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c# - LINQ Guarantees Ordering with SelectMany?

I have an array of ordered enumerables IorderedEnumerable<T>[] foo and I want to flatten it so that the ordered enumerables of foo are concatenated together in the order they are stored in the array.

For example {{1, 2, 3}, {4, 5}, {6}} => {1, 2, 3, 4, 5, 6}

Can I do this by IOrderedEnumerable<T> bar = foo.SelectMany(x => x);, or does LINQ not guarantee how order is handled when flattening?

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All LINQ to Objects methods (except, obviously, OrderBy() and ToDictionary()) will preserve source ordering.


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