How to get a .Net Framework SignalR client to connect to .Net Core SignalR Server?

Question

SignalR Server:

IIS ASP.Net Core 8.0,

Microsoft.AspNetCore.SignalR 1.1.0,

Microsoft.AspNetCore.SignalR.Core 1.1.0,

Angular,

Javascript (Browser) successfully made SignalR connection

SignalR Client 1:

IIS ASP.NET 4.8,

Microsoft.AspNetCore.SignalR.Client 8.0.0.0,

Microsoft.AspNetCore.SignalR.Client.Core 8.0.0.0,

successfully made SignalR connection

SignalR Client 2:

Windows C# Desktop UI App .NET Framework 4.8,

Microsoft.AspNetCore.SignalR.Client 8.0.0.0,

Microsoft.AspNetCore.SignalR.Client.Core 8.0.0.0,

Failed to make SignalR connection.

Connection = new HubConnectionBuilder()

.WithUrl("http://localhost/QMOSRFactor/rfactor",

    options => {

        options.Transports = HttpTransportType.WebSockets;

    })

.WithAutomaticReconnect()

.Build();

await Connection.StartAsync();

For SignalR Client 2, after calling await Connection.StartAsync(), nothing happened. No error in Visual Studio Output. No exceptions throwed.

If I wrapped the above code in netstandard2.0 library. Reference this library in Client 2 project. Nothing happened. No error in Visual Studio Output. No exceptions.

Answer 1

Hi @Net Wang,
I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to accept the answer.

Solution:
Solved the issue by embedding in Task.Factory.StartNew. It seems that it should use a new thread different from Windows Form UI thread.

Task.Factory.StartNew(() => {
           Connection = new HubConnectionBuilder()
              .WithUrl("http://localhost/QMOSRFactor/rfactor", options => {
                  options.Transports = HttpTransportType.WebSockets;
              })
             .ConfigureLogging(logging => {
                  logging.SetMinimumLevel(LogLevel.Trace);
                  logging.AddConsole();
             })
             .WithAutomaticReconnect()
             .Build();
       });

If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

Answer 2

Solved the issue by embedding in Task.Factory.StartNew. It seems that it should use a new thread different from Windows Form UI thread.

       Task.Factory.StartNew(() => {
           Connection = new HubConnectionBuilder()
              .WithUrl("http://localhost/QMOSRFactor/rfactor", options => {
                  options.Transports = HttpTransportType.WebSockets;
              })
             .ConfigureLogging(logging => {
                  logging.SetMinimumLevel(LogLevel.Trace);
                  logging.AddConsole();
             })
             .WithAutomaticReconnect()
             .Build();
       });