Question

我想从服务器向客户端发送通知。我已经尝试了聊天教程 found here，但这只是将聊天消息从一个客户端发送到客户端

我想要的是一个按钮，其onClick方法在服务器上运行。有一次，我单击此按钮，必须将通知（字符串消息）发送给所有客户端。

我的Hub类是

 public class NotificationsHub : Hub
{
    public void SendNotification(string author, string message)
    {
        Clients.All.broadcastNotification(author, message);
    }
}

并点击按钮，我试试这个

var context = GlobalHost.ConnectionManager.GetHubContext<NotificationsHub>();
context.Clients.All.SendNotification("Admin", "stop the chat");

但是，我还是无法通知客户。什么都没发生。我究竟做错了什么？？

我在客户端网页上的JS通知就像这样

 <script type="text/javascript">
    $(function () {


        // Declare a proxy to reference the hub. 
        var notifications = $.connection.notificationsHub;
        // Create a function that the hub can call to broadcast messages.
        notifications.client.broadcastNotification = function (name, message) {
            alert(name + " says '" + message + "'");

        };

Answer 1

您需要在按钮点击功能中调用broadcastNotification，如下所示：

var context = GlobalHost.ConnectionManager.GetHubContext<NotificationsHub>();
context.Clients.All.broadcastNotification("Admin", "stop the chat");

此外，您需要通过添加$.connection.hub.start()启动集线器，您的JS文件应该像：

<script src="~/Scripts/jquery-1.10.2.js"></script>
<script src="~/Scripts/jquery.signalR-2.0.1.js"></script>
<script src="/signalr/hubs"></script>

 <script type="text/javascript">   
  $(function () {
       var notifications = $.connection.notificationsHub;
        notifications.client.broadcastNotification = function (name, message) {
            alert(name + " says '" + message + "'");
        $.connection.hub.start();
   };
</script>

从服务器到客户端的SignalR通知

1 个答案: