Fix warnings and messages in AsyncRx.NET #1894
Description
The AsyncRx.NET code is fairly old, so the current .NET SDK finds plenty to complain about. We need to resolve all compiler diagnostics to get a clean build on the latest SDK.
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The AsyncRx.NET code is fairly old, so the current .NET SDK finds plenty to complain about. We need to resolve all compiler diagnostics to get a clean build on the latest SDK.