'SignalR Client How to Set user when start connection?

Server side:

public override Task OnConnected()
{
    var connectionId = Context.ConnectionId;
    var user = Context.User.Identity.Name; // Context.User is NULL
    return base.OnConnected();
}

Client side (in Console project):

IHubProxy _hub;
string url = @"http://localhost:8080/";
var connection = new HubConnection(url);
_hub = connection.CreateHubProxy("TestHub");
connection.Start().Wait();

When the client connect to the server, I want to know the map between userName and connectionId, But Context.User is NULL. How do I set this value in the client side?

javascriptc++sharpsignalrsignalr-hubsignalr.client


Solution 1:[1]

Pass your username using query string.

Client

First set query string

string url = @"http://localhost:8080/";
var connection = new HubConnection(url);
_hub = connection.CreateHubProxy("TestHub");
connection.qs = { 'username' : 'anik' };
connection.Start().Wait();

Server

public override Task OnConnected()
{
    var username= Context.QueryString['username'];
    return base.OnConnected();
}

Solution 2:[2]

try this with queryString in asp.netcore 2.1:

Client (javascript) set query string after url like follow:

var connection = new signalR.HubConnectionBuilder().withUrl("http://localhost:10499/chathub?username=xxxx").build();
connection.start().then(function ()
{
    // do some thing here ...
}).catch(function (err)
{
    console.error(err.toString());
});
.
.
.

Server

public override Task OnConnectedAsync()
    {
        var  username = Context.GetHttpContext().Request.Query["username"];
        // username = xxxx
        return base.OnConnectedAsync();
    }

Solution 3:[3]

Client

var connection = new HubConnection(<YOUR_URL>);
connection.Headers.Add("username", "maria");
var myHub = connection.CreateHubProxy("MyHub");

Server

string username = Context.Headers.Get("username");
Console.WriteLine("New client connection - " + username);

Solution 4:[4]

If your using basic authentication create a new System.Net.NetworkCredential

string url = @"http://localhost:8080/";
var connection = new HubConnection(url);

NetworkCredential myCredentials = new NetworkCredential("","","");
myCredentials.Domain = "domain";
myCredentials.UserName = "username";
myCredentials.Password = "passwd";   

connection.Credentials = myCredentials;

_hub = connection.CreateHubProxy("TestHub");


connection.Start().Wait();

See: https://docs.microsoft.com/en-us/dotnet/api/system.net.networkcredential.username?view=net-6.0

Solution 5:[5]

try this

Client (C#)

       //Enter query string 
       var querystringData = new Dictionary<string, string>();
       querystringData.Add("username", "naveed");


       IHubProxy _hub;
       string url = @"http://localhost:8080/";
       var connection = new HubConnection(url);
       _hub = connection.CreateHubProxy("TestHub");
       connection.Start().Wait();
       connection.Start().Wait();

Server

public override Task OnConnected()
{
  var connectionId = Context.ConnectionId;
  var username= Context.QueryString["username"]; //here you will receive naveed as username

  return base.OnConnected();
}

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Anik Islam Abhi
Solution 2 AminRostami
Solution 3 Jéssica Machado
Solution 4 Ryan Dooley
Solution 5 Naveed Ahmed

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