C# 如何使用 SignalR 加入群组
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How to join a group using SignalR
提问by user516883
I am new to using SignalR (started today), Pretty simple to send a message to ALL clients connected, but now I want to just send to a group. I cannot find simple documentation on how to join on the client side. If anyone can help, how can I SIMPLY join a group on the javascript side. Thanks for any help.
我是使用 SignalR 的新手（从今天开始），向所有连接的客户端发送消息非常简单，但现在我只想发送给一个组。我找不到有关如何在客户端加入的简单文档。如果有人可以提供帮助，我怎么能简单地加入 javascript 方面的一个组。谢谢你的帮助。
public class EventHub : Hub
{
public void SendNewMedia(MediaInfoViewModel model,Guid eventId)
{
Clients.Group(eventId.ToString()).setupmedia(model);
}
}
//Controller that is sending client new data
var eventHub = GlobalHost.ConnectionManager.GetHubContext<EventHub>();
var result = eventHub.Clients.Group(eventId.ToString()).setupmedia(eventViewer);
//Finally the javascript. Not sure how to setup just for a group
$(function () {
var event = $.connection.eventHub;
event.client.setupmedia = function (newMedia) {
$('#photolist').prepend('<li><img src="' + newMedia.MediaUrl + '" class="img-polaroid span2"/></li>');
};
$.connection.hub.start(function() {
event.server.create(eventID);//I know this is wrong but not sure how to connect
}).done(function () {
alert('conntected. Ready to retrieve data!');
});
});
采纳答案by Nikola Dimitroff
You can't. If you could join a group from javascript then anyone may use your code to join any group which breaks security. If you really need to do that - create a method on the server side that takes a group name as parameter and adds the client to the group.
你不能。如果您可以从 javascript 加入一个组，那么任何人都可以使用您的代码加入任何破坏安全性的组。如果您确实需要这样做 - 在服务器端创建一个方法，该方法将组名作为参数并将客户端添加到组中。
public void JoinGroup(string groupName)
{
this.Groups.Add(this.Context.ConnectionId, groupName);
}
Afterwards, call it from JS like that
之后，像这样从JS调用它
eventHub.server.joinGroup("my-awsm-group");
回答by JCisar
Just in case you come across this question now (like I did), here is an example for how to implement an azure function to support groups.
以防万一你现在遇到这个问题（就像我做的那样），这里有一个例子，说明如何实现一个 azure 函数来支持组。
