Question

我一直在尝试按照＆＃34; Asp.Net SignalR聊天室＆＃34;来实现聊天室。关于CodeProject（http://www.codeproject.com/Articles/562023/Asp-Net-SignalR-Chat-Room）的教程。但是，我收到错误＆＃34; Hubs.ChatHubs.OnDisconnected（）：找不到合适的方法来覆盖＆＃34;

ChatHub类：

public class ChatHub : Hub
{
    #region Data Members

    static List<UserDetail> ConnectedUsers = new List<UserDetail>();
    static List<MessageDetail> CurrentMessage = new List<MessageDetail>();

    #endregion

    #region Methods

    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);

        }

    }

    public void SendMessageToAll(string userName, string message)
    {
        // store last 100 messages in cache
        AddMessageinCache(userName, message);

        // Broad cast message
        Clients.All.messageReceived(userName, message);
    }

    public void SendPrivateMessage(string toUserId, string message)
    {

        string fromUserId = Context.ConnectionId;

        var toUser = ConnectedUsers.FirstOrDefault(x => x.ConnectionId == toUserId);
        var fromUser = ConnectedUsers.FirstOrDefault(x => x.ConnectionId == fromUserId);

        if (toUser != null && fromUser != null)
        {
            // send to 
            Clients.Client(toUserId).sendPrivateMessage(fromUserId, fromUser.UserName, message);

            // send to caller user
            Clients.Caller.sendPrivateMessage(toUserId, fromUser.UserName, message);
        }

    }

    public override System.Threading.Tasks.Task OnDisconnected()
    {
        var item = ConnectedUsers.FirstOrDefault(x => x.ConnectionId == Context.ConnectionId);
        if (item != null)
        {
            ConnectedUsers.Remove(item);

            var id = Context.ConnectionId;
            Clients.All.onUserDisconnected(id, item.UserName);

        }

        return base.OnDisconnected();
    }


    #endregion

    #region private Messages

    private void AddMessageinCache(string userName, string message)
    {
        CurrentMessage.Add(new MessageDetail { UserName = userName, Message = message });

        if (CurrentMessage.Count > 100)
            CurrentMessage.RemoveAt(0);
    }

    #endregion

}

有关为何发生这种情况的任何线索？

Answer 1

对于版本2.1.1+更改

public override Task OnDisconnected()

到

public override Task OnDisconnected(bool stopCalled)

Answer 2

你的signalR依赖中有一个不匹配，他们改变了2.1.1中OnDisconnected的签名

所以将所有项目升级到2.1.1或将所有项目降级到2.1.0并且它应该可以正常工作

“OnDisconnected（）：找不到合适的方法来覆盖” - SignalR

2 个答案: