Hi , I need help to abort a task running under awiat async

My solution is:

1. The C#.NET tasks cancelation mechanism will work regardless of whether it is an async-await or regular synchronous button click event handler;

2. Please make sure that you are using CancellationTokenSource object in your C# code;


3. Please make sure that you are performing a check if CancellationTokenSource.IsCancellationRequested property value is "true" prior to each driver installation phase within the asynchronous task spawned;

4. Please make sure that you've implemented a separate handler for cancelation button click and invoke CancellationTokenSource.Cancel() method;


Here's how: (e.g. the following code below implements a System.Windows.Form windows-based application having two buttons. The first button normally launches adding driver task. In this case it spawns a task that displays a message box repeatedly in the ethernal loop, simulation the driver installation work. To spawn the task all you need is to click on Add Driver... button. To cancel the so-called "driver installation", you have to toggle cancel task button and the message boxes will no longer be displayed indicating that the specific task has been cancelled:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        static public CancellationTokenSource 
            tokenAddDriverSource = new CancellationTokenSource();
        public Form1()
        {
            InitializeComponent();
            
        }
        private async void BtnAddDriver_Click(object sender, EventArgs e)
        {
            try {
                try
                {
                    await Task.Factory.StartNew(() =>
                    {
                        bool isCanceled = false;
                        while (isCanceled == false)
                        {
                            // Adding driver Phase #1
                            if (tokenAddDriverSource.IsCancellationRequested)
                                isCanceled = true;

                            MessageBox.Show("Fire Do Action in protect to get the driver details after adding the driver in protect");

                            // Adding driver Phase #2
                            if (tokenAddDriverSource.IsCancellationRequested)
                                isCanceled = true;

                            // ....
                            // Adding driver Phase #N
                            if (tokenAddDriverSource.IsCancellationRequested)
                                isCanceled = true;
                        }
                    }, tokenAddDriverSource.Token);
                }
                catch (Exception ex)
                {
                }
                finally
                {
                }
            }
            catch (Exception ex)
            {
            }
            finally
            {
            }
        }
        private void CancelTask_Click(object sender, EventArgs e)
        {
            tokenAddDriverSource.Cancel();
        }
    }}

And, one more thing: to perform task cancelation properly, you would better, divide the entire driver installation process into several phases and execute the following code prior to driver installation each phase:

// ....
// Adding driver Phase #N
if (tokenAddDriverSource.IsCancellationRequested)
    isCanceled = true;

That's all :)