c# - LINQ - Join 2 tables, Group by DateTime.Month , multiple Counts -

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i'm pretty new c# , linq , i'm trying list of emails holds sum of emails, attachments , user's (the one's sent email).

so current problem output of query false. number of email's equal number of attachment's obvious wrong. query:

var monthquery = em in dbedoka.email                           join ema in dbedoka.email_attachment on em.id equals ema.email_id e                           e2 in e.defaultifempty()                           group e2 em.erstellt_am.month grouped                           select new entities.month                           {                               nameofmonth = grouped.firstordefault().erstellt_am.tostring(),                               numberofmails = grouped.distinct().count(m => m.email_id != null).tostring(),                               numberofattachments = grouped.count(a => a.id != null).tostring(),                               numberofusers = grouped.select(u => u.erstellt_von).distinct().count().tostring()                           };           months = monthquery.tolist();         months = collectionviewsource.getdefaultview(months);

as can see had take m.email_id dbedoka.email_attachment instead of m.id dbedoka.email because wasn't avaliable (don't know why...). yet have count "numberofmails", "numberofattachments" , "numberofusers".

thank you!


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