using System;

using System.Collections.Generic;

using System.Collections.Specialized;

using System.IO;

using System.Linq;

using System.Net;

using System.Text;

using System.Web;

public class Program

{

    public static void Main()

    {

        //財政部電子發票API的Url

            string url = "https://ap1.fcg1688.net/SearchMember";

            string appId = "";//向財政部申請的appId

            string pCode = ""; //愛心碼

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

            request.Method = "POST";

            request.ContentType = "application/x-www-form-urlencoded";

​

            //必須透過ParseQueryString()來建立NameValueCollection物件，之後.ToString()才能轉換成queryString

            NameValueCollection postParams = System.Web.HttpUtility.ParseQueryString(string.Empty);

            postParams.Add("AgentCode", "WD");

            postParams.Add("Currency", "CNY");

            postParams.Add("Params", "euiGf7lHruHrwt24dZFOsqdQnztf1MXg6jlA3WZa8UI");

            postParams.Add("Sign", "380880742f058405b2d39ae12bf67d5c");

​

            //Console.WriteLine(postParams.ToString());// 將取得"version=1.0&action=preserveCodeCheck&pCode=pCode&TxID=guid&appId=appId", key和value會自動UrlEncode

            //要發送的字串轉為byte[] 

            byte[] byteArray = Encoding.UTF8.GetBytes(postParams.ToString()); 

            using (Stream reqStream = request.GetRequestStream())

            {

                reqStream.Write(byteArray, 0, byteArray.Length);

            }//end using

            //API回傳的字串

            string responseStr = "";

            //發出Request

            using (WebResponse response = request.GetResponse())

            { 

                using (StreamReader sr = new StreamReader(response.GetResponseStream(),Encoding.UTF8))

                {

                     responseStr = sr.ReadToEnd();

                }//end using  

            }

            Console.Write(responseStr);//印出回傳字串

​

    }

}