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My Task is not getting cancel or aborted. if i could abort then count down will be stopped but ts.Cancel(); does not cancel the task. please see the code and guide me what to change in code.
CancellationToken ct;
CancellationTokenSource ts = new CancellationTokenSource();
private void button3_Click(object sender, EventArgs e)
{
int counter = 1;
Task.Factory.StartNew(() =>
{
while (true)
{
// do some heavy work here
Thread.Sleep(100);
if (ct.IsCancellationRequested)
{
// another thread decided to cancel
if (this.labelControl1.InvokeRequired)
{
this.labelControl1.BeginInvoke((MethodInvoker)delegate () { this.labelControl1.Text = "Task Cancel"; });
}
break;
}
else
{
if (this.labelControl1.InvokeRequired)
{
this.labelControl1.BeginInvoke((MethodInvoker)delegate () { this.labelControl1.Text = "counter "+ counter; });
counter++;
}
}
}
}, ct);
}
private void button4_Click(object sender, EventArgs e)
{
ts.Cancel();
}
Thanks
You can find a complete sample project on how to write with async/await and cancel a piece of work https://halfblood.pro/how-to-replace-backgroundworker-with-async-await-and-tasks-80d7c8ed89dc For simple apps, you never need Task.Factory.StartNew or .BeginInvoke. Before fully understanding the concepts, such functions should be avoided.
Try removing the ct and use ts.Token instead of ct.
@Viorel as per your suggestion i change the code and it worked. thanks a lot. here is restructured code.
private void button3_Click(object sender, EventArgs e)
{
int counter = 1;
ct = ts.Token;
Task.Factory.StartNew(() =>
{
while (true)
{
// do some heavy work here
Thread.Sleep(100);
if (ct.IsCancellationRequested)
{
// another thread decided to cancel
if (this.labelControl1.InvokeRequired)
{
this.labelControl1.BeginInvoke((MethodInvoker)delegate () { this.labelControl1.Text = "Task Cancel"; });
}
break;
}
else
{
if (this.labelControl1.InvokeRequired)
{
this.labelControl1.BeginInvoke((MethodInvoker)delegate () { this.labelControl1.Text = "counter "+ counter; });
counter++;
}
}
}
}, ct);
}
private void button4_Click(object sender, EventArgs e)
{
ts.Cancel();
}