C# Observable Property

ObservableProperty.cs

// get an event when a property changes
public class ObservableProperty<T>
{
    T value;

    public delegate void ChangeEvent(T data);
    public event ChangeEvent changed;

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

    public void Set(T v)
    {
        if (!v.Equals(value))
        {
            value = v;
            if (changed != null)
            {
                changed(value);
            }
        }
    }

    public T Get()
    {
        return value;
    }

    public static implicit operator T(ObservableProperty<T> p)
    {
        return p.value;
    }
}

Example:

        var toggle = new ObservableProperty<bool>(false);
        toggle.changed += (b) => { print("A") };
        if (toggle) print("B");
        print("C");
        toggle.Set(true);
        print("D");
        toggle.Set(true);

Will output:

        CAD