Transient MappingEngines won't be garbage collected with a singleton Configuration

[gwilson2151]

If your configuration is a singleton and you are using MappingEngines transiently as suggested here those MappingEngines won't be gc'ed. When constructing the MappingEngine it associates itself with the configuration via the EventHandler below and never disassociates itselfs from the configuration and as a result there's always a reference to the MappingEngine. Zombie MappingEngines!

public MappingEngine(IConfigurationProvider configurationProvider)
{
    _configurationProvider = configurationProvider;
    _mappers = configurationProvider.GetMappers();
    _configurationProvider.TypeMapCreated += ClearTypeMap;
}

[jbogard]

I've made IMappingEngine implement IDisposable to un-subscribe from these events. This should make MappingEngine back to the land of the living, let me know if it doesn't!

[lock]

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