Blank screen before loading mainwindow when navigating pages using frame.navigate in wpf application

Roseline_1 1

Blank screen can be seen when trying to download .xaml page, after few seconds page can be seen, Its requirement that we cant use splash screen while loading page
we are using .net framework 4.7.2 , Is there a way we can analyse why this issue is happening?
attached is part of code

Thanks
Roseline
26531-blankscreen.txt

DaisyTian-1203 11,621 Reputation points

2020-09-17T08:50:15.667+00:00

I can't reproduce the your issue. Does this happen to other pages which included in this project?
Roseline_1 1 Reputation point

2020-09-17T12:32:08.947+00:00

yes , all the pages i am trying to navigate in the process
DaisyTian-1203 11,621 Reputation points

2020-09-18T03:37:57.76+00:00

Could you try this function in a very simple demo to check if this happen?If this happen,please give the demo for me to analyze it.

Roseline_1 1

I am invoking the main window as follow

void ShowWindow(InstallerMode mode)
{

        // create the window on the application thread
        Dispatcher.Invoke((Action)delegate
        {
            _windowVisible = true;
            _window = new MainWindow(installer, mode);
            _window.Closed += new EventHandler(_window_Closed);
            _window.Show();
        });

        // wait for the window to close
        int sleepDuration = 50;
        while (_windowVisible)
        {
            System.Threading.Thread.Sleep(sleepDuration);
        }

    }

void _window_Closed(object sender, EventArgs e)
{
// notify that the window has closed
_windowVisible = false;
}

DaisyTian-1203 11,621 Reputation points

2020-09-24T02:53:08.45+00:00

I can't get the demo to run with the code you provided, could you give the details about StarterViewModel and StarterMode for me to reproduce the error?

1 answer

Roseline_1 1 Reputation point

2020-12-11T16:51:49.277+00:00

After analyzing it was found that in our code Mainwindow.xaml has frame which loads pages by navigation depending upon the input provided, first navigated page has lot of tasks and events to be triggered before it can be completely loaded, as a result its taking time for complete load of Mainwindow.xaml because of which blank screen is coming for that amount of time. To minimize the issue showing Mainwindow.xaml page first having spinner or wait in the frame and showing page in the frame only after it is loaded.

@DaisyTian-MSFT , creating demo helped us in finding root cause of it .
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Blank screen before loading mainwindow when navigating pages using frame.navigate in wpf application

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