在Windows 10 IoT核心版上的Windows Universal App中手动触发屏幕键盘吗？

Question

For some reason the on-screen keyboard in Windows 10 IoT Core on raspberry pi 2 model b does not always come to front. (actually 99% it does not work).

is is possible to manually make a call in codebehind (for example when the OnFocus event happens) to show the osk?

Answer 1

The osk is actually a separate program, you could call it using the External Process Launcher API.
https://developer.microsoft.com/en-us/windows/iot/samples/externalprocesslauncher

From what I understand it is only available on Windows SDK: Version 15063 and up however.

I don't have the SDK installed at work so this code may be wrong, but it would look a bit like this:

var result = await ProcessLauncher.RunToCompletionAsync("C:\\Windows\\System32\\osk.exe", string.Empty);

Edit:
I'm thinking this may block the UI Thread though, which would be undesirable. Maybe if you run the task in the background though... Perhaps through the CoreDispatcher.
https://docs.microsoft.com/en-us/uwp/api/Windows.UI.Core.CoreDispatcher#Windows_UI_Core_CoreDispatcher_RunAsync_Windows_UI_Core_CoreDispatcherPriority_Windows_UI_Core_DispatchedHandler_

var ignored = dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () =>
    {
        await ProcessLauncher.RunToCompletionAsync("C:\\Windows\\System32\\osk.exe", string.Empty);
    });