Microsoft.Extensions.AsyncState Namespace   
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Contains a class that represents a registered context within the asynchronous state.
Structs
| AsyncStateToken | Async state token representing a registered context within the asynchronous state. | 
Interfaces
| IAsyncContext<T> | Provides access to the current async context. Some implementations of this interface might not be thread safe. | 
| IAsyncState | Encapsulates all information within the asynchronous flow in an AsyncLocal<T> variable. Some implementations of this interface might not be thread safe. |