CODEWITHSUNDEEP
c#asp.netsignalr
Mohamed Navas
Mohamed Navas

Reputation: 612

SignalR Page Refresh Makes Multiple Connection

I want to show some live random data on client using SignalR.

Problem Is whenever I refresh the page it creates one more connection and shows multiple data.

Mostly I think my approach is wrong.

So what I have done.

Step 1: Installed SignalR Using Nuget Install-Package Microsoft.AspNet.SignalR

Step 2: Made changes in Startup.cs File as follows.

public partial class Startup
{
    public void Configuration(IAppBuilder app)
    {
        ConfigureAuth(app);
        app.MapSignalR(); //Added this line for SignalR
    }
}

Step 3: Created Hub Class. "ServerStatisticsHub.cs"

public class ServerStatisticsHub : Hub
{
    public void ServerParameter()
    {
        Random r = new Random();
        int p = 0;
        int m = 0;
        int s = 0;

        while(true) //May be this is the foolish thing I'm doing
        {
            p = r.Next(0, 100);
            m = r.Next(0, 100);
            s = r.Next(0, 100);
            Clients.All.broadcastServerStatistics("{\"processor\":" + p + ", \"memory\":" + m + ", \"storage\":" + s + "}");
            System.Threading.Thread.Sleep(2000);
        }
    }
}

Step 4: Created an View in Home "ServerState.cshtml".

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" name="viewport">
    <title>TestSignalR</title>
</head>
<body>
    <div id="serverProcessor"></div>
    <div id="serverMemory"></div>
    <div id="serverStorage"></div>

    <script src="@Url.Content("~/Scripts/jquery-2.2.3.min.js")"></script>    
    <script src="@Url.Content("~/Scripts/jquery.signalR-2.2.1.min.js")"></script>
    <script src="@Url.Content("~/signalr/hubs")"></script>
    <script>
        $(function () {
            // Reference the auto-generated proxy for the hub.
            var serverStatistics = $.connection.serverStatisticsHub;

            // Create a function that the hub can call back to display messages.
            serverStatistics.client.broadcastServerStatistics = function (serverStat) {
                var serverStatistic = JSON.parse(serverStat);
                console.log(serverStatistic);

                $('#serverProcessor').html(serverStatistic.processor + "%");
                $('#serverMemory').html(serverStatistic.memory + "%");
                $('#serverStorage').html(serverStatistic.storage + "%");
            };

            // Start the connection.
            $.connection.hub.start().done(function () {
                serverStatistics.server.serverParameter();
            });
        });

    </script>
</body>
</html>

Upvotes: 6

Views: 2027

Answers (1)

Mohamed Navas
Mohamed Navas

Reputation: 612

I found a workaround to fix this issue. I don't know how to describe it.

The following code change done in Hub Class file. "ServerStatisticsHub.cs"

Clients.Client(Context.ConnectionId).broadcastServerStatistics("{\"processor\":" + p + ", \"memory\":" + m + ", \"storage\":" + s + "}");

Changed

Clients.All.

to

Clients.Client(Context.ConnectionId).

Upvotes: 2

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