I'd be afraid of the efficiency. Is there a better way?
closed as not a real question by Maik Semder, Byte56♦, John McDonald, msell, Anko May 24 '13 at 13:05
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Yes, it's perfectly fine to use a string as a key to look up resources. The "efficiency" of the check (the string comparison) isn't that damning on its own, especially if you do it intelligently and employ reasonable caching behavior, and so on.
A string has several advantages as well, such as affording you more data-driven flexibility than an enumeration will (since adding or changing enumerations usually means rebuilding code).
If the string look-ups ever do become a problem, according to your profiler, you can consider changing them to something else at that point.