运行时创建HTTP请求及请求的处理

1、发起请求

下面这个方法的作用就是接收要发送的数据及数据要发送到的URL，然后返回响应数据

    protected string SendRequest(string data,string url)
    {
        WebRequest req = WebRequest.Create(url);
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";
        byte[] sendBytes = Encoding.UTF8.GetBytes(data);
        req.ContentLength = sendBytes.Length;
        Stream reqStream = req.GetRequestStream();
        reqStream.Write(sendBytes, 0, sendBytes.Length);
        reqStream.Close();

        WebResponse res = req.GetResponse();
        Stream resStream = res.GetResponseStream();
        StreamReader sr = new StreamReader(resStream, Encoding.UTF8);
        string resData = sr.ReadToEnd();
        sr.Close();
        resStream.Close();
        return resData;
    }

使用示例：

    protected void btnSubscribe_Click(object sender, EventArgs e)
    {
        string FileName = Server.MapPath("订购.xml");
        FileStream fs = new FileStream(FileName, FileMode.Open);
        StreamReader sr = new StreamReader(fs);
        string ReqData = sr.ReadToEnd();
        sr.Close();
        fs.Close();
        txtResponse.Text = SendRequest(ReqData, "http://localhost:2102/InterWeb/subscribe.htm");
    }

2、处理请求
　　接收要简单一些，用下面这两句代码就可以了

            StreamReader sr = new StreamReader(Request.InputStream);
            ReqData = sr.ReadToEnd();

3、总结

这种处理方式一般会用在一些对外的接口等的开发中，以XML传递协议数据。