ContentPage base class for Xamarin Forms

ContentPageBase.cs

using System.ComponentModel;
using System.Runtime.CompilerServices;
using Xamarin.Forms;

namespace ChargeNode
{
    public class ContentPageBase<T> : ContentPage where T : PageViewModelBase
    {
        protected T PageViewModel
        {
            get => BindingContext as T;
            set => BindingContext = value;
        }
    }

    public abstract class PageViewModelBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}