Handle an event with a scope

EventHandlerScope.cs

/// <summary>
/// Handle an event with a scope, e.g.:
/// </summary>
/// <example>
/// <code>
/// using (new EventHandlerScope<FormClosedEventHandler>(
///     (s, e) => cts.Cancel(),
///     handler => form.FormClosed += handler,
///     handler => form.FormClosed -= handler))
/// {
///		...
/// }
/// </code>
/// </example>
public struct EventHandlerScope<TEventHandler> : IDisposable 
    where TEventHandler : Delegate
{
    readonly TEventHandler _handler;
    readonly Action<TEventHandler> _unsubscribe;

    public EventHandlerScope(
        TEventHandler handler, 
        Action<TEventHandler> subscribe,
        Action<TEventHandler> unsubscribe)
    {
        _handler = handler;
        _unsubscribe = unsubscribe;
        subscribe(handler);
    }

    void IDisposable.Dispose()
    {
        _unsubscribe(_handler);
    }
}