CancellationTokenSource
CancellationTokenSource is a .NET type that creates and controls cancellation signals represented by CancellationToken values.
C# Concurrency: Asynchronous and multithreaded programming
CancellationTokenSource is a .NET object that creates and controls cancellation tokens, including by requesting cancellation.
- How it is used
- Coordinates cooperative cancellation for background work and asynchronous operations by separating cancellation requests from cancellation checks.
- How deep it goes
- Explains source-token separation, flag-based observation, delayed cancellation, timeouts, callbacks, and linked sources without detailing token internals.
- Examples
- Demonstrates cancellable background threads, long calculations, and HTTP requests canceled by either a user token or a timeout.
- What you can do after
- Operate/configure cooperative cancellation by creating sources, calling Cancel or CancelAfter, linking tokens, and passing tokens to cancelable operations.
.NET in Action, Second Edition
CancellationTokenSource is a .NET type that creates and controls cancellation signals represented by CancellationToken values.
- How it is used
- Coordinates stopping asynchronous file or network work when its result is no longer needed.
- How deep it goes
- Shows source creation, token checks, and forwarding through async calls; does not show the source being triggered.
- Examples
- Uses an asynchronous comic search that passes one source’s token to fetching tasks.
- What you can do after
- Apply it via .NET async APIs to pass a shared cancellation token into HTTP requests and deserialization.
Read how .NET in Action, Second Edition explains CancellationTokenSource →
Related concepts
- CancellationTokenproduces · CancellationToken is a .NET value that communicates a cooperative request to cancel an asynchronous or otherwise cancellable operation.
- timeoutconfigured by · A timeout is a configured time limit after which an incomplete operation or wait is stopped, abandoned, or treated as unsuccessful.
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