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I’m developing a windows phone app, suppose my app is running, user click start key, my app will bring to background, then next user long press back key, the task manager will be shown. My question is here: How can update the screenshots of my app when it was brought to background? I don’t want expose anything of my app outside even in the task manager, could I do it? Thanks.
You cannot. And it’s not a task manager, but a “fast app switch”, allowing the user to easy swap between applications. The screenshot you see, will be the last screen of your application when it was in the foreground.
And your application will not be running in the background.