Linq Query sub-selection issue

Question

The objects are WPF specific, but same thing...

        var v = Style.Triggers.Where(x => x is EventTrigger)
                              .Cast<EventTrigger>()
                              .Select(x => x.Actions);

At this point, I get 3 TriggerActionCollections which is correct. What I want to do next is select the items within each collection that are "is BeginStoryboard". I can't seem to work out how to select the items within Actions (the TriggerActionsCollection).

I was thinking something like this:

        var v = Style.Triggers.Where(x => x is EventTrigger)
                              .Cast<EventTrigger>()
                              .Select(x => x.Actions.Select(y => y).Where(y => y is BeginStoryboard));

But that isn't working. Any help guys?

For those non-wpf folks. Yes, there are 3 TriggerActionCollections and in one of those there is a BeginStoryBoard object. But for arguments sake I want EVERY BeginStoryBoard object flattened out.

Noxor · Answer 1 · 2017-09-23T15:01:05.313

1

Have you tried

var v = Style.Triggers.Where(x => x is EventTrigger)
                              .Cast<EventTrigger>()
                              .SelectMany(x => x.Actions)
                              .Where(...)

SelectMany instead of Select returns single collection instead of collection of collections.

edited Sep 23 '17 at 15:01

answered Sep 22 '17 at 23:51

Noxor

61
1
7

score 0 · Answer 2 · answered Sep 23 '17 at 15:58

0

var v = Style.Triggers
             .OfType<EventTrigger>()
             .SelectMany(x => x.Actions)
             .OfType<BeginStoryboard>();

answered Sep 23 '17 at 15:58

Michal Ciechan

13,492
11
76
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Reviewer here: I guess there's little point in telling you that one-line answers should n... – user35443 Sep 23 '17 at 19:58

Linq Query sub-selection issue

2 Answers2