Can't connect to blazor server from console app

[intech-paul]

I have blazor sample working, and can start chats etc, but I am wanting to connect a console app to the same chat hub on the same pc, but cannot.

Here is the sample code
` private static void Main(string[] args)
{
Console.WriteLine("Starting App...");

        //Set connection
        //var connection = new HubConnection("http://127.0.0.1:6836/");
        var connection = new HubConnection("http://localhost:6836");
        //Make proxy to hub based on hub name on server
        var myHub = connection.CreateHubProxy("/ChatHub");
        //Start connection

        Console.WriteLine("Starting Connection");

        for (int i = 0; i < 5; i++)
        {
            Console.WriteLine("Sleeping...");
            Thread.Sleep(1000);
        }

        myHub.On<string>("addMessage", param => {
            Console.WriteLine(param);
        });

        connection.Start().ContinueWith(task => {
            if (task.IsFaulted)
            {
                Console.WriteLine("There was an error opening the connection:{0}",
                                  task.Exception.GetBaseException());
            }
            else
            {
                Console.WriteLine("Connected");
            }

        }).Wait();
        

        for (int i = 0; i < 5;i++)
            {
            Console.WriteLine("Sleeping...");
            Thread.Sleep(1000);
            }        

        myHub.Invoke<string>("Send", "HELLO World ").ContinueWith(task => {
            if (task.IsFaulted)
            {
                Console.WriteLine("There was an error calling send: {0}",
                                  task.Exception.GetBaseException());
            }
            else
            {
                Console.WriteLine(task.Result);
            }
        });

`

The error is
There was an error opening the connection:Newtonsoft.Json.JsonReaderException: Unexpected character encountered while parsing value: ?. Path '', line 0, position 0.
at Newtonsoft.Json.JsonTextReader.ParseValue()
at Newtonsoft.Json.JsonTextReader.ReadInternal()
at Newtonsoft.Json.JsonTextReader.Read()
at Newtonsoft.Json.Linq.JObject.Load(JsonReader reader)
at Newtonsoft.Json.Linq.JObject.Parse(String json)
at Microsoft.AspNet.SignalR.Client.Transports.TransportHelper.<>c.b__0_1(String raw) in //src/Microsoft.AspNet.SignalR.Client/Transports/TransportHelper.cs:line 43
at Microsoft.AspNet.SignalR.TaskAsyncHelper.<>c__DisplayClass31_02.<Then>b__0(Task1 t) in //src/Microsoft.AspNet.SignalR.Core/TaskAsyncHelper.cs:line 494
at Microsoft.AspNet.SignalR.TaskAsyncHelper.TaskRunners2.<>c__DisplayClass3_0.<RunTask>b__0(Task1 t) in /_/src/Microsoft.AspNet.SignalR.Core/TaskAsyncHelper.cs:line 1280

Any clues as to what I am doing wrong ?

[conficient]

OK, first I'd suggest using an async Task Main() so that your code can use async/await - this simplifies using async code a lot.

Secondly I think the version of the client might be out of date, I tried copying your code but the methods didn't match the ones in the current SignalR client.

However the simplest answer is that the Shared project's ChatClient is almost a re-usable client for any type of client. It used to require the NavigationManger in the constructor to create the URL, but by changing this to just a string means the console app can also use this.

I created a sample application in this branch: https://github.com/conficient/BlazorChatSample/tree/console-app-sample

If you set both the console and the web as the startup projects you can cross-communicate between console and browser.