System.Exception: 'Invalid window handle' by CoreApplication.RequestRestartAsync("")

Hong 1,051

Could anyone shed some light on what may cause System.Exception: 'Invalid window handle' thrown by CoreApplication.RequestRestartAsync("")?

Daniele 1,996 Reputation points

2020-06-06T21:21:34.583+00:00

I used it without problems, so I wonder if the problem is related to the moment you call it. In which state is the app when you call RequestRestartAsync? On the UI thread or on another thread? It is running on a desktop or on other device? Which TargetPlatformVersion and TargetPlatformMinVersion?

Hong 1,051

Thank you for looking into it. I should have posted the code snippet:

await Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
    async () => {

        try
        {
            AppRestartFailureReason arfr = await CoreApplication.RequestRestartAsync("");
            if (arfr == AppRestartFailureReason.NotInForeground
                || arfr == AppRestartFailureReason.Other)
            {
                Utility.LogMessageJsonAsync("Restarting failed: " + arfr);
            }
            else
            {
                //do nothing
            }
        }
        catch (Exception ex)
        {
            Utility.LogMessageJsonExAsynch("Exception from await CoreApplication.RequestRestartAsync():", ex);
        }
    });

It was running on a desktop. I also should have mentioned this happens only occasionally. The UWP app targets 18632.

Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,856 Reputation points

2020-06-08T07:41:47.597+00:00

Yep, I run above code within a blank uwp app, and it does not throw any exceptions, I could not reproduce your issue, could you mind share a demo that could reproduce this problem that will be better to find the reason.

1 answer

Jack Anderson 1 Reputation point

2020-06-06T20:54:38.597+00:00

A simple restart of the app should solve this.
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