From Rx.NET in Action (formerly titled Reactive Extensions in Action)

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Rx.NET in Action teaches developers how to build event-driven applications using the Reactive Extensions (Rx) library.

 

The TakeUntil (by observable) operator - discard any items emitted by an Observable after a second Observable emits an item or terminates

The TakeUntil (by observable) operator – discard any items emitted by an Observable after a second Observable emits an item or terminates