如何获取signalR客户端的连接ID在服务器端？ [英] How to obtain connection ID of signalR client on the server side?

问题描述

我需要一个客户端的连接ID。我知道你可以从客户端使用 $。connection.hub.id 得到它。我需要的是要得到，而在web服务我有更新的记录在数据库中，又在网页上显示更新。我是新来signalR和计算器，所以任何的建议是AP preciated。在我的客户端的网页我有这样的：

I need to get the connection ID of a client. I know you can get it from the client side using $.connection.hub.id. What I need is to get in while in a web service I have which updates records in a database, in turn displaying the update on a web page. I am new to signalR and stackoverflow, so any advice would be appreciated. On my client web page I have this:

<script type="text/javascript">
    $(function () {
        // Declare a proxy to reference the hub. 
        var notify = $.connection.notificationHub;

        // Create a function that the hub can call to broadcast messages.
        notify.client.broadcastMessage = function (message) {
            var encodedMsg = $('<div />').text(message).html();// Html encode display message.
            $('#notificationMessageDisplay').append(encodedMsg);// Add the message to the page.
        };//end broadcastMessage

        // Start the connection.
        $.connection.hub.start().done(function () {
            $('#btnUpdate').click(function () {
                //call showNotification method on hub
                notify.server.showNotification($.connection.hub.id, "TEST status");
            });
        });


    });//End Main function


</script>

直到我想更新使用signalR页面一切正常了。在我的枢纽节目通知功能是这样的：

everything works up until I want to update the page using signalR. The show notification function in my hub is this:

//hub function
public void showNotification(string connectionId, string newStatus){               
    IHubContext context = GlobalHost.ConnectionManager.GetHubContext<notificationHub>();
    string connection = "Your connection ID is : " + connectionId;//display for testing
    string statusUpdate = "The current status of your request is: " + newStatus;//to be displayed
    //for testing, you can display the connectionId in the broadcast message
    context.Clients.Client(connectionId).broadcastMessage(connection + " " + statusUpdate);
}//end show notification

我怎么能对的ConnectionId发送到我的web服务？

how can I send the connectionid to my web service?

我希望我没有试图做一些事情是不可能的。先谢谢了。

Hopefully I'm not trying to do something impossible. Thanks in advance.

推荐答案

在客户端调用服务器端功能，您可以通过 Context.ConnectionId 检索其连接ID 。现在，如果你想通过一种机制来访问连接ID外的枢纽，你可以：

When a client invokes a function on the server side you can retrieve their connection ID via Context.ConnectionId. Now, if you'd like to access that connection Id via a mechanism outside of a hub, you could:

1. 只是有集线器调用您传递的连接ID外部方法。


2. 管理连接的客户端列表又名像公共静态ConcurrentDictionary＆LT;字符串，MyUserType＆GT; ... 通过添加到字典 OnConnected ，并从它在 OnDisconnected 。一旦你有你的用户列表，你可以然后通过外部机构查询。



1. Just have the Hub invoke your external method passing in the connection id.
2. Manage a list of connected clients aka like public static ConcurrentDictionary<string, MyUserType>... by adding to the dictionary in OnConnected and removing from it in OnDisconnected. Once you have your list of users you can then query it via your external mechanism.

例1：

public class MyHub : Hub
{
    public void AHubMethod(string message)
    {

        MyExternalSingleton.InvokeAMethod(Context.ConnectionId); // Send the current clients connection id to your external service
    }
}

出2：

public class MyHub : Hub
{
    public static ConcurrentDictionary<string, MyUserType> MyUsers = new ConcurrentDictionary<string, MyUserType>();

    public override Task OnConnected()
    {
        MyUsers.TryAdd(Context.ConnectionId, new MyUserType() { ConnectionId = Context.ConnectionId });
        return base.OnConnected();
    }

    public override Task OnDisconnected()
    {
        MyUserType garbage;

        MyUsers.TryRemove(Context.ConnectionId, out garbage);

        return base.OnDisconnected();
    }

    public void PushData(){
        //Values is copy-on-read but Clients.Clients expects IList, hence ToList()
        Clients.Clients(MyUsers.Keys.ToList()).ClientBoundEvent(data);
    }
}

public class MyUserType
{
    public string ConnectionId { get; set; }
    // Can have whatever you want here
}

// Your external procedure then has access to all users via MyHub.MyUsers

希望这有助于！

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