Asp.net 信号器公用程序集或命名空间不可用

我想要一个聊天应用程序为我的网站我有信号聊天室，但

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名称空间不可用，上面是signal r chat app的代码

没有通用组件，因此您可以使用

 using Microsoft.AspNet.SignalR;
 using Signalr.common;//It is not available

  namespace Chat_App.Hubs
 {
 public class ChatHub :Hub
{
    public void Send(string name, string message)
    {
        // Call the addNewMessageToPage method to update clients.
        Clients.All.addNewMessageToPage(name, message);
    }
    public void Connect(string userName)
    {

        var id = Context.ConnectionId;

        if (ConnectedUsers.Count(x => x.ConnectionId == id) == 0)
        {

            ConnectedUsers.Add(new UserDetail { ConnectionId = id, UserName = userName });

            // send to caller
            Clients.Caller.onConnected(id, userName, ConnectedUsers, CurrentMessage);

            // send to all except caller client
            Clients.AllExcept(id).onNewUserConnected(id, userName);

        }

    }