WaitForExitAsync with a timeout-CodePudding

So I noticed that there's a method called WaitForExit that accepts and int as argument (milliseconds) so if the process isn't able to exit itself, I just killed it after some seconds.

Something like this.

if (!CMD.WaitForExit(3000))
    CMD.Kill();

The thing is that meanwhile I'd like to save the output, so I noticed that there's an async method WaitForExitAsync but this one doesn't accept these milliseconds.

// Wait for exit async...
// Meanwhile save the output till it kills itself.

while (CMD.StandardOutput.ReadLine() != null) 
    standard_output = StandardOutput.ReadLine();

Any idea how to do this? Thanks!

CodePudding user response：

You need to use CancellationTokenSource. It has a ctor which accepts a TimeSpan

var timeoutSignal = new CancellationTokenSource(TimeSpan.FromSeconds(3));
try 
{
   await CMD.WaitForExitAsync(timeoutSignal.Token);
} catch (OperationCanceledException)
{
   CMD.Kill();
}

When the CTS signals then the awaited operation will throw an OperationCanceledException. So you need to wrap your await call into a try-catch to handle cancelled operation properly.