"c# linq lambda left join" Code Answer's
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c# linq lambda left join
// Option 1: Expecting either 0 or 1 matches from the "Right"
// table (Bars in this case):
var qry = Foos.GroupJoin(
Bars,
foo => foo.Foo_Id,
bar => bar.Foo_Id,
(f,bs) => new { Foo = f, Bar = bs.SingleOrDefault() });
// Option 2: Expecting either 0 or more matches from the "Right" table
// (courtesy of currently selected answer):
var qry = Foos.GroupJoin(
Bars,
foo => foo.Foo_Id,
bar => bar.Foo_Id,
(f,bs) => new { Foo = f, Bars = bs })
.SelectMany(
fooBars => fooBars.Bars.DefaultIfEmpty(),
(x,y) => new { Foo = x.Foo, Bar = y });
Source: stackoverflow.com
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