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See more: C# LINQ collections
I've got the following setup:

class A
{
   ObservableCollection Bs {get;set;}
}
class B
{
   string Title {get; set;}
   ObservableCollection<C> Cs {get;set;}
}
class C
{
   string Title {get;set;}
}

I'm trying to get a list of unique Title's in the entire of A.
So far I've got
var bTitles = A.Bs.Select(f=> f.Title).Distinct();
var cTitles = A.Bs.Select(f=> f.Cs).Select(h=> h.Select(g=> g.Title));
 
return bTitles.Union(cTitles);

But that's not right, I can't 'flatten' cTitles, at least I think that's what I've got wrong.
Posted 25-Oct-12 4:49am
cjb1104.9K

1 solution

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Solution 1

var titles = A.Bs
                .Select(b => b.Title)
                .Union(A.Bs.SelectMany(b => b.Cs, (b, c) => c.Title))
                .Distinct();
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Comments
cjb110 31-Oct-12 9:43am
   
Excellent thanks!

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