SignalR 2.2 application encountering communication issues with client message reception

Question

SignalR 2.2 application encountering communication issues with client message reception

I am facing an issue in my application where clients are not receiving messages from the Hub when a user signs in.

Here is my Hub class:

    public class GameHub : Hub
    {
        public async Task UserLoggedIn(string userName)
        {
            await Clients.All.SendAsync("UserLoggedIn", userName);
        }
    }

The UserLoggedIn method on GameHub gets called when a user logs in as I have set a breakpoint and verified it.

On the client page, I have:

        const connection = new signalR.HubConnectionBuilder()
            .withUrl("/gameHub")
            .configureLogging(signalR.LogLevel.Information)
            .build();

        connection.start().then(() => {
            console.log("connected");
        });

        connection.on("UserLoggedIn", (userName) => {
            console.log("User Logged In" + userName);
        });

Even though the console window in another incognito browser shows "connected," I do not see "User Logged In" after the UserLoggedIn method is invoked on GameHub.

Could someone help me identify what could be causing this issue?

javascript c#typescript asp.net-core signalr

Answer 1

Answer №1

If you are not receiving messages in an incognito browser, it could be because you are only listening on SignalR and not invoking it. To resolve this issue, you can update your code as shown below:

public class GameHub : Hub
{
    public async Task UserLoggedIn(string userName)
    {
        await Clients.All.SendAsync("SendUserLoggedInMessage", userName);
    }
}

Next, in your JavaScript code:

<script>
    const connection = new signalR.HubConnectionBuilder()
        .withUrl("/gameHub")
        .configureLogging(signalR.LogLevel.Information)
        .build();

    connection.start().then(() => {
        console.log("connected");
    });

    // Listen for SendUserLoggedInMessage
    connection.on("SendUserLoggedInMessage", (userName) => {
        console.log("User Logged In: " + userName);
    });

    // Invoke the UserLoggedIn method
   connection.send("userLoggedIn", username)
              .then(() => console.log("something"));

</script>

Answer 2

If you are not receiving messages in an incognito browser, it could be because you are only listening on SignalR and not invoking it. To resolve this issue, you can update your code as shown below:

public class GameHub : Hub
{
    public async Task UserLoggedIn(string userName)
    {
        await Clients.All.SendAsync("SendUserLoggedInMessage", userName);
    }
}

Next, in your JavaScript code:

<script>
    const connection = new signalR.HubConnectionBuilder()
        .withUrl("/gameHub")
        .configureLogging(signalR.LogLevel.Information)
        .build();

    connection.start().then(() => {
        console.log("connected");
    });

    // Listen for SendUserLoggedInMessage
    connection.on("SendUserLoggedInMessage", (userName) => {
        console.log("User Logged In: " + userName);
    });

    // Invoke the UserLoggedIn method
   connection.send("userLoggedIn", username)
              .then(() => console.log("something"));

</script>

SignalR 2.2 application encountering communication issues with client message reception

Answer №1

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