Observable.FromEventHandler订阅动作

Question

使用Reactive Extensions，使用Observable.FromEventHandler订阅Control事件非常简单;但是，当涉及到自定义控件的Actions时，我无法使用相同的方法订阅它们的调用，因为它会导致错误说

An exception of type 'System.InvalidOperationException' occurred in System.Reactive.Linq.dll but was not handled in user code

我的自定义控制代码

public partial class Hub : UserControl
{
    public Action<bool> OnButtonStartClick { get; set; }

    public Hub()
    {
        Observable.FromEventPattern(buttonHide, "Click", new ControlScheduler(this)).Subscribe(_ =>
        {
            if (null != OnButtonHideClick)
                OnButtonHideClick.Invoke(true);
        });
    }
}

尝试订阅如下

private void InitializeEventHandlers()
{
    Observable.FromEventPattern(MainHub, "OnButtonStartClick").Subscribe(_ =>
    {
          //DO SOMETHING AS USUAL!
    });
}