(based on my other question here)
I have created the following async web-api-controller action, but it never returns
public async Task<string> Tester()
{
Task t = new Task(() => Thread.Sleep(2000));
await t;
return "OK";
}
what am I doing incorrectly?
It never returns because the task was never started, so it hangs. Call the Task.Start method:
Task t = new Task(() => Thread.Sleep(2000));
t.Start();
Or use Task.Run instead:
Task t = Task.Run(() => Thread.Sleep(2000));
Or use Task.Delay instead which is non-blocking (unless you used Thread.Sleep just for the sake of an example):
Task t = Task.Delay(2000);
Bear in mind that in a web application, everything except I/O-bound work should be synchronous. Deferring CPU-bound work to the thread pool won't buy you anything - if anything, it'll hurt performance.
See Stephen Cleary's Task.Run Etiquette Examples: Don't Use Task.Run in the Implementation
I tried it in console application and it worked!
What you only need to do is to start the task t:
static void Main(string[] args)
{
string test = Tester().Result;
Console.WriteLine(test);
}
public static async Task<string> Tester()
{
Task t = new Task(() => System.Threading.Thread.Sleep(2000));
t.Start();
await t;
return "OK";
}
