Change Windows Lock Screen background image in C#

Question

Is there a way to change the lock screen image like the wall paper in c# using pinvoke.

[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern Int32 SystemParametersInfo(UInt32 action,
        UInt32 uParam, string vParam, UInt32 winIni);
private static readonly UInt32 SPI_SETDESKWALLPAPER = 20;
private static UInt32 SPIF_UPDATEINIFILE = 0x1;
private static uint MAX_PATH = 260;

// then I call
SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, file, SPIF_UPDATEINIFILE);

I'd like to do the same for the lockscreen (like the Bing Desktop app is doing)

Answer 1

Given your Windows 8-tag, yes you can:

LockScreen.SetImageFileAsync(), as demonstrated on Lock screen personalization sample in C# (error handling code omitted, check the sample):

StorageFile imageFile = await imagePicker.PickSingleFileAsync();

// Application now has access to the picked file, setting image to lockscreen.  
// This will fail if the file is an invalid format.
await LockScreen.SetImageFileAsync(imageFile);