private static Uri imgUri = new Uri("ms-appx:///pic1.jpg");

private async void btnSetWallpaper_Click(object sender, RoutedEventArgs e)    {        var msg = new MessageDialog("");        if (!UserProfilePersonalizationSettings.IsSupported())        {            //msg = new MessageDialog("人品太差，不支持哦！");            msg.Content = "人品太差，不支持哦！";            await msg.ShowAsync();        }        //获取文件        StorageFile file = await StorageFile.GetFileFromApplicationUriAsync(imgUri);        //设置背景        UserProfilePersonalizationSettings setting = UserProfilePersonalizationSettings.Current;        bool b = await setting.TrySetWallpaperImageAsync(file);        if (b)        {            msg.Content = "set ok！";            await msg.ShowAsync();        }        else        {            msg.Content = "can not set Wallpaper ！";            await msg.ShowAsync();        }    }

设置锁屏图片

private async void btnSetLockScreen_Click(object sender, RoutedEventArgs e)

{

var msg = new MessageDialog("");

if (!UserProfilePersonalizationSettings.IsSupported())

{

//msg = new MessageDialog("人品太差，不支持哦！");

msg.Content = "人品太差，不支持哦！";

await msg.ShowAsync();

}

//获取文件

StorageFile file = await StorageFile.GetFileFromApplicationUriAsync(imgUri);

//设置背景        UserProfilePersonalizationSettings setting = UserProfilePersonalizationSettings.Current;        bool b = await setting.TrySetLockScreenImageAsync(file);        if (b)        {            msg.Content = "set ok！";            await msg.ShowAsync();        }        else        {            msg.Content = "can not set lock screen！";            await msg.ShowAsync();        }    }