HttpWebRequest传查询条件到其他网站查询
用 HttpWebRequest传查询条件到其他网站查询（http://www.uuxoo.com/violat/query），获取返回页面，试过百度可以，但这个网站不行，不能地址传参数！！！就是调用这个网站的查违章功能 HttpWebRequest，提交数据
[解决办法]
System.Net.HttpWebRequest wr = (System.Net.HttpWebRequest)System.Net.WebRequest.Create("http://www.uuxoo.com/violat/query");
wr.Accept = "*/*"; //接受任意文件
wr.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.1.4322)"; // 模拟使用IE在浏览
wr.AllowAutoRedirect = true;//是否允许302

wr.Referer = "http://www.uuxoo.com/violat/query"; //当前页面的引用
System.Net.HttpWebResponse wrs = (System.Net.HttpWebResponse)wr.GetResponse();
System.IO.Stream sw = wrs.GetResponseStream();

System.IO.StreamReader sr = new System.IO.StreamReader(sw, System.Text.Encoding.UTF8);

Response.Write(sr.ReadToEnd());
sr.Close();
sr.Dispose();
[解决办法]
http://www.uuxoo.com/violat/query
-----------------------------215492619225726
Content-Disposition: form-data; name="vehicle_reg_no"

NB100
-----------------------------215492619225726
Content-Disposition: form-data; name="vehicle_id_no"

128372
-----------------------------215492619225726
Content-Disposition: form-data; name="formhash"

0663c78a
-----------------------------215492619225726
Content-Disposition: form-data; name="have_submit"

yes
-----------------------------215492619225726
Content-Disposition: form-data; name="submit"

1
-----------------------------215492619225726
Content-Disposition: form-data; name="vehicle_area"

èμ￡
-----------------------------215492619225726
Content-Disposition: form-data; name="vehicle_type"

02
-----------------------------215492619225726--

这个不知道可不可以帮到你
[解决办法]

  
     static CookieContainer cookies = new CookieContainer();
      public static string PostData(string url, string postDate, string refererUrl)
        {

            string html;
            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.KeepAlive = true; 
 
                request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
                request.Referer = refererUrl;
                request.UserAgent = "Mozilla/5.0 (Windows NT 6.0; rv:15.0) Gecko/20100101 Firefox/15.0.1";
                request.ContentType = "application/x-www-form-urlencoded";
                request.Method = "POST";
                request.CookieContainer = cookies;
                Stream requestStream = request.GetRequestStream();
                StreamWriter writer = new StreamWriter(requestStream);
                writer.Write(postDate);
                writer.Close();
                requestStream.Close();
                HttpWebResponse response = null;
                StreamReader reader = null;
                response = (HttpWebResponse)request.GetResponse();

                reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);

                html = reader.ReadToEnd();

            }
            catch (Exception err)
            {
                return err.Message;
            }
            return html;
        }