Observable property base class for Xamarin Forms (applicable to WPF as well, just remove the ContentPageBase class)

ObservableProperty.cs

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

namespace ChargeNode
{
    [DefaultProperty("Value")]
    public class ObservableProperty<T> : ObservablePropertyBase
    {
        private T _value;

        public ObservableProperty() { }
        public ObservableProperty(T value)
        {
            Value = value;
        }

        public T Value
        {
            get => _value;
            set { _value = value; OnPropertyChanged(); }
        }

        public static bool operator ==(ObservableProperty<T> self, T other)
        {
            return self._value.Equals(other);
        }

        public static bool operator !=(ObservableProperty<T> self, T other)
        {
            return !self._value.Equals(other);
        }
    }

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

    public abstract class ObservablePropertyBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged([CallerMemberName] string propertyName = null) =>
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}