Http POST网络请求

using System.IO;
using System.Net;
using System.Text;
    /// <summary>
    /// POST网络请求
    /// </summary>
    public class HTTPNetTool
    {
        /// <summary>
        /// 网络请求主方法
        /// </summary>
        /// <returns>返回json结果，可以通过下面Deserialize 方法转换成对象直接解析数据。</returns>
        /// <param name="url”网络接口</param>
        /// <param name="param">参数字符串，通过下面的Serialize方法，由类转换得到。</param>
        public static string PostMoths(string url, string param)
        {
            string strURL = url;
            System.Net.HttpWebRequest request;
            request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);
            request.Timeout = 200000;
            request.Method = "POST";
            request.ContentType = "application/json;charset=UTF-8";
            string paraUrlCoded = param;
            byte[] payload;
            payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
            request.ContentLength = payload.Length;
            Stream writer = request.GetRequestStream();
            writer.Write(payload, 0, payload.Length);
            writer.Close();
            System.Net.HttpWebResponse response;
            response = (System.Net.HttpWebResponse)request.GetResponse();
            System.IO.Stream s;
            s = response.GetResponseStream();
            string StrDate = "";
            string strValue = "";
            StreamReader Reader = new StreamReader(s, Encoding.UTF8);
            while ((StrDate = Reader.ReadLine()) != null)
            {
                strValue += StrDate + "\r\n";
            }
            return strValue;
        } 
        /// <summary>
        /// 把json字符串转成对象
        /// </summary>
        /// <typeparam name="T">对象</typeparam>
        /// <param name="data">json字符串</param> 
        public static T Deserialize<T>(string data)
        { 
            System.Web.Script.Serialization.JavaScriptSerializer json = new System.Web.Script.Serialization.JavaScriptSerializer();
            return json.Deserialize<T>(data);
        } 
        /// <summary>
        /// 把对象转成json字符串
        /// </summary>
        /// <param name="o">对象</param>
        /// <returns>json字符串</returns>
        public static string Serialize(object o)
        {
            System.Text.StringBuilder sb = new System.Text.StringBuilder();
            System.Web.Script.Serialization.JavaScriptSerializer json = new System.Web.Script.Serialization.JavaScriptSerializer();
            json.Serialize(o, sb);
            return sb.ToString();
        } 
    }