Question

所以，首先我已经阅读了很多关于这个特定问题的线索，我仍然不明白如何解决它。基本上，我正在尝试与websocket进行通信，并将收到的消息存储在绑定到listview的可观察集合中。我知道我正在从套接字中正确地获得响应，但是当它试图将它添加到observable集合时，它会给我以下错误：

The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD))

我已经阅读了一些关于“发送”以及其他一些事情的信息，但我只是大肆混淆！这是我的代码：

public ObservableCollection<string> messageList  { get; set; }
private void MessageReceived(MessageWebSocket sender, MessageWebSocketMessageReceivedEventArgs args)
    {
        string read = "";
        try
        {
            using (DataReader reader = args.GetDataReader())
            {
                reader.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf8;
                read = reader.ReadString(reader.UnconsumedBufferLength);
            }
        }
        catch (Exception ex) // For debugging
        {
            WebErrorStatus status = WebSocketError.GetStatus(ex.GetBaseException().HResult);
            // Add your specific error-handling code here.
        }


        if (read != "")
           messageList.Add(read); // this is where I get the error

    }

这就是约束力：

protected override async void OnNavigatedTo(NavigationEventArgs e)
{
    //await Authenticate();
    Gameboard.DataContext = Game.GameDetails.Singleton;
    lstHighScores.ItemsSource = sendInfo.messageList;
}

如何在仍然绑定到listview的observable集合时使错误消失？

Answer 1

这解决了我的问题：

Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
() =>
    {
        // Your UI update code goes here!
    }
);

Correct way to get the CoreDispatcher in a Windows Store app

Answer 2

尝试替换

messageList.Add(read);

与

Dispatcher.Invoke((Action)(() => messageList.Add(read)));

如果您从Window类外部打电话，请尝试：

Application.Current.Dispatcher.Invoke((Action)(() => messageList.Add(read)));

Answer 3

对基于任务的异步方法进行轻微修改，但不会等待此处的代码。

await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
() =>
{
    // Your UI update code goes here!
}
).AsTask();

此代码将等待，并允许您返回值：

    private async static Task<string> GetPin()
    {
        var taskCompletionSource = new TaskCompletionSource<string>();

        CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
        async () =>
        {
            var pin = await UI.GetPin();
            taskCompletionSource.SetResult(pin);
        }
        );

        return await taskCompletionSource.Task;
    }

在Android上：

    private async Task<string> GetPin()
    {
        var taskCompletionSource = new TaskCompletionSource<string>();

        RunOnUiThread(async () =>
        {
            var pin = await UI.GetPin();
            taskCompletionSource.SetResult(pin);
        });

        return await taskCompletionSource.Task;
    }

该应用程序称为为不同线程编组的接口--Windows Store App

3 个答案: