以post方式携窗体等参数向服务器发送请求 发出去的字节流 返回的内容

     //一、截取以post发送到服务器的申请信息流
        string postData = "aa=iceapple.net&bb=yibin.net" + TextBox1.Text;//指的是使用post方式提交的数据
        byte[] data = System.Text.Encoding.ASCII.GetBytes(postData);//参数必须变换成内容是Ascii码的 字节数组
 
        string url = "http://localhost:10730/WebSite32/Default.aspx";//1.如果是get方式的话，直接在url后+"?参数1=值1&参数2=值2..."即可 
//2.最后要落实到动态网页(类似Default.aspx/jsp等)才能在后面二中返回字符串流
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";//这里的ContentType很重要!
        req.ContentLength = data.Length;
        Stream requestStream = req.GetRequestStream();//获取数据流,该流是可写入的
        requestStream.Write(data, 0, data.Length);//发送数据流
        requestStream.Close();
 
        //二、返回1.htm传过去的相应参数后返回的网页字符串流
        HttpWebResponse res = (HttpWebResponse)req.GetResponse();
        StreamReader sr = new StreamReader(res.GetResponseStream(), System.Text.Encoding.UTF8);
        string backstr = sr.ReadToEnd();
        Response.Write(backstr);
        sr.Close();
        res.Close();
 
///
应用HttpWebRequest接收post或get数据
 
 

  
  
/*接收post数据
  
  
      string url=http://liuleiceshi.hexun.com/payment/WebForm1.aspx;
  
  
     string stext = HttpRequestFromPost(url, "s=1213213&t=1111");
  
  
*/
  
  
private string HttpRequestFromPost(string maiurl, string paramurl)
    {
      string strHtmlContent = "";
      HttpWebRequest request;
      try
      {
        Encoding encoding = Encoding.GetEncoding("GB2312");
  
  
        //声明一个HttpWebRequest请求
        request = (HttpWebRequest)WebRequest.Create(maiurl);
        request.Method = "POST";
        request.ContentType = "application/x-www-form-urlencoded";
        request.AllowAutoRedirect = true;
        byte[] Postbyte = Encoding.ASCII.GetBytes(paramurl);
        request.ContentLength = Postbyte.Length;
  
  
        Stream newStream = request.GetRequestStream();
        newStream.Write(Postbyte, 0, Postbyte.Length);//把参数用流对象写入request对象中   
        newStream.Close();
  
  
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();//获得服务器响应对象  
        Stream resStream = response.GetResponseStream();//转成流对象   
        StreamReader sr = new StreamReader(resStream, encoding);
        strHtmlContent = sr.ReadToEnd();
        response.Close();
      }
      catch (Exception ex)
      {
        help.log("网支中连接接口出现问题,错误信息："+help.SetErrorInfo(ex.Message));
      }
      finally
      {
        request = null;
      }
      if (strHtmlContent == null)
        strHtmlContent = "";
      return strHtmlContent;
    }
  
  
/*
  
  
接收get数据
  
  
      string url="http://liuleiceshi.hexun.com/payment/WebForm1.aspx";
      string stext = help.GetHtmlContent(url);
*/
  
  
    public string GetHtmlContent(string Url)
    {
      string strHtmlContent = "";
      HttpWebRequest request;
      try
      {
        //声明一个HttpWebRequest请求
        request = (HttpWebRequest)WebRequest.Create(Url);
        //连接超时时间
        request.Timeout = 20000;
        request.Headers.Set("Pragma", "no-cache");
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Stream streamHtmlCode = response.GetResponseStream();
        Encoding encoding = Encoding.GetEncoding("GB2312");
        StreamReader streamReader = new StreamReader(streamHtmlCode, encoding);
        strHtmlContent = streamReader.ReadToEnd();
      }
      catch (Exception ex)
      {
        help.log("网支中连接接口出现问题,错误信息："+SetErrorInfo(ex.Message));
      }
      finally
      {
        request = null;
      }
      if (strHtmlContent == null)
        strHtmlContent = "";
      return strHtmlContent;
    }