Aspnetcore: SignalR .NetCore 3.0-- HubConnectionBuilder' does not contain a definition for 'WithUrl'

[Grey007]

Describe the bug

A clear and concise description of what the bug is.
Hi,
I'm trying to create a HubConnection on a Console App, but getting an error with .WithUrl.

Receiving the following error:

HubConnectionBuilder' does not contain a definition for 'WithUrl' and no accessible extension method 'WithUrl' accepting a first argument of type 'HubConnectionBuilder' could be found

My code:

using Microsoft.AspNetCore.SignalR.Client;

    class Program

    {

        public static async Task Main(string[] args)

        {

            var connection =  new HubConnectionBuilder()

           .WithUrl("https://localhost:44386/NotificationHub")

           .Build();

            await connection.StartAsync();
            while (true)
            {
                try
                {
                    await connection.StartAsync();

                    break;
                }
                catch
                {
                    await Task.Delay(1000);
                }
            }

            Console.WriteLine("Client One listening. Hit Ctrl-C to quit.");
            Console.ReadLine();
        }
    }
}

[BrennanConroy]

What does your .csproj look like?

I'm guessing you referenced Microsoft.AspNetCore.SignalR.Client.Core instead of Microsoft.AspNetCore.SignalR.Client in your .csproj. Change the reference and you'll see the WithUrl method.

[Grey007]

Yeah, looks like that was the issue. Just a comment, I followed a prompt from VS19 suggesting I install that Microsoft.AspNetCore.SignalR.Client.Core.

Thanks for the help!

[BrennanConroy]

Was this prompt a ctrl-. on HubConnectionBuilder in the editor?

[Grey007]

Yeah,

[anurse]

Unfortunately the HubConnectionBuilder type is in that package (Client.Core), but the WithUrl extension method is in Client. There isn't really a way to tell VS to suggest a different package (though that could be an interesting idea for the future).

Ctrl-. on the WithUrl method itself might have offered the right package.

Out of curiocity, did you look at a doc or tutorial before starting? Most of our docs should be referring to the correct package, but if you followed a different reference (or even if you followed one of our docs and missed the package ID) that's useful information for us in helping others avoid confusion :)

[davehutton]

I got confused by which version I needed to install. Not sure if that would catch anyone else
http://assets.gocreative1.net/wp-content/uploads/sites/38/2019/11/signalrVersionConfused.jpg