Implement onkeydown event in xamarin forms

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Xamarin

HI, Is there any possible way to implement OnKeyDown event in Xamarin Forms portable class library, I am able to implement this in xamarin android but I need it in Xamarin Forms. Please suggest me some one. Thanks in advance

What I have tried:

protected override bool OnKeyDown(Keycode keyCode, KeyEvent e)
{
Console.WriteLine("A key was pressed");
return base.OnKeyDown(keyCode, e);
}

this code works in android but I need in Xamarin Forms portable class library