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How to join / leave a group in SignalR?


How to join / leave a group in SignalR?

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How to join / leave a group in SignalR?
Tag : chash , By : jazzyfox
Date : November 26 2020, 12:01 PM

Hope this helps When to remove a connection from a group depends on your specific scenario. For example, you may want to remove the connection from a group when the user navigates away from a page, etc.
But group membership does not persist across different connections. This means you don't need to manually leave groups when you disconnect a SignalR connection. When you disconnect (whether intentional or due to an error), all memberships in groups will be lost. Quoting Microsoft Docs:

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How to join a group using SignalR


Tag : chash , By : alchemist
Date : March 29 2020, 07:55 AM
it helps some times 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.
public void JoinGroup(string groupName)
{
    this.Groups.Add(this.Context.ConnectionId, groupName);
}
eventHub.server.joinGroup("my-awsm-group");

SignalR join/leave group doesn't work correctly


Tag : javascript , By : James Dio
Date : November 23 2020, 12:01 PM
Hope that helps The group management methods (add and remove) are async. If you don't await the returned task then send to the group immediately after you have a race condition such that the client you just added might not receive the message. Also, you should never call .Wait() from in a hub method. Make the hub method async and await it instead.
readonly ISprayBroadcaster _sprayBroadcaster;
readonly IWorkRecordRepository _workRecordRepository;

public SprayHub(ISprayBroadcaster sprayBroadcaster, IWorkRecordRepository workRecordRepository)
{
    _sprayBroadcaster = sprayBroadcaster;
    _workRecordRepository = workRecordRepository;
}

public async Task Broadcast(string name)
{
    await Process.DataProcess(_workRecordRepository, Clients, name);
}

public async Task SwapGroup(string previousGroup, string newGroup)
{
    await Groups.Remove(Context.ConnectionId, previousGroup);
    await Groups.Add(Context.ConnectionId, newGroup);
}

public async Task JoinGroup(string groupName)
{
    await Groups.Add(Context.ConnectionId, groupName);
}

How to join a client to group in MVC using signalR


Tag : javascript , By : meehan
Date : March 29 2020, 07:55 AM
Does that help I found the problem. my javascript had(I just also noticed the javascript I wrote here was a previous version):
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
var hub = $.Connection.gamesHub;

How to join group using SignalR Objective-C?


Tag : ios , By : 小和尚
Date : March 29 2020, 07:55 AM
To fix the issue you can do Joining to a group is a server side thing. You need to create a hub method (server side) that adds a connection to a group and then invoke this hub method from the client. Take a look at this article for more details.

Join group on the js - SignalR 1.1.4


Tag : reactjs , By : Sharad
Date : March 29 2020, 07:55 AM
hope this fix your issue I was able to achieve what I wanted by following this tutorial
in short:
    public async Task JoinGroup(string group)
    {
        if (connectionsNgroup.ContainsKey(Context.ConnectionId))
        {
            await Groups.RemoveFromGroupAsync(Context.ConnectionId, connectionsNgroup[Context.ConnectionId]);
            connectionsNgroup.Remove(Context.ConnectionId);
        }
        connectionsNgroup.Add(Context.ConnectionId, group);
        await Groups.AddToGroupAsync(Context.ConnectionId, group);
    }
this.state.hubConnection.invoke("JoinGroup", this.state.groupName).catch(err => console.error(err));
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