c# - Duplicate keys in Dictionary<string,EventHandler> -

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i have

public static readonly dictionary<string, eventhandler> cachehandlers = new dictionary<string, eventhandler>();

and have duplicate keys in dictionary:

debugger screenshot: http://i.stack.imgur.com/tuxi7.png

how happen?

is bug in .net framework or artifact of concurent usage?

msdn states dictionarys might not thread safe.

if concurrently reading dictionary, might safe long lock dictionary when add new key/value pairs.


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