c# - HttpWebRequest 向 WebService 传递参数

Question

我有一个需要将数据传递给 Web 服务 (SMS) 的网页，我尝试使用它WebRequest来完成这项工作，但是当我使用此类时，会出现以下错误：

Cannot close stream until all bytes are written

在此行之后的行中：

stOut.WriteLine(strNewValue,number,text);

问题是什么？我尝试使用Flush()但也没有工作

public class SendSms
{
    public SendSms(string number, string text)
    {
         string strNewValue;
         string strResponse;

         HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://www.buymessage.com/ostazSms/send.php");          

         req.Method = "POST";
         req.ContentType = "application/x-www-form-urlencoded";
         strNewValue = "usr=****&pwd=*****&to={0}&msg={1}"; 
         req.ContentLength = strNewValue.Length;

         using(StreamWriter stOut = new StreamWriter (req.GetRequestStream(), System.Text.Encoding.Unicode))
         {
             stOut.WriteLine(strNewValue,number,text);
         }

        StreamReader stIn = new StreamReader(req.GetResponse().GetResponseStream());
        strResponse = stIn.ReadToEnd();
        stIn.Close();  
    }
}

Answer 1

您的问题是您调用WriteLine，这可能不会发送所有数据。

这是一个对发布数据进行编码并将其全部发送的片段：

string strNewValue = string.Format("usr=****&pwd=*****&to={0}&msg={1}", "A", "B");
byte[] byteArray = Encoding.UTF8.GetBytes (strNewValue);
req.ContentLength = byteArray.Length;

using (Stream dataStream = req.GetRequestStream ()) {
    dataStream.Write (byteArray, 0, byteArray.Length);
}