与嵌套集合不同. [英] Distinct with nested collections.

问题描述

我有以下设置:

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;}
}

我正在尝试获取整个A中唯一标题的列表.
到目前为止，我已经

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);

但这是不对的，我无法展平" cTitle，至少我认为那是我错了.

But that''s not right, I can''t ''flatten'' cTitles, at least I think that''s what I''ve got wrong.

推荐答案

var titles = A.Bs
                .Select(b => b.Title)
                .Union(A.Bs.SelectMany(b => b.Cs, (b, c) => c.Title))
                .Distinct();

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