SignalR-从自托管控制台服务器调用WPF客户端方法

本文关键字：调用 WPF 客户端 方法 服务器 控制台 SignalR- | 更新日期: 2023-09-27 17:58:25

我遵循了本教程，并成功地设置了Client->Server和Server->Client实时通信演示。然而，当试图在WPF项目（而不是控制台项目）中重新创建相同的场景时，我似乎无法从SignalR Hub调用WPF项目的方法。

注意：WPF项目和自托管控制台项目位于相同的Visual Studio解决方案中

SignalR集线器：（在自主机服务器控制台项目中）

public class TestHub : Hub
{
    public void NotifyAdmin_Signup()
    {
        Clients.All.NotifyStation_Signup();
        //This should call the WPF Project's NotifyStation_Signup() method
    }
}

启动服务器&从同一控制台调用Hub方法：

class Program
{
    static void Main(string[] args)
    {
        //Start the Local server
        string url = @"http://localhost:8080/";
        using (WebApp.Start<Startup>(url))
        {
            Console.WriteLine(string.Format("Server running at {0}", url));
            Console.ReadLine();
        }
        IHubContext hubContext = GlobalHost.ConnectionManager.GetHubContext<TestHub>();
        hubContext.Clients.All.NotifyAdmin_Signup();
    }
}

WPF项目中的MainWindow.xaml.cs：

public partial class MainWindow : Window
{
    public MainWindow()
    {
         InitializeComponent();
         var hubConnection = new HubConnection("http://localhost:8080/");
         IHubProxy _hub = hubConnection.CreateHubProxy("TestHub");
         hubConnection.Start().Wait();
         //Call a local method when the Server sends a signal 
         _hub.On("NotifyStation_Signup", x => PrintAccountCount());
    }
    //This never gets called :(
    private void PrintAccountCount()
    {
         //Display a Message in the Window UI
         var dispatcher = Application.Current.Dispatcher;
         dispatcher.Invoke(() => counter_accounts.Content = "I got the signal!");
    }
}

不存在任何错误。WPF项目的"NotifyStation_Signup"方法从未被服务器调用。我做错了什么？

SignalR-从自托管控制台服务器调用WPF客户端方法

解决了它！我犯了一个愚蠢的错误，在using（）方法之外调用了hub方法：

static void Main(string[] args)
{
    //Start the Local server
    string url = @"http://localhost:8080/";
    using (WebApp.Start<Startup>(url))
    {
        Console.WriteLine(string.Format("Server running at {0}", url));
        //Instead of having the following two lines outside of this, 
        //I put it in here and it worked :)
        IHubContext hubContext = 
                 GlobalHost.ConnectionManager.GetHubContext<TestHub>();
        hubContext.Clients.All.NotifyAdmin_Signup();
        Console.ReadLine();
    }
}

尝试在启动集线器连接之前注册事件。

     var hubConnection = new HubConnection("http://localhost:8080/");
     IHubProxy _hub = hubConnection.CreateHubProxy("TestHub");
     //Call a local method when the Server sends a signal 
     _hub.On("NotifyStation_Signup", x => PrintAccountCount());
     hubConnection.Start().Wait();
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