c# linq extension methods left join

c# linq extension methods left join -

var leftJoin = p.Person.Where(n =&gt; n.FirstName.Contains("a"))
                       .GroupJoin(p.PersonInfo, 
                                  n =&gt; n.PersonId,
                                  m =&gt; m.PersonId,
                                  (n, ms) =&gt; new { n, ms = ms.DefaultIfEmpty() })
                       .SelectMany(z =&gt; z.ms.Select(m =&gt; new { n = z.n, m }));

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c# linq extension methods left join

c# linq extension methods left join -

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