向除SignalR中自身以外的所有客户端广播消息 [英] Broadcasting message to all clients except self in SignalR

问题描述

我意识到这些问题很相似：

I realize that these questions are similar:

SignalR-广播给除呼叫者以外的所有客户端

向组中的所有客户端（当前客户端除外）发送消息

但是，它们太旧了，在当前文档中，没有任何关于我是否在做正确的事情的线索。

However, they are old and nothing in the current documentation gave me any clues as to whether I am doing the right thing or not.

这里是问题/问题：

我需要能够从服务器端广播消息除了提交http请求的那个人以外的所有连接的客户-假设有人提交了一个表单，并使所有连接到同一表单的人都被告知已经提交了某些内容。

I need to be able to broadcast a message from the server-side to all connected clients except the guy that submitted the http request - imagine someone submitting a form and getting all people connected to the same form being notified that something has been submitted.

我现在这样做的方式是这样的：

The way I am doing that now is something like this:

var context = GlobalHost.ConnectionManager.GetHubContext<MyHub>();
var connectionID = HttpContext.Request.Cookies["conn-id"].Value;
context.Clients.AllExcept(connectionID).addMessage(message);

每次建立连接时，我都会在客户端的cookie中设置ConnectionID：

And every time a connection is established, I set ConnectionID in a cookie on the client side as so:

$.connection.hub.start().done(function(){ 
      $.cookie("conn-id",$.connection.hub.id); 
});

所以我的问题是：

1. 在这种情况下，这是最好/唯一的方法吗？我可以从 hub.Context.ConnectionID 之类的其他地方读取发起请求的客户端的连接ID还是类似于获取 SessionID 来自HttpContext.Current.Session.SessionID？

1. Is this the best/only approach I can take in this case? Can I read the connection id of the client that originated the request from somewhere else like hub.Context.ConnectionID or something similar to the way you would get the SessionID from HttpContext.Current.Session.SessionID?

例如，当客户端通过将其设置为SessionID进行连接时，可以通过编程方式设置连接ID吗？出于某种原因会引起问题吗？如果是这样，您能解释一下如何以编程方式设置连接ID以及我需要为此挂接哪个事件吗？

Can I set the connection id programmatically when a client connects by setting it to the SessionID, for example? Could that cause a problem for some reason? If so, can you please explain how to set the connection ID programmatically and to which event do I need to hook up in order to do this?

我注意到每次重新加载页面时，连接ID都会更改为其他GUID。您如何只设置一次ConnectionId，并至少在Session的整个生命周期内维护它？

I noticed that everytime the page is reloaded, the connection id is changed to a different guid. How do you set the ConnectionId only once and maintain it at least for the life of the Session?

推荐答案

您的方法确实有效，但是正确的方法是使用内置的API： Clients.Others.addMessage（message）。同样，也无需将中心上下文放入中心本身。您始终可以通过Context.ConnectionId访问当前的连接ID，也可以通过Clients.All.foo（）;向客户端发送消息。

Your approach does work, however the correct approach is to use the built in API: Clients.Others.addMessage(message). Also there's no need to get the hub context inside the hub itself. You can always access the current connection ID via Context.ConnectionId or send message sto clients via Clients.All.foo();

并且您不能以编程方式设置ConnectinoID。如果您想跨页面跟踪用户，请在服务器上维护一个用户列表，然后在他们浏览网站时重新分配连接ID。

And you cannot set the ConnectinoID programatically. If you'd like to track users across pages maintain a list of users on your server and then just re-assign the connection id's as they navigate through the site.

此处是解释用户跟踪的帖子： SignalR 1.0 beta连接工厂

Here's a post explaining the tracking of users: SignalR 1.0 beta connection factory

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