Observer Class

Observer Class in C#

public class Observer<T>
{
    public Observer() { }

    public Observer(T initValue)
    {
        value = initValue;
    }

    private T value;
    public T Value
    {
        get
        {
            return value;
        }
        set
        {
            this.value = value;
            if(OnChange != null)
            {
                OnChange(this.value);
            }
        }
    }
    private event ChangeValue OnChange;
    public delegate void ChangeValue(T value);

    public void Subscribe(ChangeValue subscribe)
    {
        OnChange += subscribe;
    }

    public void Unsubscribe(ChangeValue subscribe)
    {
        OnChange -= subscribe;
    }
}