Thread safety of a Dictionary with multiple concurrent readers and no writers

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For your future reference, the documentation is here:

http://msdn.microsoft.com/en-us/library/xfhwa508.aspx

It says:

A Dictionary
can support multiple readers
concurrently, as long as the
collection is not modified. Even so,
enumerating through a collection is
intrinsically not a thread-safe
procedure. In the rare case where an
enumeration contends with write
accesses, the collection must be
locked during the entire enumeration.
To allow the collection to be accessed
by multiple threads for reading and
writing, you must implement your own
synchronization.

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