Can i cancel StreamReader.ReadLineAsync with a CancellationToken?

Question

When I cancel my async method with the following content by calling the Cancel() method of my CancellationTokenSource, it will stop eventually. How

Answer 1

You can't cancel Streamreader.ReadLineAsync(). IMHO this is because reading a single line should be very quick. But you can easily prevent the Console.WriteLine() from happening by using a separate task variable.

The check for ct.IsCancellationRequested is also redundand as ct.ThrowIfCancellationRequested() will only throw if cancellation is requested.

StreamReader reader = new StreamReader(dataStream);
while (!reader.EndOfStream)
{
    ct.ThrowIfCancellationRequested();
    string line = await reader.ReadLineAsync());

    ct.ThrowIfCancellationRequested();    
    Console.WriteLine(line);
}