ASP.NET 5 - app.UseSignalR - error

Question

User-953595010 posted

Hello,

I'm trying out SignalR based on the book "SignalR Programming in Microsoft ASP.NET". I'm running ASP.NET 5 with 1.0.0.-rc1-update1. I already there are some changes: eg I suppose app.MapSignalR is replaced by UseSignalR?

This is my project.json

{
  "version": "1.0.0-*",
  "compilationOptions": {
    "emitEntryPoint": true
  },

  "dependencies": {
    "Microsoft.AspNet.IISPlatformHandler": "1.0.0-rc1-final",
    "Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final",
    "Microsoft.AspNet.SignalR.Server": "3.0.0-rc1-final"
  },

  "commands": {
    "web": "Microsoft.AspNet.Server.Kestrel"
  },

  "frameworks": {
    "dnx451": { },
    "dnxcore50": { }
  },

  "exclude": [
    "wwwroot",
    "node_modules"
  ],
  "publishExclude": [
    "**.user",
    "**.vspscc"
  ]
}

I have the following code in Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNet.Builder;
using Microsoft.AspNet.Hosting;
using Microsoft.AspNet.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.AspNet.SignalR;

namespace SignalRTest
{
    public class Startup
    {
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app)
        {
            app.UseIISPlatformHandler();

            app.UseSignalR<EchoConnection>("/echo");


            app.Run(async (context) =>
            {
                await context.Response.WriteAsync("Hello World!");
            });
        }

        // Entry point for the application.
        public static void Main(string[] args) => WebApplication.Run<Startup>(args);
    }
}

everything builds fine but when running my project I get:

An exception of type 'System.InvalidOperationException' occurred in Microsoft.AspNet.Http.Abstractions.dll but was not handled in user code

Additional information: Unable to resolve service for type 'Microsoft.Extensions.OptionsModel.IOptions`1

"app.UseSignalR<EchoConnection>("/echo"); is the cause of this runtime error."

Anyone can help me to resolve this?

Thanks.
Guy

Answer 1

User61956409 posted

Hi gdillen,

Firstly, please try to use the following code to add SignalR to the pipeline.

app.UseSignalR();

Besides, please refer to the following links that explained how to use SignalR in ASP.NET 5.

http://dotnetthoughts.net/using-signalr-in-asp-net-5/

https://code.msdn.microsoft.com/The-ASPNET-vNext-Real-Time-b1d27fe4

Best Regards,

Fei Han

Answer 2

User-2046572174 posted
looks like the dependency injection is complaining because you didnt setup the services for signalr. try adding: services.AddSignalr(); to your configureservices method.