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# dotnet
s
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t
Yes, you’d need to flatten the collection, e.g. with 
SelectMany
, I think.
b
Thank you, I'll try that. Is there a docs you're aware of that covers this?
t
Not sure… if you have a repro snippet, I can take a look.
b
from the docs --> Implicit(T[] to InputList<T>) so applying a .ToArray() to the result SecurityRules = (_rules.Select(r => MapSecurityRules (r))).ToArray(), worked‼️
t
Yes, you can assign a collection to InputList
w
You'll still want to flatten first with 
SelectMany
?
b
Sean, do you have an example? Why would I "flatten" my yaml?
w
You have 
IEnumerable<IEnumerable<SecurityRuleArgs>>
presumably from inner 
MapSecurityRules
, so to flatten use:
Copy code
SecurityRules = _rules.SelectMany(rule => MapSecurityRules(rule)).ToArray() // or ToImmutableArray()
then if I read that correctly you should be able to use method group syntax:
Copy code
SecurityRules = _rules.SelectMany(MapSecurityRules).ToArray() // or ToImmutableArray()
You flatten it to unroll the inner enumerable into the outer enumerable, if that makes sense. i.e. effectively this converts 
IEnumerable<IEnumerable<SecurityRuleArgs>>
to 
IEnumerable<SecurityRuleArgs>
b
Excellent! thank you Sean
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