解决C#WindowsForms客户端连接SignalR服务器时出现的错误

我正在使用ASP.NET网站上的股票SignalR示例，具体参考：

官方文档链接

服务器运行正常，Javascript客户端能够按照预期工作并在彼此之间进行通信。服务器和Javascript客户端均部署在IIS上。

Javascript客户端位于：

http://192.168.1.5:8080/RTStreamer/SignalR.Sample/StockTicker.html

现在我尝试使用C# Windows Forms客户端进行连接，但遇到了问题。以下是相关代码片段：

private void Form1_Load(object sender, EventArgs e)
{
    var cOnnection= new HubConnection("http://192.168.1.5:8080/RTStreamer/signalr");
    IHubProxy proxy = connection.CreateHubProxy("StockTickerHub");
    try
    {
        connection.Start().Wait();
        var stocks = proxy.Invoke>("GetAllStocks").Result;
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.ToString());
    }
}

在尝试调用 connection.Start() 方法时，遇到以下错误：

System.AggregateException: One or more errors occurred. ---> Microsoft.AspNet.SignalR.Client.HttpClientException: StatusCode: 500, ReasonPhrase: 'Internal Server Error', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
{
  Transfer-Encoding: chunked
  Cache-Control: private
  Date: Tue, 12 Aug 2014 13:46:31 GMT
  Server: Microsoft-IIS/8.5
  X-AspNet-Version: 4.0.30319
  X-Powered-By: ASP.NET
  Content-Type: text/html; charset=utf-8
}
   at Microsoft.AspNet.SignalR.Client.Http.DefaultHttpClient.<>c__DisplayClass2.b__1(HttpResponseMessage responseMessage)
   at Microsoft.AspNet.SignalR.TaskAsyncHelper.<>c__DisplayClass19`2.b__17(Task`1 t)
   at Microsoft.AspNet.SignalR.TaskAsyncHelper.TaskRunners`2.<>c__DisplayClass3a.b__39(Task`1 t)
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at TraderClient.Form1.Form1_Load(Object sender, EventArgs e) in c:\Ark\Form1.cs:line 31
---> (Inner Exception #0) Microsoft.AspNet.SignalR.Client.HttpClientException: StatusCode: 500, ReasonPhrase: 'Internal Server Error', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
{
  Transfer-Encoding: chunked
  Cache-Control: private
  Date: Tue, 12 Aug 2014 13:46:31 GMT
  Server: Microsoft-IIS/8.5
  X-AspNet-Version: 4.0.30319
  X-Powered-By: ASP.NET
  Content-Type: text/html; charset=utf-8
}
   at Microsoft.AspNet.SignalR.Client.Http.DefaultHttpClient.<>c__DisplayClass2.b__1(HttpResponseMessage responseMessage)
   at Microsoft.AspNet.SignalR.TaskAsyncHelper.<>c__DisplayClass19`2.b__17(Task`1 t)
   at Microsoft.AspNet.SignalR.TaskAsyncHelper.TaskRunners`2.<>c__DisplayClass3a.b__39(Task`1 t)<---

这是Hub代码：

namespace Microsoft.AspNet.SignalR.StockTicker
{
    [HubName("stockTicker")]
    public class StockTickerHub : Hub
    {
        private readonly StockTicker _stockTicker;
        public StockTickerHub()
            : this(StockTicker.Instance)
        {
        }
        public StockTickerHub(StockTicker stockTicker)
        {
            _stockTicker = stockTicker;
        }
        public IEnumerable GetAllStocks()
        {
            return _stockTicker.GetAllStocks();
        }
        ...
    }
}

### 解决方法

确保您的项目配置与官方文档一致。对于我的.NET客户端，正确的代码如下：

var cOnnection= new HubConnection("http://localhost:65069/");
IHubProxy proxy = connection.CreateHubProxy("stockTickerMini");
try
{
    connection.Start().Wait();
    var stocks = proxy.Invoke>("GetAllStocks").Result;
}
...

在我的示例中，StockTicker.html 页面位于 http://localhost:65069/StockTicker.html，并且根据属性，集线器名称为 stockTickerMini。

在您的情况下，下面的值应该是正确的：

var cOnnection= new HubConnection("http://192.168.1.5:8080/RTStreamer");
IHubProxy proxy = connection.CreateHubProxy("stockTicker");

此外，请检查服务器端日志以获取更多详细的错误信息，并确保服务器端的SignalR配置正确无误。