c# - NSAutoReleasePool 和异步函数

Question

我的程序中有一个函数可以创建新的小部件来表示数据，但是每当创建小部件时，我都会收到很多“AutoRelease with no NSAutoReleasePool in place”错误消息。由于 NSAutoReleasePool 应该在主线程上自动创建，我有一种感觉，这些错误消息的出现是因为异步函数可能会创建我的线程......

该函数被调用来创建代表最新信息的小部件。这个函数经常被调用:

    private void CreateAndDisplayTvShowWidget (TvShow show)
    {
        var Widget = new TvShowWidgetController (show);
        Widget.OnRemoveWidget += ConfirmRemoveTvShow;

        Widget.View.SetFrameOrigin (new PointF (0, -150));
        Widget.View.SetFrameSize (new SizeF (ContentView.Frame.Width, 150));

        ContentView.AddSubview (Widget.View);
        show.ShowWidget = Widget;
    }

该函数通常在异步函数返回时被调用:

    private static void WebRequestCallback (IAsyncResult result)
    {
        HttpWebRequest request = (HttpWebRequest)result.AsyncState;
        HttpWebResponse response = (HttpWebResponse)request.EndGetResponse (result);

        StreamReader responseStream = new StreamReader (response.GetResponseStream ());
        string responseString = responseStream.ReadToEnd ();
        responseStream.Close ();

        ProcessResponse (responseString, request);
    }

ProcessResponse(responseString，请求)如下所示:

    private static void ProcessResponse (string responseString, HttpWebRequest request)
    {
        string requestUrl = request.Address.ToString ();

        if (requestUrl.Contains (ShowSearchTag)) {
            List<TvShow> searchResults = TvDbParser.ParseTvShowSearchResults (responseString);
            TvShowSearchTimeoutClock.Enabled = false;
            OnTvShowSearchComplete (searchResults);
        } else if (requestUrl.Contains (MirrorListTag)) {
            MirrorList = TvDbParser.ParseMirrorList (responseString);
            SendRequestsOnHold ();
        } else if (requestUrl.Contains (TvShowBaseTag)) {
            TvShowBase showBase = TvDbParser.ParseTvShowBase (responseString);
            OnTvShowBaseRecieved (showBase);
        } else if (requestUrl.Contains (ImagePathReqTag)) {
            string showID = GetShowIDFromImagePathRequest (requestUrl);
            TvShowImagePath imagePath = TvDbParser.ParseTvShowImagePath (showID, responseString);
            OnTvShowImagePathRecieved (imagePath);
        }
    }

CreateAndDisplayTvShowWidget (TvShow show) 在调用事件 OnTvShowBaseRecieved (TvShow) 时被调用，此时我收到大量有关 NSAutoReleasePool 的错误消息...

最后两个函数是跨平台程序集的一部分，因此我不能在其中包含任何 MonoMac 特定的代码...

我从来没有为我的小部件调用任何自动释放或释放代码，所以我假设 MonoMac 绑定(bind)会自动执行此操作作为其垃圾收集的一部分？

Answer 1

您可以在调用堆栈中的某个位置创建自动释放池，甚至可以在同一调用堆栈中创建多个嵌套的自动释放池。因此，您应该能够在异步入口函数中创建自动释放池。