【问题标题】：Self hosting SignalR in linqpad在 linqpad 中自托管 SignalR
【发布时间】：2015-10-23 06:32:13
【问题描述】：

场景

我正在尝试使用 linqpad 自行托管 SignalR。

脚本

// I have uploaded to instant share here: http://share.linqpad.net/578ol2.linq 

// Import the following nuget packages:
// Microsoft.AspNet.SignalR.SelfHost
// Microsoft.Owin.Cors

#define NONEST

void Main()
{
    var baseUrl = @"http://localhost:8080/";

    using (WebApp.Start<Startup>(baseUrl))
    {
        Process.Start(baseUrl + "index.html");

        Console.WriteLine("Server running at " + baseUrl);
        Console.ReadLine();
    }
}

public class Startup
{
    public readonly string Html = @"
<!DOCTYPE html>
<html>
<head>
    <title>SignalR Simple Chat</title>
</head>
<body>
    <div class='container'>
        <input type='text' id='message' />
        <input type='button' id='sendmessage' value='Send' />
        <input type='hidden' id='displayname' />
        <ul id='discussion'></ul>
    </div>
    <script src='https://code.jquery.com/jquery-1.6.4.js'></script>
    <script src='http://ajax.aspnetcdn.com/ajax/signalr/jquery.signalr-2.2.0.js'></script>
    <script src='http://localhost:8080/signalr/hubs'></script>

    <script type='text/javascript'>
        $(function () {
            $.connection.hub.url = 'http://localhost:8080/signalr';
            $.connection.hub.logging = true;

            var chat = $.connection.myHub;

            chat.client.addMessage = function (name, message) {
                var encodedName = $('<div />').text(name).html();
                var encodedMsg = $('<div />').text(message).html();

                $('#discussion').append('<li><strong>' + encodedName + '</strong>:&nbsp;&nbsp;' + encodedMsg + '</li>');
            };

            $('#displayname').val(prompt('Enter your name:', ''));
            $('#message').focus();

            $.connection.hub.start().done(function () {
                $('#sendmessage').click(function () {
                    chat.server.send($('#displayname').val(), $('#message').val());
                    $('#message').val('').focus();
                });
            });
        });
    </script>
</body>
</html>
".Trim();

    public void Configuration(IAppBuilder app)
    {
        app.UseCors(CorsOptions.AllowAll);
        app.MapSignalR();

        app.Map("/index.html", config =>
        {
            config.Run(context => 
            {
                context.Response.ContentType = "text/html";
                return context.Response.WriteAsync(Html);
            });
        });
    }
}

public class MyHub : Hub
{
    public void Send(string name, string message)
    {
        Clients.All.addMessage(name, message);
    }
}

结果

如果您查看浏览器控制台，您会发现 SignalR 最终会耗尽所有传输，因此无法在客户端和服务器之间创建连接

SignalR: Client subscribed to hub 'myhub'.
Negotiating with 'http://localhost:8080/signalr/negotiate?clientProtocol=1.5&connectionData=%5B%7B%22name%22%3A%22myhub%22%7D%5D'.
serverSentEvents transport starting.
Attempting to connect to SSE endpoint 'http://localhost:8080/signalr/connect?transport=serverSentEvents&clientProt…joHW8a9m5Q%3D%3D&connectionData=%5B%7B%22name%22%3A%22myhub%22%7D%5D&tid=1'.
EventSource connected.
serverSentEvents transport timed out when trying to connect.
EventSource calling close().
serverSentEvents transport failed to connect. Attempting to fall back.
foreverFrame transport starting.
Forever Frame is not supported by SignalR on browsers with SSE support.
foreverFrame transport failed to connect. Attempting to fall back.
longPolling transport starting.
Opening long polling request to 'http://localhost:8080/signalr/connect?transport=longPolling&clientProtocol=…QeRv75joHW8a9m5Q%3D%3D&connectionData=%5B%7B%22name%22%3A%22myhub%22%7D%5D'.
longPolling transport timed out when trying to connect.
Aborted xhr request.
longPolling transport failed to connect. Attempting to fall back.
Fallback transports exhausted.
Stopping connection.
Fired ajax abort async = true.

但是，在控制台应用程序中，同样的代码可以正常工作

问题

有谁知道为什么这段代码在 linqpad 中托管时会失败，但在控制台应用程序中托管时可以工作？

【问题讨论】：

你的 LinqPad 版本是多少？
我正在使用 Linqpad 5

标签： signalr linqpad

【解决方案1】：

我倾向于某种连接问题，而不是 LinqPad 问题，因为我能够运行您的代码而没有问题。我也是在版本 5 下运行的。你碰巧有 3r 方防火墙吗？

只是为了确认一下，预期的行为是什么？当我运行它时，我的浏览器会弹出，要求我输入一个名称。然后我可以发送“消息”，它出现在文本框下方的页面上。

【讨论】：

刚刚再次测试它现在似乎可以工作了..感谢您的帮助