下面的例子我在服务器端调用，但客户端不接收，有时它工作，但有时它不工作（更多的不工作比它的工作）
这应该是非常简单的，但它不是，任何建议将帮助我这么多！

服务器端

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddControllers().AddNewtonsoftJson(options =>
        {
            options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
        });

        var connection = @"data source=comandai.database.windows.net;initial catalog=HojeTaPago;persist security info=True;user id=Comandai;password=Ck@21112009;MultipleActiveResultSets=True;";
        services.AddDbContext<ComandaiContext>(options => options.UseSqlServer(connection));

        services.AddSignalR(options => options.KeepAliveInterval = TimeSpan.FromSeconds(5));

        services.Configure<CookiePolicyOptions>(options =>
        {
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddResponseCompression(opts =>
        {
            opts.MimeTypes = ResponseCompressionDefaults.MimeTypes.Concat(
                new[] { "application/octet-stream" });
        });

        services.AddSwaggerGen(c =>
        {
            c.SwaggerDoc("v1", new OpenApiInfo { Title = "HojeTaPago API", Version = "v1" });
            c.AddSecurityDefinition("basic", new OpenApiSecurityScheme
            {
                Name = "Authorization",
                Type = SecuritySchemeType.Http,
                Scheme = "basic",
                In = ParameterLocation.Header,
                Description = "Basic Authorization header using the Bearer scheme."
            });

            c.AddSecurityRequirement(new OpenApiSecurityRequirement
            {
                {
                      new OpenApiSecurityScheme
                        {
                            Reference = new OpenApiReference
                            {
                                Type = ReferenceType.SecurityScheme,
                                Id = "basic"
                            }
                        },
                        new string[] {}
                }
            });
        });

        services.AddCors(options => options.AddPolicy("CorsPolicy",
        builder =>
        {
            builder.AllowAnyMethod().AllowAnyHeader()
                   .AllowCredentials();
        }));
    }

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

        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        // Enable middleware to serve generated Swagger as a JSON endpoint.
        app.UseSwagger();

        // Enable middleware to serve swagger-ui (HTML, JS, CSS, etc.),
        // specifying the Swagger JSON endpoint.
        app.UseSwaggerUI(c =>
        {
            c.SwaggerEndpoint("/swagger/v1/swagger.json", "HojeTaPago API V1");
            c.RoutePrefix = string.Empty;
        });

        app.UseHttpsRedirection();

        app.UseRouting();

        app.UseCors("CorsPolicy");

        app.UseAuthentication();

        app.UseAuthorization();

        app.UseMiddleware<AuthenticationMiddleware>();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapHub<NovoPedidoHub>("/novopedidohub");
            endpoints.MapControllers();
        });
    }
}

我在哪里使用信号r

await _novoPedidoContext.Clients.All.SendAsync("NovoPedido", ListaComandaItem);

客户端- Blazor

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // 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 https://go.microsoft.com/fwlink/?LinkID=398940
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddRazorPages();
        services.AddServerSideBlazor();
        services.AddBlazoredLocalStorage();
        services.AddBootstrapCss();
        services.AddTransient<HubConnectionBuilder>();
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
            // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();

        app.UseRouting();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapBlazorHub();
            endpoints.MapFallbackToPage("/_Host");
        });
    }
}

在那里我叫。

protected override async Task OnInitializedAsync()
{
    DataService dataService = new DataService();
    PedidosParaAceitar = new List<Comanda>(await dataService.BuscarComandasAbertas());

    connection = _hubConnectionBuilder.WithUrl(dataService.servidor + "novopedidohub",
        opt =>
        {
            opt.Transports = HttpTransportType.WebSockets;
            opt.SkipNegotiation = true;
        }).Build();

    connection.On<List<ComandaItem>>("NovoPedido", async lista =>
    {
        var idEstabelecimento = await localStorage.GetItemAsync<int>("IdEstabelecimento");

        if (lista.FirstOrDefault().Comanda.IdEstabelecimento == idEstabelecimento)
        {
            if (PedidosParaAceitar == null)
                PedidosParaAceitar = new List<Comanda>();

            if (PedidosParaAceitar.Count(x => x.Id == lista.FirstOrDefault().IdComanda) > 0)
                foreach (var comandaitem in lista)
                {
                    PedidosParaAceitar.FirstOrDefault(x => x.Id == lista.FirstOrDefault().IdComanda).ComandaItem.Add(comandaitem);
                }
            else
                PedidosParaAceitar.Add(await dataService.BuscarComandaAberta(lista.FirstOrDefault().IdComanda));

            StateHasChanged();
        }
    });

    await connection.StartAsync();
}