How to stop an await Task?

Question

private async void button1_Click_1(object sender, EventArgs e)
{
    foreach (var word in GetWords())
    {
        richTextBox1.Text += (word + ' ');
        await Task.Delay(hız);

        Size textSize = TextRenderer.MeasureText(richTextBox1.Text, richTextBox1.Font,
            richTextBox1.Size, flags);

        if (textSize.Height >= (richTextBox1.Height - 40))
        {
            richTextBox1.Clear();
        }
    }  
}

This is the code that I use. It works, but I want to stop it any time and then continue from where I leave. The problem is I don't know how to stop.

Answer 1

If you want pause and continue a task, the simple way is to use a boolean like :

private volatile bool _isPaused = false;
private async void button1_Click_1(object sender, EventArgs e)
{
    foreach (var word in GetWords())
    {
        richTextBox1.Text += (word + ' ');

        do
        {
            await Task.Delay(hız);
        } while (_isPaused);

        Size textSize = TextRenderer.MeasureText(richTextBox1.Text, richTextBox1.Font, richTextBox1.Size, flags);


        if (textSize.Height >= (richTextBox1.Height - 40))
        {
            richTextBox1.Clear();
        }
    }
}

private async void pauseContinue_Click(object sender, EventArgs e)
{
    _isPaused = !_isPaused;
}

The volatile keyword is to manipulate primitive variable in thread-safe way.