您好，
您说得这个API是在UWP中才可以用的，而在windows 8.1中是没有现成的API给你用的。
你可以用反射技术去调用windows 10 的API.
请参考我的代码：
private void Button_Click(object sender, RoutedEventArgs e)
{
var view = ApplicationView.GetForCurrentView();
var runtimemethods = view.GetType().GetRuntimeMethods();
if (!view.IsFullScreen)
{
var TryEnterFullscreenMode = runtimemethods.FirstOrDefault(x => x.Name == "TryEnterFullScreenMode");
TryEnterFullscreenMode?.Invoke(view, null);
}
}
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