Windows Presentation Foundation
A part of the .NET Framework that provides a unified programming model for building line-of-business desktop applications on Windows.
2,783 questions
WPF behavior when Windows OS is locked
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(268.8, 52%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAN%3C/text%3E%3C/svg%3E)
Andrey Nasonov
21
Reputation points
What happens to WPF window when Windows OS is locked? How WPF behaves? What happens to rendering is it suspended or something else?
How does the OS understand what needs to be resumed when we unlock windows user session?
{count} votes
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DaisyTian-1203 11,626 Reputation points2021-03-24T09:33:23.497+00:00 @Andrey Nasonov
Locking screen is used to prevent unwanted users from accessing the device's data. I created a test WPF project, its threads were running and the page rendered without any problems when the screen is locked. Did you meet any error with locking screen? -
Andrey Nasonov 21 Reputation points
2021-03-24T09:42:12.64+00:00 Hello
Yes, I meet a problem with locking screen and using WPF windows.
The source of the problem is using bitmap cache, described here: https://learn.microsoft.com/en-us/answers/questions/292299/wpf-rendering-issue-on-any-machine.html
I just try to find a solution how to replace BitmapCache and avoid that issue in my case.I created an issue on GitHub: https://github.com/dotnet/wpf/issues/4276
But how to resolve it I don't know exactly, and want to ask a question who knows how WPF rendering works and why using a cached elements invokes the problems.
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