c# - 如何在不使用 Unity 协程的情况下在主线程上运行函数

Question

我看过一些关于使用协程在主线程上运行函数的文章，例如 Thread Ninja :

 IEnumerator StartExamples()
{
    //Jump to main thread
    yield return Ninja.JumpToUnity; 

    Destroy(someGameObject); //OK

    //Jump back to background thread
    yield return Ninja.JumpBack;  
}

它对我的代码不起作用，因为我想从套接字监听器跳转到主线程。

 SocketIOClient.Client socket;

 IEnumerator StartExamples()
 {
    socket.On("connect", (fn) =>
    {
        WriteLine("\r\nConnected event...\r\n");

        //Jump to main thread
        yield return Ninja.JumpToUnity; //ERROR: couldn't do a yield return 

        Destroy(someGameObject); 

        //Jump back to background thread
        yield return Ninja.JumpBack;  //ERROR: couldn't do a yield return 
    });
 }

那么我们有什么解决方法吗？我希望我能像这样跳转到主线程:

 Dispatcher.BeginInvoke(() =>
{
    //Unity API
    Destroy(gameObject);
});

Answer 1

根据我的评论，使用 uPromise ;

class Example
{
    private Promise BeginSocketConnection()
    {
        Deferred retPromise = new Deferred();

        socket.On("connect", (fn) =>
        {
            // We're no longer on the main thread ):
            // But we can resolve our promise!
            retPromise.Resolve();
        });

        return retPromise;
    }

    private void SocketConnectedSuccessfully()
    {
       // Executing on main thread
    }

    private void Start()
    {
        // We start in the main thread
        BeginSocketConnection().Done(x =>
        {
            SocketConnectedSuccessfully();
        });
    }
}

这不允许您在同一个代码块内的线程之间跳转，但通过使用回调系统，您可以提醒主线程执行一个操作，而无需启动杂乱的协程并在各处产生。更易于查看和维护。