Keep CurrentCulture in async/await

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Culture does not flow in the .NET Framework, a very notorious problem. It is very hard to solve on Windows, culture is an unmanaged property of a thread so the CLR can’t ensure it is always set correctly. That makes tinkering with the CurrentCulture on the main thread a big fat mistake. The bugs you get are very hard to diagnose. Like a SortedList you create on one thread that suddenly isn’t sorted anymore on another. Yuck.

Microsoft did something about it in .NET 4.5, they added the CultureInfo.DefaultThreadCurrentCulture property. Also DefaultThreadCurrentUICulture. That still does not guarantee it will be set correctly, unmanaged code you call can change it and the CLR cannot do anything about it. In other words, a bug will be much harder to diagnose. But at least you have some idea when it might change.

UPDATE: this problem was fixed thoroughly in .NET 4.6, culture now flows from one thread to another and the CultureInfo.DefaultThreadCurrentCulture hack is not longer necessary nor useful. Documented in the MSDN article for CultureInfo.CurrentCulture. Details as written right now do not appear to be entirely correct, it always flowed when I tested it and DefaultThreadCurrentCulture appear to play no role at all anymore.

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