Every blog post I've read tells you how to consume an asynchronous method in C#, but for some odd reason never explain how to build your own asynchronous methods to consume. So I have this code right now that consumes my method:
private async void button1_Click(object sender, EventArgs e)
{
var now = await CountToAsync(1000);
label1.Text = now.ToString();
}
And I wrote this method that is CountToAsync
:
private Task<DateTime> CountToAsync(int num = 1000)
{
return Task.Factory.StartNew(() =>
{
for (int i = 0; i < num; i++)
{
Console.WriteLine("#{0}", i);
}
}).ContinueWith(x => DateTime.Now);
}
Is this, the use of Task.Factory
, the best way to write an asynchronous method, or should I write this another way?
I don't recommend StartNew
unless you need that level of complexity.
If your async method is dependent on other async methods, the easiest approach is to use the async
keyword:
private static async Task<DateTime> CountToAsync(int num = 10)
{
for (int i = 0; i < num; i++)
{
await Task.Delay(TimeSpan.FromSeconds(1));
}
return DateTime.Now;
}
If your async method is doing CPU work, you should use Task.Run
:
private static async Task<DateTime> CountToAsync(int num = 10)
{
await Task.Run(() => ...);
return DateTime.Now;
}
You may find my async
/await
intro helpful.