signalr group add

问题

can i add e.g. username instead of connection.id. does it work? i'm asking this because over ConnectionId i can't send notification to the user, because ConnectionId always is changes?

Groups.Add("my_username", "mygroup1);

回答1:

No you cannot, you must use a ConnectionID. You can however do the following.

On your hub store a list of users mapped to connection IDs:

static ConcurrentDictionary<string, User> _users = new ConcurrentDictionary<string, User>();

Then after a client connection has been started you can call into a method like:

myHub.server.createUser("MyUsername");

Of course on the server you'd have:

public void createUser(string userName) 
{
    // You'd create a User class that had both of the following properties
    var user = new User
    {
        UserName = userName,
        ConnectionID = Context.ConnectionId
    };
    _users.TryAdd(user.ConnectionID, user);        
}

SO whenever you want to lookup a user via connection ID you still have context of his/her username via the _users dictionary.

Note: This code works via signalr 1.0 alpha +

来源：https://stackoverflow.com/questions/13850055/signalr-group-add