Start C# function as background process

Question

I want to start the program without suspend. For example

private void button1_Click(object sender, EventArgs e)
{            
    test();
}

protected void test()
{            
    label1.Text = "";
    for (int i = 0; i < 10; i++)
    {
        label1.Text += i;
        Thread.Sleep(500);
    }
}

When I run this program the form suspend while cycle the end. How to make so that to run function test() without suspend the form, for example to run as background?

@Manta https://stackoverflow.com/questions/12414601/async-await-vs-backgroundworker — Salah Akbari, Nov 01 '18 at 12:01

Salah Akbari · Answer 1 · 2018-11-01T09:35:24.790

3

You can use Asynchronous programming, so make your method async like this:

protected async Task test()
{
    label1.Text = "";
    for (int i = 0; i < 10; i++)
    {
        label1.Text += i;
        await Task.Delay(500);
    }
}

And it would be better to use it, all the way down:

private async void button1_Click(object sender, EventArgs e)
{
    await test();
}

edited Nov 01 '18 at 09:35

answered Nov 01 '18 at 09:19

Salah Akbari

39,330
10
79
109

score 1 · Answer 2 · edited Nov 26 '18 at 08:05

Try the async await method (I also replaced Thread.Sleep with Task.Delay):

private async void button1_Click(object sender, EventArgs e)
{            
    await test();
}

protected async Task test()
{            
    label1.Text = "";
    for (int i=0;i<10;i++)
    {
        label1.Text += i;
        await Task.Delay(TimeSpan.FromMilliseconds(500)); //Thread.Sleep(500);
    }
}

If you are doing a lot of CPU work, you should do something like: await Task.Run(() => ...

You may find this async/await intro helpful.

Start C# function as background process

2 Answers2