"is this using of dictionary thread-safe or not?" Code Answer
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there are 2 problems here:
lock (somedictionary)- this is dis-advised, even if the dictionary is not used elsewhere. it is a theoretical argument but the (future) code of the dictionary class could lock on itself.if (!somedictionary (e, out str))without a lock. i assume this is a call totrygetvalue(). this simply is not thread-safe, your read could be interrupted by a write in another thread. this could end in all sorts of errors (index out of range, null reference). the errors will be very rare (= hard to reproduce).