HttpWebRequest GetResponse.如何等待该响应? [英] HttpWebRequest GetResponse. How to wait for that response?

问题描述

我正在使用HttpWebRequest发送一些SMS.但是有时消息似乎发送两次，三遍甚至更多遍，对所有过程进行检查似乎都可以.

I'm sending some SMS using HttpWebRequest. But some times the messages appear to send double, three times and more reviewing all the proccess appear to be ok.

我认为唯一的一件事是HttpWebRequest正在异步工作.

The only thing i think is HttpWebRequest is working asynchronus.

这是我的代码

    public bool sendSmsGateway(string tcDestino, string tcMensaje, string tcTitulo = "")
    {
        bool lReturn = false;
        string contenido = HttpUtility.UrlEncode(tcMensaje);
        string lcTitulo = "SMS Sender";
        if (!String.IsNullOrEmpty(tcTitulo))
        {
            lcTitulo = tcTitulo;
        }
        lcTitulo = HttpUtility.UrlEncode(lcTitulo);
        string fechaEnvio = DateTime.Now.ToString("s"); 
        string url = string.Format(StrSMSGatewayURL, StrSMSGatewayUsuario, StrSMSGatewayPassword, tcDestino, contenido, lcTitulo, fechaEnvio);
        HttpWebRequest enviar = (HttpWebRequest)WebRequest.Create(url);
        string respuesta = new StreamReader(enviar.GetResponse().GetResponseStream()).ReadToEnd();

        StrSMSGatewayRespuesta = respuesta.Trim();
        if (StrSMSGatewayRespuesta  == StrSMSGatewayRespuestaOk.Trim())
        {
            lReturn = true;
        }
        return lReturn;
    }

此代码在循环例程中运行，该例程在以下情况下发送消息并将其标记为已发送:

this code runs in loop routine that send the message and mark it as sent when:

string respuesta = new StreamReader(enviar.GetResponse().GetResponseStream()).ReadToEnd();

返回正确的代码.

我的问题是..有一种方法可以停止该过程，或强制代码等待直到(httpWebRequest send the message and get the response)或(timeout succeed)

My question is.. there is a way to stop the proccess, or force the code to wait until the (httpWebRequest send the message and get the response) or (timeout succeed)

推荐答案

HttpWebRequest.BeginGetResponse() ，那么您将需要另一种机制来等待异步接收响应.

HttpWebRequest.GetResponse() is a synchronous call, so you don't need to have a different mechanism for blocking the current thread. If you were using the asynchronous method HttpWebRequest.BeginGetResponse(), then you would need to have another mechanism to wait for the response to be asynchronously received.

如果要发送多条SMS消息，则可能是由于在收到StrSMSGatewayRespuesta时未收到正确的响应代码而引起的.如果您输入的代码错误，但实际上已发送了该消息，则由于您将其标记为未发送，因此该消息很可能会再次发送.

If you're sending multiple SMS messages, then this is probably caused by not receiving the correct response code when you get StrSMSGatewayRespuesta. If you get the wrong code but the message was actually sent, then the message is likely to be sent again since you're marking it as not sent.

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