Converting ICollection<> to KeyedCollection<>

I have a generic ICollection (lets say List<object>).  I want to create a System.Collections.ObjectModel.KeyedCollection<string, object> from it.

How can I "convert" the ICollection to a KeyedCollection without iterating though each element?  Can I set the underlying collection in the KeyedCollection to my ICollection?
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ChetOS82Asked:
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Joel CoehoornConnect With a Mentor Director of Information TechnologyCommented:
No.  You'll have to iterate.
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Jaime OlivaresSoftware ArchitectCommented:
it is not possible without iterating, even more when you have to specify the key for each element.
Who will "guess" the key for each element?
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Joel CoehoornDirector of Information TechnologyCommented:
@jaime: you have to inherit your own class from keyedcollection, and part of that is overriding an abstract method that will extract the key from the item.  
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Jaime OlivaresSoftware ArchitectCommented:
yeah, I know, I am trying to state that there is not a ready-made solution for this, for the reason explained.
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ChetOS82Author Commented:
As jcoehoorn said, there is no reason to specify the key, as it is determined from the value.

Anyway, after more research I agree with jcoehoorn.  The only way to add a value to a KeyedCollection is though the Add or SetItem methods.

I think the reason for this is because, internally, KeyedCollection is both an IList and an IDictionary and it can switch after a certain number of values have been added.  Even if there were a ICollection parameter in the constructor, it would still be iterating the collection.
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ChetOS82Author Commented:
Thanks
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