Question

well, i make a loop that makes a lot of threads, see:

foreach (DataGridViewRow dgvRow in dataGridView1.Rows)
{

    Class h = new Class(dgvRow.Cells["name"].Value.ToString());

    Thread trdmyClass = new Thread(h.SeeInfoAboutName);
    trdmyClass.IsBackground = true;
    trdmyClass.Start();
}

This is working fine, creating the threads that i need, but i want to stop all this threads (using Thread.Abort()), in one time when i click on a button for e.g.
How can i do this?

Answer 1

You really shouldn’t use Thread.Abort(), it can be very dangerous. Instead, you should provide some way to signal to the threads that they are canceled. Each thread would then periodically check whether it’s canceled and end if it was.

One way to do this would be to use CancellationToken, which does exactly that. The framework methods that support cancellation work with this type too.

Your code could then look something like this:

// field to keep CancellationTokenSource:
CancellationTokenSource m_cts;

// in your method:

m_cts = new CancellationTokenSource();

foreach (DataGridViewRow dgvRow in dataGridView1.Rows)
{
    Class h = new Class(dgvRow.Cells["name"].Value.ToString());

    Thread trdmyClass = new Thread(() => h.SeeInfoAboutName(m_cts.Token));
    trdmyClass.IsBackground = true;
    trdmyClass.Start();
}

//somewhere else, where you want to cancel the threads:
m_cts.Cancel();

// the SeeInfoAboutName() method
public void SeeInfoAboutName(CancellationToken cancellationToken)
{
    while (!cancellationToken.IsCancellationRequested)
    {
        // do some work
    }
}