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Dispose timeouts when disposing ServiceCache #5
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When Client object ref is disposed before all ServiceCache services timeout callbacks have been processed exception is thrown:
System.NullReferenceException: Object reference not set to an instance of an object.
at Mono.Ssdp.Internal.ServiceCache.Remove(String usn, Boolean fromTimeout)
at Mono.Ssdp.Internal.ServiceCache.TimeoutHandler(Object state, TimeSpan& interval)
at Mono.Ssdp.Internal.TimeoutDispatcher.TimerThread(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
at System.Threading.ThreadPoolWorkQueue.Dispatch()
This commit addresses such scenarios with calling Dispose on timeouts when ServiceCache Dispose is called.