public void ConfigureServices(IServiceCollection services)
  {
   services.AddSignalR();
   services.AddCors(options =>
   {
    options.AddPolicy("SignalrCore",
     policy => policy.AllowAnyOrigin()
         .AllowAnyHeader()
         .AllowAnyMethod());
   });
   services.AddSingleton<IServiceProvider, ServiceProvider>();
  }

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
  {
   if (env.IsDevelopment())
   {
    app.UseDeveloperExceptionPage();
   }
   //跨域支持
   app.UseCors("SignalrCore");
   app.UseSignalR(routes =>
   {
    routes.MapHub<SignalrHubs>("signalrHubs");
   });
   app.UseWebSockets();

   app.UseMvc();
  }

public class SignalrHubs:Hub
 {
  /// <summary>
  /// 创建signalr链接
  /// </summary>
  /// <param name="parentId">pid(作为用户组)</param>
  /// <param name="shopId">sid</param>
  public Task InitUser(string parentId, string shopId)
  {
   Groups.AddAsync(Context.ConnectionId, parentId);
   SignalrGroups.UserGroups.Add(new SignalrGroups()
   {
    ConnectionId = Context.ConnectionId,
    GroupName = parentId,
    ShopId = shopId
   });
   return Clients.All.InvokeAsync("NoticeOnline", "用户组数据更新完成,新增id为：" + Context.ConnectionId + " pid:" + parentId + " sid:" + shopId + "");
  }

  public override Task OnDisconnectedAsync(Exception exception)
  {
   //掉线移除用户
   var user = SignalrGroups.UserGroups.FirstOrDefault(c => c.ConnectionId == Context.ConnectionId);
   if (user != null)
   {
    SignalrGroups.UserGroups.Remove(user);
    Groups.RemoveAsync(Context.ConnectionId, user.GroupName);
   }
   return base.OnDisconnectedAsync(exception);
  }
 }

[Produces("application/json")]
 [Route("api/MRSoftPush")]
 public class MRSoftPushController : Controller
 {
  private IHubContext<SignalrHubs> hubContext;
  public MRSoftPushController(IServiceProvider service)
  {
   hubContext = service.GetService<IHubContext<SignalrHubs>>();
  }

  [HttpGet]
  public string Get()
  {
   return DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:ffff");
  }

  /// <summary>
  /// 单个connectionid推送
  /// </summary>
  /// <param name="groups"></param>
  /// <returns></returns>
  [HttpPost,Route("AnyOne")]
  public IActionResult AnyOne([FromBody]IEnumerable<SignalrGroups> groups)
  {
   if (groups != null && groups.Any())
   {
    var ids = groups.Select(c=>c.ShopId);
    var list = SignalrGroups.UserGroups.Where(c=>ids.Contains(c.ShopId));
    foreach (var item in list)
     hubContext.Clients.Client(item.ConnectionId).InvokeAsync("AnyOne", $"{item.ConnectionId}: {item.Content}");
   }
   return Ok();
  }

  /// <summary>
  /// 全部推送
  /// </summary>
  /// <param name="message"></param>
  /// <returns></returns>
  [HttpGet,Route("EveryOne")]
  public IActionResult EveryOne(string message)
  {
   hubContext.Clients.All.InvokeAsync("EveryOne", $"{message}");
   return Ok();
  }

  /// <summary>
  /// 组推送
  /// </summary>
  /// <param name="group"></param>
  /// <returns></returns>
  [HttpPost,Route("AnyGroups")]
  public IActionResult AnyGroups([FromBody]SignalrGroups group)
  {
   if (group != null)
   {
    hubContext.Clients.Group(group.GroupName).InvokeAsync("AnyGroups", $"{group.Content}");
   }
   return Ok();
  }

  /// <summary>
  /// 多参数接收方式
  /// </summary>
  /// <param name="message"></param>
  /// <returns></returns>
  [HttpGet,Route("MoreParamsRequest")]
  public IActionResult MoreParamsRequest(string message)
  {
   hubContext.Clients.All.InvokeAsync("MoreParamsRequest", message, DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:ffff"));
   return Ok();
  }
 }

<input type="text" id="ParentId" placeholder="ParentId" />
<br />
<input type="text" id="ShopId" placeholder="ShopId" />
<br />
<button id="fuckyou">用户上线</button>
<br />
<br />
<br />

<ul id="message" ></ul>

@section scripts {
 <script>
  $(function () {

   let hubUrl = 'http://192.168.0.149:8009/signalrHubs';
   let httpConnection = new signalR.HttpConnection(hubUrl);
   let hubConnection = new signalR.HubConnection(httpConnection);
   $("#fuckyou").click(function () {
    hubConnection.invoke('InitUser', $("#ParentId").val(), $("#ShopId").val());
   });
   hubConnection.on('NoticeOnline', data => {
    $("#message").append("<li>" + data + "</li>");
   });
   hubConnection.on('EveryOne', data => {
    $("#message").append("<li style=\"color:red;\">全部推送：" + data + "</li>");
   });
   hubConnection.on('AnyGroups', data => {
    $("#message").append("<li style=\"color:black;\">单个用户组推送：" + data + "</li>");
   });
   hubConnection.on('AnyOne', data => {
    $("#message").append("<li style=\"color:blue;\">单个ID推送：" + data + "</li>");
   });
   hubConnection.on('MoreParamsRequest', (message, date) => {
    $("#message").append("<li style=\"color:green;\">多参数接收：" + message + " : " + data + "</li>");
   });
   hubConnection.start();

  });
 </script>
}