SignalR -找不到类型或命名空间名称“集线器”

Question

我是SignalR库的新手。我在VS2010中创建了一个新的web项目，然后在包管理器控制台中执行以下命令来设置SignalR包。

PM> Install-Package Microsoft.Aspnet.SignalR -pre

So it downloaded all the necessary files into the application.
----------
Successfully installed 'Microsoft.AspNet.SignalR 1.0.0-rc2'.
Successfully added 'jQuery 1.6.4' to demo.
Successfully added 'Microsoft.AspNet.SignalR.JS 1.0.0-rc2' to demo.
Successfully added 'Newtonsoft.Json 4.5.11' to demo.
Successfully added 'Microsoft.AspNet.SignalR.Core 1.0.0-rc2' to demo.
Successfully added 'Owin 1.0' to demo.
Successfully added 'Microsoft.AspNet.SignalR.Owin 1.0.0-rc2' to demo.
Successfully added 'Microsoft.Web.Infrastructure 1.0.0.0' to demo.
Successfully added 'Microsoft.Owin.Host.SystemWeb 1.0.0-rc2' to demo.
Successfully added 'Microsoft.AspNet.SignalR.SystemWeb 1.0.0-rc2' to demo.
Successfully added 'Microsoft.AspNet.SignalR 1.0.0-rc2' to demo.
----------

在该文件中，我编写了以下代码，

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Microsoft.AspNet.SignalR.Hubs;

namespace demo.Hubs
{
  [HubName("chatHub")]
  public class LetsChat : Hub
  {
      public void SendMsg(string Message)
      {
         Clients.All.addMessage(Message);
      }
  }
}

我无法继承此Hub类。

Type or Namespace name Hub cound not be found ( are you missing using directive or assemblr reference ? ).

Answer 1

集线器类已移动到RC2中的另一个命名空间。请更改为Microsoft.AspNet.SignalR

Answer 2

将public class LetsChat : Hub更改为

public class LetsChat : Microsoft.AspNet.SignalR.Hub

Answer 3

公认的答案对我不起作用。在我的.NET Core3.1中，这是我的代码：

using System.Threading.Tasks;
using Microsoft.AspNetCore.SignalR;

namespace SignalRChat.Hubs
{
    public class ChatHub : Hub
    {
        public async Task SendMessage(string user, string message)
        {
            await Clients.All.SendAsync("ReceiveMessage", user, message).ConfigureAwait(false);
        }
    }
}