Aborting a Service safe

Hi,

I have a service that do some work with a polling intervall.

Task task = new Task( delegate { DoWork(); });

task.Wait(Convert.ToInt32(ConfigurationManager.AppSettings["PollingInterval"]));

task.RunSynchronously();

My question is how to abort the Task safe?

Is it enough with

try

{

Task task = new Task( delegate { DoWork(); });

task.Wait(Convert.ToInt32(ConfigurationManager.AppSettings["PollingInterval"]));

task.RunSynchronously();

}

catch (ThreadAbortException threadAbortException)

{

// Clean up

}

Sample code for cancellation a task

using System;
using System.Threading;
using System.Threading.Tasks;
class Program
{
static async Task Main()
{
var tokenSource2 = new CancellationTokenSource();
CancellationToken ct = tokenSource2.Token;
var task = Task.Run(() =>
{
// Were we already canceled?
ct.ThrowIfCancellationRequested();
bool moreToDo = true;
while (moreToDo)
{
// Poll on this property if you have to do
// other cleanup before throwing.
if (ct.IsCancellationRequested)
{
// Clean up here, then...
ct.ThrowIfCancellationRequested();
}
}
}, tokenSource2.Token); // Pass same token to Task.Run.
tokenSource2.Cancel();
// Just continue on this thread, or await with try-catch:
try
{
await task;
}
catch (OperationCanceledException e)
{
Console.WriteLine($"{nameof(OperationCanceledException)} thrown with message: {e.Message}");
}
finally
{
tokenSource2.Dispose();
}
Console.ReadKey();
}
}

Source:

https://docs.microsoft.com/en-us/dotnet/standard/parallel-programming/task-cancellation

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Amit Gupta5y ago
Sample code for cancellation a task
using System;
using System.Threading;
using System.Threading.Tasks;

class Program
{
    static async Task Main()
    {
        var tokenSource2 = new CancellationTokenSource();
        CancellationToken ct = tokenSource2.Token;

        var task = Task.Run(() =>
        {
            // Were we already canceled?
            ct.ThrowIfCancellationRequested();

            bool moreToDo = true;
            while (moreToDo)
            {
                // Poll on this property if you have to do
                // other cleanup before throwing.
                if (ct.IsCancellationRequested)
                {
                    // Clean up here, then...
                    ct.ThrowIfCancellationRequested();
                }
            }
        }, tokenSource2.Token); // Pass same token to Task.Run.

        tokenSource2.Cancel();

        // Just continue on this thread, or await with try-catch:
        try
        {
            await task;
        }
        catch (OperationCanceledException e)
        {
            Console.WriteLine($"{nameof(OperationCanceledException)} thrown with message: {e.Message}");
        }
        finally
        {
            tokenSource2.Dispose();
        }

        Console.ReadKey();
    }
}
Source:
https://docs.microsoft.com/en-us/dotnet/standard/parallel-programming/task-cancellation
Amit Gupta5y ago
When you use a Task class then you can use CancellationToken to cancel the task.