How to stop all tasks when one is finished in c#

Question

I have different tasks to read from different files and find a word into them. I have put them into a task array which I start with waitAny method as following :

foreach (string file in filesList)
        {
            files[i] = Task.Factory.StartNew(() =>
            {
                mySearch.Invoke(file);
            });
            i++;
        }
        System.Threading.Tasks.Task.WaitAny(files);

I would like to stop all other tasks as soon as one of the tasks finishes (it finishes when it founds the word). For the moment, with waitany, i can know when one tasks finishes, but I don't know how I could know which one has finished and how to stop other tasks. What would be the best way to achieve this ?

Answer 1

When creating a Task you can pass a CancelationToken. Set this token when one of the tasks finishes. This will cause remaining tasks with this token to not execute. Running tasks can receive a OperationCanceledException and stop too.