如何从 C# 客户端连接到 SignalR 集线器

Question

我有一个Console Application，我正在尝试订阅一个SignalR 集线器。 查看互联网上的所有示例，我看到所有人都使用HubConnection 来做到这一点。 问题是我认为它们都已被弃用，因为在他们的情况下constructor 需要url，而在文档中需要IConnectionFactory 和ILoggerFactory。

服务器

public class Startup {

        public void ConfigureServices(IServiceCollection services) {
            services.AddCors(o =>
            o.AddPolicy("CorsPolicty", b => b.WithOrigins("http://localhost:4200").AllowAnyHeader().AllowAnyMethod().AllowCredentials());
            services.AddSignalR();
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env) {
            app.UseDeveloperExceptionPage();
            app.UseSignalR(r => r.MapHub<MyHub>("/myhub"));
        }
    }


public class MyHub:Hub {
        public async Task SendMessage(string user,string message) {

            await this.Clients.All.SendAsync("ReceiveMessage", user, message);

        }
    }

客户

所以HubConnection 看起来不像MSDN 示例中的那样，我也看过HubConnectionBuilder 类，在所有示例中都有WithUrl 扩展名，而实际上它有一个IServiceCollection可以添加服务。

class ConcreteContext : ConnectionContext {
        public override string ConnectionId { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }

        public override IFeatureCollection Features => throw new NotImplementedException();

        public override IDictionary<object, object> Items { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
        public override IDuplexPipe Transport { get => throw new NotImplementedException(); set => throw new NotImplementedException(); }
    }
    class Factory : IConnectionFactory {
        public Task<ConnectionContext> ConnectAsync(TransferFormat transferFormat, CancellationToken cancellationToken = default(CancellationToken)) {
            var context = new ConcreteContext();
            return Task.FromResult(context as ConnectionContext);
        }

        public Task DisposeAsync(ConnectionContext connection) {
            throw new NotImplementedException();
        }
    }
    class Program {
        static void Main(string[] args) {
            //try 1
            var builder = new HubConnectionBuilder().Build(); //no withUrl extensions
            //try 2
            var factory = new Factory();
            var hub = new HubConnection(factory,); //needs IConnectionFactory and IHubProtocol and ILoggerFactory

        }

我不敢相信我必须实现所有膨胀才能开始连接。如何连接到集线器？ 如果我不得不为一件事写这么多，我可能会考虑回到原始websockets。

Answer 1

这个SO 问题似乎已解决，但包含从客户端到 SignalR Core 集线器的连接的链接和参考。

客户端代码看起来比您显示的要简单得多。如果需要，我会检查一下和链接。