Com.Alipay/Core.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 Core
    {
        // Methods
        public Core() { }
        // public static string BuildMysign(Dictionary<string, string> dicArray, string key, string sign_type, string _input_charset);
        //public static string CreateLinkString(Dictionary<string, string> dicArray);
        // public static Dictionary<string, string> FilterPara(SortedDictionary<string, string> dicArrayPre);
        //public static void LogResult(string sWord);
        //public static string Sign(string prestr, string sign_type, string _input_charset);
        public static string BuildMysign(Dictionary<string, string> dicArray, string key, string sign_type, string _input_charset)
        {
            return Sign(CreateLinkString(dicArray) + key, sign_type, _input_charset);
        }
        public static string CreateLinkString(Dictionary<string, string> dicArray)
        {
            StringBuilder prestr = new StringBuilder();
            foreach (KeyValuePair<string, string> temp in dicArray)
            {
                prestr.Append(temp.Key + "=" + temp.Value + "&");
            }
            int nLen = prestr.Length;
            prestr.Remove(nLen - 1, 1);
            return prestr.ToString();
        }
        public static Dictionary<string, string> FilterPara(SortedDictionary<string, string> dicArrayPre)
        {
            Dictionary<string, string> dicArray = new Dictionary<string, string>();
            foreach (KeyValuePair<string, string> temp in dicArrayPre)
            {
                if ((((temp.Key.ToLower() != "sign") && (temp.Key.ToLower() != "sign_type")) && (temp.Value != "")) && (temp.Value != null))
                {
                    dicArray.Add(temp.Key.ToLower(), temp.Value);
                }
            }
            return dicArray;
        }
        public static void LogResult(string sWord)
        {
            StreamWriter fs = new StreamWriter(HttpContext.Current.Server.MapPath("log") + @"\" + DateTime.Now.ToString().Replace(":", "") + ".txt", false, Encoding.Default);
            fs.Write(sWord);
            fs.Close();
        }
        public static string Sign(string prestr, string sign_type, string _input_charset)
        {
            StringBuilder sb = new StringBuilder(0x20);
            if (sign_type.ToUpper() == "MD5")