ConfigurationItemFactory - Handle concurrent registration of extensions

[snakefoot]

See also: Lombiq/UI-Testing-Toolbox#239

2022-11-24 20:18:24.4539 Error Failed to add type 'NLog.Web.LayoutRenderers.AspNetRequestConnectionIdLayoutRenderer'. Exception: System.InvalidOperationException: Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.
   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at System.Collections.Generic.Dictionary`2.set_Item(TKey key, TValue value)
   at NLog.Config.Factory`2.RegisterDefinition(String itemName, Type itemDefinition, String assemblyName, String itemNamePrefix)
   at NLog.Config.Factory`2.RegisterType(Type type, String assemblyName, String itemNamePrefix)
   at NLog.Config.Factory`2.ScanTypes(Type[] types, String assemblyName, String itemNamePrefix)

Guessing this comes from concurrently creating multiple HostBuilders and calling AddNLogWeb() / UseNLog() that will register the same NLog.Web.AspNetCore-Assembly-extensions in parallel.

[sonarcloud]

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