没有发现SignalR回声/协商？

Question

Index.cshtml

@{
    ViewBag.Title = "Index";
}
<script src="~/Scripts/jquery.signalR-2.0.0.min.js"></script>
<script>
$(function () {
    var connection = $.connection('/echo');

    connection.received(function (data) {
        $('#messages').append('<li>' + data + '</li>');
    });

    connection.start().done(function () {
        $("#broadcast").click(function () {
            connection.send($('#msg').val());
        });
    });

});
</script>
<input type="text" id="msg" />
<input type="button" id="broadcast" value="broadcast" />

<ul id="messages">
</ul>

startup.cs

using Microsoft.Owin;
using Owin;
using UI;

namespace UI
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            app.MapSignalR();
        }
    }
}

MyConnection.cs

public class MyConnection : PersistentConnection
{
    protected override Task OnConnected(IRequest request, string connectionId)
    {
        return Connection.Send(connectionId, "Welcome!");
    }

    protected override Task OnReceived(IRequest request, string connectionId, string data)
    {
        return Connection.Broadcast(data);
    }
}

我是SignalR的新手.当我启动项目时,我收到以下错误:

http:// localhost:49820/echo/negotiate？clientProtocol = 1.3&_ = 1383403303981 404(未找到)

这是什么原因,我该如何解决？我无法找到有关此问题的任何解决方案.(.net framework 4.5和signalR 2.0)

Answer 1

我目前无法调试您的代码,但我认为您应该考虑两个可能的问题.

1)您在启动集线器功能中错过了"$ .connection.hub".当您从服务器端向客户端调用接收方法时,需要添加"connection.client.received".它应该如下所示:

$(function () {
    var connection = $.connection('/echo');

    connection.client.received(function (data) {
        $('#messages').append('<li>' + data + '</li>');
    });

    $.connection.hub.start().done(function () {
        $("#broadcast").click(function () {
            connection.send($('#msg').val());
        });
    });

});

2)您需要映射持久连接.我相信signalR 1.x应该是这样的:

RouteTable.Routes.MapConnection<MyConnection>("echo", "/echo");

但是在SignalR 2.0中,您需要在集线器Startup类中执行以下操作.以下只是一个例子.

public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            app.MapSignalR<MyConnection>("/echo");
        }