支付宝工具类

using System;

using System.Collections.Generic;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

using System.Web;

namespace ZK_ECommerce.Shop.pay.alipay

{

  public class AliPay

  {

    public static string GetMD5(string s, string _input_charset)

    {

      /// <summary>

      /// 与ASP兼容的MD5加密算法

      /// </summary>

      MD5 md5 = new MD5CryptoServiceProvider();

      byte[] t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s));

      StringBuilder sb = new StringBuilder(32);

      for (int i = 0; i < t.Length; i++)

      {

        sb.Append(t[i].ToString("x").PadLeft(2, '0'));

      }

      return sb.ToString();

    }

    public static string[] BubbleSort(string[] r)

    {

      /// <summary>

      /// 冒泡排序法

      /// </summary>

      int i, j; //交换标志 

      string temp;

      bool exchange;

      for (i = 0; i < r.Length; i++) //最多做R.Length-1趟排序 

      {

        exchange = false; //本趟排序开始前，交换标志应为假

        for (j = r.Length - 2; j >= i; j--)

        {

          if (System.String.CompareOrdinal(r[j + 1], r[j]) < 0)　//交换条件

          {

            temp = r[j + 1];

            r[j + 1] = r[j];

            r[j] = temp;

            exchange = true; //发生了交换，故将交换标志置为真 

          }

        }

        if (!exchange) //本趟排序未发生交换，提前终止算法 

        {

          break;

        }

      }

      return r;

    }

    public string CreatUrl(

      string gateway,

      string service,

      string partner,

      string sign_type,

      string out_trade_no,

      string subject,

      string body,

      string payment_type,

      string total_fee,

      string show_url,

      string seller_email,

      string key,

      string return_url,

      string _input_charset,

      string notify_url,

      string extra_common_param = ""

      )

    {

      return CreatUrl(

      gateway,

      service,

      partner,

      sign_type,

      out_trade_no,

      subject,

      body,

      payment_type,

      total_fee,

      show_url,

      seller_email,

      key,

      return_url,

      _input_charset,

      notify_url,

      "",

      extra_common_param);

    }

    public string CreatUrl(

      string gateway,

      string service,

      string partner,

      string sign_type,

      string out_trade_no,

      string subject,

      string body,

      string payment_type,

      string total_fee,

      string show_url,

      string seller_email,

      string key,

      string return_url,

      string _input_charset,

      string notify_url,

      string token,

      string extra_common_param = ""

      )

    {

      /// <summary>

      ///2015年11月17日14:08:00

      /// </summary>

      int i;

      string[] Oristr;

      //构造数组；

      if (!string.IsNullOrEmpty(token))

      {

        if (extra_common_param == "COD2MOTOPAY")

        {

          Oristr = new[]{ 

          "service="+service, 

          "partner=" + partner, 

          "subject=" + subject, 

          "body=" + body, 

          "out_trade_no=" + out_trade_no, 

          "total_fee=" + total_fee, 

          "show_url=" + show_url, 

          "payment_type=" + payment_type, 

          "seller_email=" + seller_email, 

          "notify_url=" + notify_url,

          "_input_charset="+_input_charset,     

          "return_url=" + return_url,

          "token="+token,

          "extra_common_param="+extra_common_param

          };

        }

        else

        {

          Oristr = new[]{ 

          "service="+service, 

          "partner=" + partner, 

          "subject=" + subject, 

          "body=" + body, 

          "out_trade_no=" + out_trade_no, 

          "total_fee=" +total_fee, 

          "show_url=" + show_url, 

          "payment_type=" + payment_type, 

          "seller_email=" + seller_email, 

          "notify_url=" + notify_url,

          "_input_charset="+_input_charset,     

          "return_url=" + return_url,

          "token="+token

          };

        }

      }

      else

      {

        if (extra_common_param == "COD2MOTOPAY")

        {

          Oristr = new[]{ 

          "service="+service, 

          "partner=" + partner, 

          "subject=" + subject, 

          "body=" + body, 

          "out_trade_no=" + out_trade_no, 

          "total_fee="+total_fee, 

          "show_url=" + show_url, 

          "payment_type=" + payment_type, 

          "seller_email=" + seller_email, 

          "notify_url=" + notify_url,

          "_input_charset="+_input_charset,     

          "return_url=" + return_url,

          "extra_common_param="+extra_common_param

          };

        }

        else

        {

          Oristr = new[]{ 

          "service="+service, 

          "partner=" + partner, 

          "subject=" + subject, 

          "body=" + body, 

          "out_trade_no=" + out_trade_no, 

          "total_fee=" + total_fee, 

          "show_url=" + show_url, 

          "payment_type=" + payment_type, 

          "seller_email=" + seller_email, 

          "notify_url=" + notify_url,

          "_input_charset="+_input_charset,     

          "return_url=" + return_url

          };

        }

      }

      //进行排序；

      string[] Sortedstr = BubbleSort(Oristr);

      //构造待md5摘要字符串 ；

      StringBuilder prestr = new StringBuilder();

      for (i = 0; i < Sortedstr.Length; i++)

      {

        if (i == Sortedstr.Length - 1)

        {

          prestr.Append(Sortedstr[i]);

        }

        else

        {

          prestr.Append(Sortedstr[i] + "&");

        }

      }

      prestr.Append(key);

      //生成Md5摘要；

      string sign = GetMD5(prestr.ToString(), _input_charset);

      //构造支付Url；

      char[] delimiterChars = { '=' };

      StringBuilder parameter = new StringBuilder();

      parameter.Append(gateway);

      for (i = 0; i < Sortedstr.Length; i++)

      {

        parameter.Append(Sortedstr[i].Split(delimiterChars)[0] + "=" + HttpUtility.UrlEncode(Sortedstr[i].Split(delimiterChars)[1]) + "&");

      }

      parameter.Append("sign=" + sign + "&sign_type=" + sign_type);

      //返回支付Url；

      return parameter.ToString();

    }

    public string CreatUrl_MissPayments(

                string gateway,

                string service,

                string partner,

                string sign_type,

                string out_trade_no,

                string key,

                string _input_charset

     )

    {

      /// <summary>

      /// created by sunzhizhi 2006.5.21,sunzhizhi@msn.com。

      /// </summary>

      int i;

      //构造数组；

      string[] Oristr ={ 

        "service="+service, 

        "partner=" + partner,

        "out_trade_no=" + out_trade_no,   

        "_input_charset="+_input_charset     

        };

      //进行排序；

      string[] Sortedstr = BubbleSort(Oristr);

      //构造待md5摘要字符串 ；

      StringBuilder prestr = new StringBuilder();

      for (i = 0; i < Sortedstr.Length; i++)

      {

        if (i == Sortedstr.Length - 1)

        {

          prestr.Append(Sortedstr[i]);

        }

        else

        {

          prestr.Append(Sortedstr[i] + "&");

        }

      }

      prestr.Append(key);

      //生成Md5摘要；

      string sign = GetMD5(prestr.ToString(), _input_charset);

      //构造支付Url；

      char[] delimiterChars = { '=' };

      StringBuilder parameter = new StringBuilder();

      parameter.Append(gateway);

      for (i = 0; i < Sortedstr.Length; i++)

      {

        parameter.Append(Sortedstr[i].Split(delimiterChars)[0] + "=" + HttpUtility.UrlEncode(Sortedstr[i].Split(delimiterChars)[1]) + "&");

      }

      parameter.Append("sign=" + sign + "&sign_type=" + sign_type);

      //返回支付Url；

      return parameter.ToString();

    }

    public static string GetTranSign(string TranData)

    {

      if (string.IsNullOrWhiteSpace(TranData))

        return null;

      string sign = GetMD5(TranData + "alskdjfaow;fjel;asdjf", "utf-8");

      return sign;

    }

  }

}