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ThrowIfCancellationRequested

Context: ThrowIfCancellationRequested checks if the token has been cancelled and, if so, throws an OperationCanceledException.

using System.Threading;

public class Example
{
    public void Work(CancellationToken token)
    {
        token.ThrowIfCancellationRequested(); // throws if cancelled
        // More work...
    }
}

Manual checking

if (token.IsCancellationRequested)
{
    // cleanup before throwing
    token.ThrowIfCancellationRequested();
}

Real-world usage example

Responsive UI: Cancel a long‑running operation when the user clicks a “Cancel” button.

Example: Cancellation in managed threads