"Specified cast is not valid." on android

[karlingen]

Getting a System.InvalidCastException from this line:

https://github.com/wislon/xfdemos/blob/master/src/xamformsdemo/xamformsdemo.Droid/Effects/ChangeColorSwitchEffect.cs#L73

protected override void OnDetached()
    {
      if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.JellyBean)
      {
        ((Switch)Control).CheckedChange -= OnCheckedChange;
      }
    }

It works on iOS. Any idea why?

[wislon]

I'm sorry I only saw this notification now... :(

I'm really not sure. I've just spun it up on a Nougat 7.1 device and it seems to work fine (just a clone, build, run). It's quite possible that newer versions of Android SDK and/or Xamarin Forms may be to blame (this demo is a bit old, I think I'll at least update the packages soon).

Last thing: did you try casting it to SwitchCompat instead? It might have been an oversight on my part (since the CheckedChange event wire-up was done to a SwitchCompat further up). In which case I apologise.