collections - Is there an AddRange equivalent for a HashSet in C#

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With a list you can
do:

list.AddRange(otherCollection);

There
is no add range method in a HashSet.
What is the
best way to add another collection to a HashSet?

Answer

For
HashSet, the name is href="http://msdn.microsoft.com/en-us/library/bb342097.aspx"
rel="noreferrer">UnionWith.

This
is to indicate the distinct way the HashSet works. You cannot
safely Add a set of random elements to it like in
Collections, some elements may naturally
evaporate.

I think that
UnionWith takes its name after "merging with another
HashSet", however, there's an overload for
IEnumerable too.