Running Function from Task.Run with Cancellation Token gives infinite loop

[Exoskeletor]

I have this function

private async Task SearchForAllNumbers(int num = -1)
{
if (num == -1)
DisplayLoadingMessage(true, GetString(Resource.String.Common_SearchTitle), GetString(Resource.String.Common_SearchMessage));
dates = DateFunctions.GetSelectedDates(DateFrom, DateTo);

        var list = string.Empty;
        var klirwseis = ", Κληρωσεις: ";
        if (num == -1)
            list = ListTextView.Text;
        else
            list = num.ToString();
        var nums = list.Split(',').Select(Int32.Parse).ToList();
        if (seperateCheckBox.Checked)
        {
            DisplayLoadingMessage(false);
            seperateCheckBox.Checked = false;
            for (int k = 0; k < nums.Count; k++)
            {
                await SearchForAllNumbers(nums\[k\]);
            }
            return -1;
        }
        var totalCoutner = 0;
        for (int datesPos = 0; datesPos <= dates.Count; datesPos++)
        {
           ... Do some calculations
            }
            HistoryTextView.Text = "Ημερομηνία: " + dates\[datesPos\] + ", Λίστα: " + list + ", Κληρώθηκε: " + totalCoutner + " φορές" + HistoryTextView.Text;
            if (showListsCheckBox.Checked)
                HistoryTextView.Text = klirwseis + HistoryTextView.Text;
        }
        DisplayLoadingMessage(false);
        HistoryTextView.Text = ".\\n" + HistoryTextView.Text;
        return totalCoutner;
        return 0;
    }

And i want to be able to cancel it when its running so i have created this function

private async Task SearchFoNumbersAsync()
{
ActiveCancellationTokenSource = new CancellationTokenSource();
DrawResultsTypeEnum searchType = (DrawResultsTypeEnum)ShowResultsSpinnerPosition;

        var task = Task.Run(async () =>
        {
            if (searchType == DrawResultsTypeEnum.AllNumbers)
                await SearchForAllNumbers();
            else if (searchType == DrawResultsTypeEnum.AnyWinningCombination)
                await SearchAnyWinningCombination();
            SaveHistory();
        }, ActiveCancellationTokenSource.Token); // Pass same token to Task.Run.

        try
        {
            await task;
        }
        catch (System.OperationCanceledException e)
        {

[Lost User]

Keep taking code out until it works, then start adding it back in. If nothing works, start over.

It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it. ― Confucian Analects: Rules of Confucius about his food

[Exoskeletor]

thanks, this helped, i found the reason of that but now i see that if i cancel the task, all the already running functions will keep running. im not sure if the best approach is to add some if (token.iscancellationrequested) or to make all the functions to tasks that can take a token

[Lost User]

[How to: Cancel a Task and Its Children | Microsoft Docs](https://docs.microsoft.com/en-us/dotnet/standard/parallel-programming/how-to-cancel-a-task-and-its-children)

It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it. ― Confucian Analects: Rules of Confucius about his food

[Exoskeletor]

I was reading this today but it looks to me like a worst idea of having a task that can take a cancellation token so i will try to find more approaches on how to cancel task and its childrends

[Lost User]

If you don't "like" MS samples, you're going to be in for a lot of headaches.

It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it. ― Confucian Analects: Rules of Confucius about his food

[Exoskeletor]

a general sample might not be the best solution for every situation. my code in the first post also is based on MS samples