c# - Is it safe to call Add on SortedDictionary in one thread and get Item in another? -

i'm working on making sorteddictionary thread safe , thing i'm not sure is: safe have call add sorteddictionary in 1 thread, this:

dictionary.add(key, value); 

and item dictionary in thread, this:

variable = dictionary[key]; 

there no explicit enumeration in either of places, looks safe, great sure it.

no, not safe read , write sorteddictionary<k,v> concurrently: adding element sorted dictionary may involve re-balancing of tree, may cause concurrent read operation take wrong turn while navigating element of interest.

in order fix problem need either wrap instance of sorteddictionary<k,v> in class performs explicit locking, or roll own collection compatible interfaces implemented sorteddictionary<k,v>.