字典异常中不存在给定的键

Question

I have a websocket server writed in c#C#. When i'm handling a packet from client in the server I get the error:

The given key ´4´ was not present in the dictionary.

This key exist. Other keys doesn't has this problem. The code pass the if statement.

string rawdata = Encoding.UTF8.GetString(decoded);
string[] msgdata = rawdata.Split("--");

int funcId = int.Parse(msgdata[0]);

if (Server.packetHandlersWS.ContainsKey(funcId)) {
    Server.packetHandlersWS[funcId](id, msgdata);
}

I tried cleanup on my project, i've tried delet the.pdb files in the project and rebuild. None of this fixes the problem.

Answer 1

Because packetHandlersWS is Dictionary<,> (from comments), there's a very good chance that you've corrupted the internal state, because you aren't doing any synchronization - and Dictionary<,> is not thread-safe. If this is the case, there's a very real chance that switching to ConcurrentDictionary<,> will fix this (note: you should still use TryGetValue with ConcurrentDictionary<,> , to avoid another race condition).