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CRR0038 - The CancellationToken parameter is never used

This analyzer detects asynchronous methods that do not use the passed CancellationToken.

C#
VB.NET

Task<string> DemoMethodAsync(CancellationToken token) {
    DoThings();
    return Task.FromResult("Success");
}

Function DemoMethodAsync(ByVal token As CancellationToken) As Task(Of String)
    DoThings()
    Return Task.FromResult("Success")
End Function

All asynchronous methods should accept the CancellationToken parameter and use it to cancel a task if task cancellation was requested. Refer to the Task Cancellation article for more information.

C#
VB.NET

Task<string> DemoMethodAsync(CancellationToken token) {
    token.ThrowIfCancellationRequested();
    DoThings(token);
    return Task.FromResult("Success");
}

Function DemoMethodAsync(ByVal token As CancellationToken) As Task(Of String)
    token.ThrowIfCancellationRequested()
    DoThings(token)
    Return Task.FromResult("Success")
End Function

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