此转换为单个sql查询吗？此转换为单个sql查询吗？

var query2 = from track in query.AsEnumerable() // <--- the solution
    where track.Source == "UserRef"
    group track by new { TrackId = track.TrackId } into d

    select new FullReferrer
    {
        Customer = d.Key.TrackId,
        FullRefFalseCount = d.Count(x => !x.FullRef),
        FullRefTrueCount = d.Count(x => !x.FullRef)
    };