how to pause or resume a task

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I am using task class recently and there is a question about pausing or resuming a task.As we know,when new task starts,a relative thread is also created, how can I pause or resume the task during its running course?

For a example:

C#

private void button1_Click(object sender, EventArgs e)
{
    Task task1 = Task.Factory.StartNew(needMuchTimeWork);
}

public void needMuchTimeWork()
{
    //here is a work that need much time
}

private void button2_Click(object sender, EventArgs e)
{
    //here i want to pause task1,how to do it??
}

Posted 15-Nov-11 23:49pm

wuxi_taihu

Updated 15-Nov-11 23:51pm

Slacker007

v3

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Slacker007 16-Nov-11 5:52am

Edit: spelling and readability.

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Manfred Rudolf Bihy · Answer 1 · 2011-11-16T00:52:00

In the button1 click handler the Task variable is local to the handler method. In order for you to be able to access said Task variable you'd have to declare it as a class field.

C#

// Make Task task1 a class level variable
Task task1 = null;

private void button1_Click(object sender, EventArgs e)
{
    // Here we access the class field task1
    task1 = Task.Factory.StartNew(needMuchTimeWork);
}

public void needMuchTimeWork()
{
    //here is a work that need much time
}

private void button2_Click(object sender, EventArgs e)
{
    // Here we call the Pause method or whatever it is called. I also postulate there
    // is a predicate that indicates wether a task is paused or not whith a signature:
    // bool IsPaused().
    if(task1 != null && !task1.IsPaused())
    {
        task1.Pause();
    }
}