第三方app抽奖发送微信红包实现

1、控制器方法：

 private string SendRedPackge(string OpenId, int Amount, string LuckyCode)
        {
            Models.PayWeiXinModel pModel = new Models.PayWeiXinModel();
            Html_Tools.Common.PayForWeiXinHelp PayHelp = new Html_Tools.Common.PayForWeiXinHelp();
            string result = string.Empty;

            //接叐收红包的用户 用户在wxappid下的openid
            pModel.re_openid = OpenId;//"oFIYdszuDXVqVCtwZ-yIcbIS262k";
            //付款金额，单位分
            pModel.total_amount = Amount;
            //最小红包金额，单位分
            pModel.min_value = Amount;
            //最大红包金额，单位分
            pModel.max_value = Amount;
            //商户订单号
            pModel.mch_billno = LuckyCode;
            //调用方法
            string postData = PayHelp.DoDataForPayWeiXin(pModel);
            //发送
            result = PayHelp.PayForWeiXin(postData);
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(result);
            var rmodel=new Models.WeiXinRedPackgeResultModel();
            Html_Tools.Common.WeiXinMPHelper.FillEntityFromXml(rmodel, doc);
            if (rmodel.result_code.Equals("SUCCESS"))
            {
                return "红包已成功发放，请及时领取";
            }
            else
            {
                Html_Tools.Common.ToolsHelper.WriteLog(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + " 发送红包异常信息：" + result + "\r\n");
　　　　　　　　　　pBll.DrawPrize(OpenId, LuckyCode, false);
                return "不好意思，红包发送出错啦。";
            }
        }

2、工具类PayForWeiXinHelp方法：

 public class PayForWeiXinHelp
    {

        /// <summary>
        /// 调用微信支付接口前处理数据，包括sign验证等
        /// </summary>
        /// <param name="payForWeiXin"></param>
        /// <returns></returns>
        public string DoDataForPayWeiXin(Models.PayWeiXinModel payForWeiXin)
        {
            #region 处理nonce_str随机字符串，不长于 32 位（本程序生成长度为16位的）
            string str = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            payForWeiXin.nonce_str = RandomStr(str, );
            #endregion

            #region 商户信息从config文件中读取
            //商户支付密钥key
            string key = WeiXinConfig.key;
            //商户号
            payForWeiXin.mch_id = WeiXinConfig.mch_id;
            //商户 appid
            payForWeiXin.wxappid = WeiXinConfig.wxappid;
            //提供方名称
            payForWeiXin.nick_name = WeiXinConfig.nick_name;
            //红包収送者名称
            payForWeiXin.send_name = WeiXinConfig.send_name;
            //红包収放总人数
            payForWeiXin.total_num = int.Parse(WeiXinConfig.total_num);
            //红包祝福诧
            payForWeiXin.wishing = WeiXinConfig.wishing;
            //活劢名称
            payForWeiXin.act_name = WeiXinConfig.act_name;
            payForWeiXin.act_id = "act_id";
            //备注信息
            payForWeiXin.remark = WeiXinConfig.remark;
            //商户logo的url
            payForWeiXin.logo_imgurl = WeiXinConfig.logo_imgurl;
            //分享文案
            payForWeiXin.share_content = WeiXinConfig.share_content;
            //分享链接
            payForWeiXin.share_url = WeiXinConfig.share_url;
            //分享的图片url
            payForWeiXin.share_imgurl = WeiXinConfig.share_imgurl;
            //调用接口的机器 Ip 地址
            payForWeiXin.client_ip = WeiXinConfig.client_ip;
            #endregion

            #region 订单信息
            //生成订单号组成： mch_id+yyyymmdd+10 位一天内不能重复的数字
            //生成10位不重复的数字
            payForWeiXin.mch_billno = payForWeiXin.mch_billno+System.DateTime.Now.ToString("yyyyMMddHHmmss");
            #endregion

            string postData = @"<xml>
                                 <mch_billno><![CDATA[{0}]]></mch_billno>
                                 <mch_id><![CDATA[{1}]]></mch_id>
                                 <wxappid><![CDATA[{2}]]></wxappid>
                                 <send_name><![CDATA[{3}]]></send_name>
                                 <re_openid><![CDATA[{4}]]></re_openid>
                                 <total_amount><![CDATA[{5}]]></total_amount>
                                 <total_num><![CDATA[{6}]]></total_num>
                                 <wishing><![CDATA[{7}]]></wishing>
                                 <client_ip><![CDATA[{8}]]></client_ip>
                                 <act_name><![CDATA[{9}]]></act_name>
                                 <remark><![CDATA[{10}]]></remark>
                                 <nonce_str><![CDATA[{11}]]></nonce_str>";
            postData = string.Format(postData,
                                            payForWeiXin.mch_billno,
                                            payForWeiXin.mch_id,
                                            payForWeiXin.wxappid,
                                            payForWeiXin.send_name,
                                            payForWeiXin.re_openid,
                                            payForWeiXin.total_amount,
                                            payForWeiXin.total_num,
                                            payForWeiXin.wishing,
                                            payForWeiXin.client_ip,
                                            payForWeiXin.act_name,
                                            payForWeiXin.remark,
                                            payForWeiXin.nonce_str
                                );

            //原始传入参数
            string[] signTemp = { "mch_billno=" + payForWeiXin.mch_billno, "mch_id=" + payForWeiXin.mch_id, "wxappid=" + payForWeiXin.wxappid, "send_name=" + payForWeiXin.send_name, "re_openid=" + payForWeiXin.re_openid, "total_amount=" + payForWeiXin.total_amount, "total_num=" + payForWeiXin.total_num, "wishing=" + payForWeiXin.wishing, "client_ip=" + payForWeiXin.client_ip, "act_name=" + payForWeiXin.act_name, "remark=" + payForWeiXin.remark, "nonce_str=" + payForWeiXin.nonce_str };

            List<string> signList = signTemp.ToList();

            #region 处理支付签名
            //对signList按照ASCII码从小到大的顺序排序
            signList.Sort();

            string signOld = string.Empty;
            //string payForWeiXinOld = string.Empty;
            int i = ;
            foreach (string temp in signList)
            {
                signOld += temp + "&";
                i++;
            }
            //signOld = signOld.Substring(0, signOld.Length - 1);
            //拼接Key
            signOld += "key=" + key;
            //处理支付签名
            payForWeiXin.sign = GetMD5Hash(signOld).ToUpper();
            #endregion
            postData += "<sign><![CDATA[{0}]]></sign></xml>";
            postData = string.Format(postData, payForWeiXin.sign);
            return postData;
        }

        /// <summary>
        /// 调用微信支付接口
        /// </summary>
        /// <param name="payForWeiXin"></param>
        /// <returns></returns>
        public string PayForWeiXin(string postData)
        {
            string result = string.Empty;
            try
            {
                result = PostPage("https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack", postData);
            }
            catch (Exception ex)
            {

            }
            return result;
        }

        /// <summary>
        /// post微信请求
        /// </summary>
        /// <param name="posturl"></param>
        /// <param name="postData"></param>
        /// <returns></returns>
        public string PostPage(string posturl, string postData)
        {
            Stream outstream = null;
            Stream instream = null;
            StreamReader sr = null;
            HttpWebResponse response = null;
            HttpWebRequest request = null;
            Encoding encoding = Encoding.UTF8;
            byte[] data = encoding.GetBytes(postData);
            // 准备请求...
            try
            {
                //CerPath证书路径
                string certPath = WeiXinConfig.certPath;
                //证书密码
                string password = WeiXinConfig.password;
                X509Certificate2 cert = new System.Security.Cryptography.X509Certificates.X509Certificate2(certPath, password, X509KeyStorageFlags.MachineKeySet);

                // 设置参数
                request = WebRequest.Create(posturl) as HttpWebRequest;
                CookieContainer cookieContainer = new CookieContainer();
                request.CookieContainer = cookieContainer;
                request.AllowAutoRedirect = true;
                request.Method = "POST";
                request.ContentType = "text/xml";
                request.ContentLength = data.Length;
                request.ClientCertificates.Add(cert);
                outstream = request.GetRequestStream();
                outstream.Write(data, , data.Length);
                outstream.Close();
                //发送请求并获取相应回应数据
                response = request.GetResponse() as HttpWebResponse;
                //直到request.GetResponse()程序才开始向目标网页发送Post请求
                instream = response.GetResponseStream();
                sr = new StreamReader(instream, encoding);
                //返回结果网页（html）代码
                string content = sr.ReadToEnd();
                string err = string.Empty;
                return content;

            }
            catch (Exception ex)
            {
                string err = ex.Message;
                return string.Empty;
            }
        }

        public string RandomStr(string str, int Length)
        {
            string result = string.Empty;
            Random rd = new Random();
            for (int i = ; i < Length; i++)
            {
                result += str[rd.Next(str.Length)];
            }
            return result;
        }

        /// <summary>
        /// Md5加密
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static String Encrypt(String s)
        {
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] bytes = System.Text.Encoding.UTF8.GetBytes(s);
            bytes = md5.ComputeHash(bytes);
            md5.Clear();
            string ret = "";
            for (int i = ; i < bytes.Length; i++)
            {
                ret += Convert.ToString(bytes[i], ).PadLeft(, '');
            }
            return ret.PadLeft(, '');
        }

        public static string GetMD5Hash(string value)
        {
            var md5 = MD5.Create();
            var bs = md5.ComputeHash(Encoding.UTF8.GetBytes(value));
            var sb = new StringBuilder();
            foreach (byte b in bs)
            {
                sb.Append(b.ToString("x2"));
            }
            //所有字符转为大写
            return sb.ToString();
        }

 public static void FillEntityFromXml<T>(this T entity, System.Xml.XmlDocument doc)
        {
            Dictionary<string, string> Dic = new Dictionary<string, string>();
            System.Xml.XmlNodeList nodelist = doc.DocumentElement.ChildNodes;
            if (nodelist.Count > )
            {
                Type t = entity.GetType();
                foreach (System.Xml.XmlElement el in nodelist)//读元素值
                {
                    System.Reflection.PropertyInfo proInfo = t.GetProperty(el.Name);//访问Obj的类型的属性Value的属性信息（propertyInfo）
                    if (proInfo != null)
                    {
                        string str2 = proInfo.PropertyType.Name;
                        if (str2 == null)
                        {
                            goto Label_018A;
                        }
                        if (!(str2 == "DateTime"))
                        {
                            if (str2 == "Boolean")
                            {
                                goto Label_00E9;
                            }
                            if (str2 == "Int64")
                            {
                                goto Label_0134;
                            }
                            goto Label_018A;
                        }
                        proInfo.SetValue(entity, new DateTime(long.Parse(el.InnerText)), null);
                    }
                    continue;
                Label_00E9:
                    proInfo.SetValue(entity, el.InnerText == "", null);
                        continue;
                Label_0134:
                    proInfo.SetValue(entity, long.Parse(el.InnerText), null);
                    continue;
                Label_018A:
                    proInfo.SetValue(entity, el.InnerText, null);
                }
            }
        }

    }