C#.net支付宝接口

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;

public partial class pay : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Encoding gb2312 = Encoding.GetEncoding("gb2312");
        Response.ContentEncoding = gb2312;
        Request.ContentEncoding = gb2312;
    }

    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
    {
        if (Request.Cookies[FormsAuthentication.FormsCookieName] != null)
        {
            Vlike_DB_read a = new Vlike_DB_read();
            string zfb_ddh = a.get_zfb_id(Membership.GetUser().UserName, Convert.ToInt32(DropDownList1.SelectedValue));
            Response.Redirect(img("0001", "包月", "影视包月  10元/月", zfb_ddh, "10.00", Membership.GetUser().UserName.ToUpper(), DropDownList1.SelectedValue));
        }
        else
        {
            Response.Write("");
        }
    }

    private string img(string strcmd, string strSub, string strSubinfo, string strid, string strMoney, string strUser, string strNum)
    {
        string strsellerEmail = "341081@qq.com";          //卖家支付宝帐号
        string strAc = "";        　　　　//卖家支付宝安全校验码
        string INTERFACE_URL = "https://www.alipay.com/payto:";
        string strCmd = strcmd;           //命令字
        string strSubject = strSub;       //商品名
        string strBody = strSubinfo;      //商品描述
        string strOrder_no = strid;       //商户订单号
        string strPrice = strMoney;       //商品单价 0.01～50000.00
        string rurl = "http://";          //商品展示网址
        string strType = "2";             //type支付类型    1：商品购买2：服务购买3：网络拍卖4：捐赠
        string strNumber = strNum;        //购买数量
        string strTransport = "3";        //发货方式        1：平邮2：快递3：虚拟物品
        string strOrdinary_fee = "";      //平邮运费
        string strExpress_fee = "";       //快递运费
        string strReadOnly = "true";      //交易信息是否只读
        string strBuyer_msg = "";         //买家给卖家的留言

        string strBuyer = "";             //买家EMAIL
        string strBuyer_name = strUser;   //买家姓名
        string strBuyer_address = "";     //买家地址
        string strBuyer_zipcode = "";     //买家邮编
        string strBuyer_tel = "";         //买家电话号码
        string strBuyer_mobile = "";      //买家手机号码
        string strPartner = "";           //合作伙伴ID    保留字段

        return CreatUrl(strsellerEmail, strAc, INTERFACE_URL, strCmd, strSubject, strBody,
            strOrder_no, strPrice, rurl, strType, strNumber, strTransport,
            strOrdinary_fee, strExpress_fee, strReadOnly, strBuyer_msg, strBuyer,
            strBuyer_name, strBuyer_address, strBuyer_zipcode, strBuyer_tel,
            strBuyer_mobile, strPartner);
    }
    private string CreatUrl(
        string strsellerEmail,
        string strAc,
        string INTERFACE_URL,
        string strCmd,
        string strSubject,
        string strBody,
        string strOrder_no,
        string strPrice,
        string rurl,
        string strType,
        string strNumber,
        string strTransport,
        string strOrdinary_fee,
        string strExpress_fee,
        string strReadOnly,
        string strBuyer_msg,
        string strBuyer,
        string strBuyer_name,
        string strBuyer_address,
        string strBuyer_zipcode,
        string strBuyer_tel,
        string strBuyer_mobile,
        string strPartner)
    {   //以下参数值不能留空

        string str2CreateAc = "";
        str2CreateAc += "cmd" + strCmd + "subject" + strSubject;
        str2CreateAc += "body" + strBody;
        str2CreateAc += "order_no" + strOrder_no;
        str2CreateAc += "price" + strPrice;
        str2CreateAc += "url" + rurl;
        str2CreateAc += "type" + strType;
        str2CreateAc += "number" + strNumber;
        str2CreateAc += "transport" + strTransport;
        str2CreateAc += "ordinary_fee" + strOrdinary_fee;
        str2CreateAc += "express_fee" + strExpress_fee;
        str2CreateAc += "readonly" + strReadOnly;
        str2CreateAc += "buyer_msg" + strBuyer_msg;
        str2CreateAc += "seller" + strsellerEmail;
        str2CreateAc += "buyer" + strBuyer;
        str2CreateAc += "buyer_name" + strBuyer_name;
        str2CreateAc += "buyer_address" + strBuyer_address;
        str2CreateAc += "buyer_zipcode" + strBuyer_zipcode;
        str2CreateAc += "buyer_tel" + strBuyer_tel;
        str2CreateAc += "buyer_mobile" + strBuyer_mobile;
        str2CreateAc += "partner" + strPartner;
        str2CreateAc += strAc;


        string acCode = GetMD5(str2CreateAc);

        string parameter = "";

        parameter += INTERFACE_URL + strsellerEmail + "?cmd=" + strCmd;
        parameter += "&subject=" + Server.UrlEncode(strSubject);
        parameter += "&body=" + Server.UrlEncode(strBody);
        parameter += "&order_no=" + strOrder_no;
        parameter += "&url=" + rurl;
        parameter += "&price=" + strPrice;
        parameter += "&type=" + strType;
        parameter += "&number=" + strNumber;
        parameter += "&transport=" + strTransport;
        parameter += "&ordinary_fee=" + strOrdinary_fee;
        parameter += "&express_fee=" + strExpress_fee;
        parameter += "&readonly=" + strReadOnly;
        parameter += "&buyer_msg=" + strBuyer_msg;
        parameter += "&buyer=" + strBuyer;
        parameter += "&buyer_name=" + Server.UrlEncode(strBuyer_name);
        parameter += "&buyer_address=" + strBuyer_address;
        parameter += "&buyer_zipcode=" + strBuyer_zipcode;
        parameter += "&buyer_tel=" + strBuyer_tel;
        parameter += "&buyer_mobile=" + strBuyer_mobile;
        parameter += "&partner=" + strPartner;
        parameter += "&ac=" + acCode;

        return parameter;
    }

    private static string GetMD5(string s)
    {
        System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
        byte[] t = md5.ComputeHash(System.Text.Encoding.GetEncoding("gb2312").GetBytes(s));
        System.Text.StringBuilder sb = new System.Text.StringBuilder(32);
        for (int i = 0; i < t.Length; i++)
        {
            sb.Append(t[i].ToString("x").PadLeft(2, '0'));
        }
        return sb.ToString();
    }
}