title: ReceiveMessage does not work with abp.signalR
body: <p>I'm using abp.signalR but I've encountered problem-related to ReceiveMessage event, I wanna know once the message is received I tried below code but nothing happened :\</p>
  
  <pre><code>this.chatHub.on("ReceiveMessage", (username: string, message: string) =&gt; { 
  
  
  });
  </code></pre>
  
  <p><strong>Web console screen shoot:</strong></p>
  
  <p><a href="https://i.stack.imgur.com/XAARS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XAARS.png" alt="enter image description here"></a></p>
  
  <p><strong>My back-end code:</strong>
  Do I need to add more code to the backend ?</p>
  
  <pre><code>
  namespace HealthMapControlPanel.ChatAppService
  {
     public class MyChatHub : Hub, ITransientDependency
      {
           public IAbpSession AbpSession { get; set; }
  
      public ILogger Logger { get; set; }
  
      public MyChatHub()
      {
          AbpSession = NullAbpSession.Instance;
          Logger = NullLogger.Instance;
      }
  
      public async Task SendMessage(string message)
      {
          await Clients.All.SendAsync("getMessage", string.Format("User {0}: {1}", AbpSession.UserId, "the message that has been sent from client is"+message));
      }
          public async Task SendToUser(string msg, long userId)
          {
              if (this.Clients != null)
              {
                  await Clients.User(userId.ToString()).SendAsync("Send", msg, "From Server by userID ", Context.ConnectionId, Clock.Now);
              }
              else
              {
                  throw new UserFriendlyException("something wrong");
              }
          }
  
  
          public override async Task OnConnectedAsync()
      {
          await base.OnConnectedAsync();
          Logger.Debug("A client connected to MyChatHub: " + Context.ConnectionId);
      }
  
      public override async Task OnDisconnectedAsync(Exception exception)
      {
          await base.OnDisconnectedAsync(exception);
          Logger.Debug("A client disconnected from MyChatHub: " + Context.ConnectionId);
      }
  
  
      }
  
  
  }
  
  </code></pre>