c# - 如何在 SignalR 客户端 Winforms 应用程序中打开 FolderBrowserDialog

Question

我在 ASP.net 网站上托管 SignalR 服务器，然后我想在客户端 WinForms 应用程序中打开 FolderBrowserDialog。服务器和客户端都正确连接，我什至在客户端收到消息，但是当我尝试在新线程中打开 FolderBrowserDialog 时，它只是没有打开它，之后什么也不做。

这是从 WebForms 发送消息的代码：

public void sendToSpecific(string name, string message, string to)
    {
        // Call the broadcastMessage method to update clients.
        Clients.Caller.broadcastMessage(name, message);
        Clients.Client(dic[to]).broadcastMessage(name, message);
    }

Winforms 代码是：

    private string _selectedFolder;
    HubConnection hubConnection;
    IHubProxy hubProxy;

    public Form1()
    {
        InitializeComponent();
        hubConnection = new HubConnection("http://localhost:49335");
        hubProxy = hubConnection.CreateHubProxy("ChatHub");
        hubProxy.On<string, string>("broadcastMessage", (name, message) => checkMessage(message));
        hubConnection.Start().Wait();
        hubProxy.Invoke("Notify", "Console app", hubConnection.ConnectionId);
    }

    private void checkMessage(string message)
    {
        if (message == "Open")
        {
            var t = new Thread((ThreadStart)(() =>
            {
                FolderBrowserDialog fbd = new FolderBrowserDialog();
                fbd.RootFolder = System.Environment.SpecialFolder.MyComputer;
                fbd.ShowNewFolderButton = true;
                if (fbd.ShowDialog() == DialogResult.Cancel)
                    _selectedFolder = "Cancelled";
                else
                {
                    _selectedFolder = fbd.SelectedPath;
                }
            }));

            t.SetApartmentState(ApartmentState.STA);
            t.Start();
            t.Join();

            lstMessages.Items.Add(_selectedFolder);
            hubProxy.Invoke("Send", "Console app", _selectedFolder).Wait();
        }
    }

谁能告诉我我做错了什么，我也已经在 static void Main() 之前设置了[STAThread] 。