AsyncLocal value disappeared when Open a new window from loaded-event

fy w 1

when I run a wpf App, I set value to a global AsyncLocal variable and open the Second window at the Loaded-Event of MainWindow,when I click a button of the second window,the value of global AsyncLocal variable is null.But if I do this at a button click-event,it's ok.so I try to simulation the button click-event to open the second event,but it didn't work.I don't know what's wrong.

Jiale Xue - MSFT 43,046 Reputation points Microsoft Vendor

2022-09-02T09:13:56.11+00:00

Hi, @fy w . WPF clears the execution context after the Loaded event, which may cause the Asynclocal value to become null. I found some related links, you can refer to them. A: AsyncLocal in WPF is null after first set on the same thread and B: .net core AsyncLocal loses its value.
fy w 1 Reputation point

2022-09-05T03:08:17.523+00:00

I set this to a ContentRendered-event,it also can't work.I also try to use a delay task to do that,it also being null. at this scene,the loaded-event had finished.

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AsyncLocal value disappeared when Open a new window from loaded-event