System.InvalidOperationException when Cancel ThreadPool

[CyrilJ]

Hello,

I'm using this library for long-times but i recently had a problem :

Here the call stack (french sorry) :

System.InvalidOperationException: La collection a été modifiée; l'opération d'énumération peut ne pas s'exécuter.
à System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
à System.Collections.Generic.Dictionary`2.ValueCollection.Enumerator.MoveNext()
à Amib.Threading.SmartThreadPool.Cancel(Boolean abortExecution)

When watching the code of the method i think, it must create a copy of the values before looping on it. Replace :

foreach (ThreadEntry threadEntry in _workerThreads.Values)

by

var threadEntrys = _workerThreads.Values.ToList()
foreach (ThreadEntry threadEntry in threadEntrys )

[mvdhorstclb]

I resolved it by this PR: #39
Maybe not the most elegant solution, but this way we keep the lock correct.