Com.Alipay/Submit.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;
using System.Web;
using System.Xml;
using System.IO;
using System.Security;
using System.Security.Cryptography;
using System.Net;

namespace Com.Alipay
{
    public class Submit
    {
        // Fields
        private static string _input_charset;
        private static string _key;
        private static string _sign_type;

        // Methods
        static Submit() { }
        public Submit() { }
        public static string BuildFormHtml(SortedDictionary<string, string> sParaTemp, string gateway, string strMethod, string strButtonValue)
        {
            Dictionary<string, string> dicPara = new Dictionary<string, string>();
            dicPara = BuildRequestPara(sParaTemp);
            StringBuilder sbHtml = new StringBuilder();
            sbHtml.Append("<form id='alipaysubmit' name='alipaysubmit' action='" + gateway + "_input_charset=" + _input_charset + "' method='" + strMethod.ToLower().Trim() + "'>");
            foreach (KeyValuePair<string, string> temp in dicPara)
            {
                sbHtml.Append("<input type='hidden' name='" + temp.Key + "' value='" + temp.Value + "'/>");
            }
            sbHtml.Append("<input type='submit' value='" + strButtonValue + "' style='display:none;'></form>");
            sbHtml.Append("<script>document.forms['alipaysubmit'].submit();</script>");
            return sbHtml.ToString();
        }
        private static Dictionary<string, string> BuildRequestPara(SortedDictionary<string, string> sParaTemp)
        {
            Dictionary<string, string> sPara = new Dictionary<string, string>();
            string mysign = "";
            sPara = Core.FilterPara(sParaTemp);
            mysign = Core.BuildMysign(sPara, _key, _sign_type, _input_charset);
            sPara.Add("sign", mysign);
            sPara.Add("sign_type", _sign_type);
            return sPara;
        }
        private static string BuildRequestParaToString(SortedDictionary<string, string> sParaTemp)
        {
            Dictionary<string, string> sPara = new Dictionary<string, string>();
            return Core.CreateLinkString(BuildRequestPara(sParaTemp));
        }
        public static XmlDocument SendGetInfo(SortedDictionary<string, string> sParaTemp, string gateway)
        {
            string strRequestData = BuildRequestParaToString(sParaTemp);
            string strUrl = gateway + strRequestData;
            XmlDocument xmlDoc = new XmlDocument();
            try
            {