LINQ: Convert to IEnumerable from WhereSelectEnumerableIterator

How do you convert a WhereSelectEnumerableIterator<foo, E开发者_JAVA技巧ntitySet<blah>> to a IEnumerable<blah>

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Answer: I've used SelectMany

from MSDN:

Projects each element of a sequence to an IEnumerable and flattens the resulting sequences into one sequence.