硬代码IPEndpoint在ASP.Net中使用ServicePoint.BindIPEndPointDelegate提供异常

Question

我正试图为我的webRequest绑定我的出站IP

HttpWebRequest reqhttp = (HttpWebRequest)req;
reqhttp.ServicePoint.BindIPEndPointDelegate = new System.Net.BindIPEndPoint(BindIPEndPointCallback);
reqhttp.Credentials = null;
reqhttp.AuthenticationLevel = AuthenticationLevel.None;
reqhttp.Method = "POST";
reqhttp.ContentLength = send.Length;
reqhttp.ContentType = "text/xml";

Stream dataStream = reqhttp.GetRequestStream();
dataStream.Write(send, 0, send.Length);
dataStream.Close();

 public delegate IPEndPoint BindIPEndPoint(ServicePoint servicePoint, IPEndPoint remoteEndPoint, int retryCount);

    private IPEndPoint BindIPEndPointCallback(ServicePoint servicePoint, IPEndPoint remoteEndPoint, int retryCount)
    {
        return new IPEndPoint(IPAddress.Parse("111.111.11.11"), 0); //bind to a specific ip address on your server
    }

由于某些原因，当我这样做时，它会抛出一个错误。

如果未能执行此行

Stream dataStream = reqhttp.GetRequestStream();

现有连接被远程主机强制关闭

我不明白这里出了什么问题。

任何一个人都能帮助理解这段代码的错误并解决这个问题吗？

Answer 1

GetRequestStream()方法将首先触发BindIPEndPointDelegat，然后尝试连接到远程服务器。如果绑定到不存在的本地终结点，或者远程服务器不可用，则会得到异常。

Answer 2

试试像这样的东西

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(myIP);
request.Proxy = myProxy;
ServicePoint sp = ServicePointManager.FindServicePoint(new Uri(myIP), myProxy);
sp.BindIpEndPointDelegate = new BindIpEndPoint(BindIpEndPointCallback);
HttpWebResponse = (HttpWebResponse)request.GetResponse();