C# 该应用程序调用了一个为不同线程编组的接口 - Windows 应用商店应用程序
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The application called an interface that was marshalled for a different thread - Windows Store App
提问by Yecats
So, first I have read a ton of threads on this particular problem and I still do not understand how to fix it. Basically, I am trying to communicate with a websocket and store the message received in an observable collection that is bound to a listview. I know that I am getting a response back properly from the socket, but when it tries to add it to the observable collection it gives me the following error:
所以，首先我已经阅读了大量关于这个特定问题的线程，但我仍然不明白如何解决它。基本上，我正在尝试与 websocket 通信并将接收到的消息存储在绑定到列表视图的可观察集合中。我知道我从套接字正确地得到了一个响应，但是当它尝试将它添加到 observable 集合时，它给了我以下错误：
The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD))
I've read some information on "dispatch" as well as some other things, but I am just massively confused! Here is my code:
我已经阅读了一些关于“调度”以及其他一些事情的信息，但我非常困惑！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
}
And this is the binding:
这是绑定：
protected override async void OnNavigatedTo(NavigationEventArgs e)
{
//await Authenticate();
Gameboard.DataContext = Game.GameDetails.Singleton;
lstHighScores.ItemsSource = sendInfo.messageList;
}
How do I make the error go away while still binding to the observable collection for my listview?
如何在仍然绑定到我的列表视图的可观察集合的同时使错误消失？
采纳答案by various
This solved my issue:
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
回答by Baldrick
Try replacing
尝试更换
messageList.Add(read);
with
和
Dispatcher.Invoke((Action)(() => messageList.Add(read)));
If you're calling from outside your Window class, try:
如果您从 Window 类外部调用，请尝试：
Application.Current.Dispatcher.Invoke((Action)(() => messageList.Add(read)));
回答by Melbourne Developer
Slight modification for task based async methods but the code in here will not be awaited.
对基于任务的异步方法稍作修改，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();
This code WILL await, and will allow you to return a value:
此代码将等待，并允许您返回一个值：
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;
}
And on Android:
而在安卓上：
private async Task<string> GetPin()
{
var taskCompletionSource = new TaskCompletionSource<string>();
RunOnUiThread(async () =>
{
var pin = await UI.GetPin();
taskCompletionSource.SetResult(pin);
});
return await taskCompletionSource.Task;
}
