使用HttpWebRequest访问网页及获取数据

      使用HttpWebRequest访问网页及获取数据，伪代码如下：

       //第一步：创建客户端
        string site = "http://域名/ts.req?type=0";
        HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(site);
        httpWebRequest.Method = "POST";
        httpWebRequest.Timeout = 10;
        httpWebRequest.ContentType = "application/x-www-form-urlencoded";
        Stream newStream = httpWebRequest.GetRequestStream();
       
        //第二步将要传递数据定义形成数据流
        string postData = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n"
                        + "<seegle>\n"
                        + "<tsauth>\n"
                        + "<user>" + "你的用户ID" + "</user>\n"
                        + "<pass>" + "你指定的密码" + "</pass>\n"//可以是固定值或仍使用用户ID
                        + "</tsauth>\n"
                        + "</seegle>";
        ASCIIEncoding encoding = new ASCIIEncoding();
        byte[] inBuf = encoding.GetBytes(postData);
        //将数据流写入
        newStream.Write(inBuf, 0, inBuf.Length);
        newStream.Close();
        //第三步获取返回信息
        HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
        System.IO.Stream receiveStream = httpWebResponse.GetResponseStream();
        StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8);
        //通过readStream可以获得返回数据
        string getData = readStream.ReadToEnd();
        //如:<?xml version="1.0" encoding="UTF-8" ?>
        //<seegle>
        //      <seq>xxxxxxxxxxxxxxxxxxxxxxxxx</seq>
        //      <tsauth>
        //            <ret>返回码</ret>
        //            <msg>返回码对应信息</msg>
        //      </tsauth>
        //</seegle>
        //获取seq部分
        int p = getData.IndexOf("<seq>");
        string seq = "";
        if (p > 0)
        {
            seq = getData.Substring(p, getData.IndexOf("</seq>") - p);
        }
        //增加会议数据
        postData = "略";
        //获取数据(不能确定是否正确,不行就仿照上面第三步)
        readStream = new StreamReader(receiveStream, Encoding.UTF8);
        getData = readStream.ReadToEnd();
        //判断是否正确,略