紅包功能簡(jiǎn)單介紹：

1、商戶調(diào)用接口時(shí)，通過指定發(fā)送對(duì)象以及發(fā)送金額的方式發(fā)放紅包，這樣的方式，允許商戶靈活的應(yīng)用于各種各樣豐富的活動(dòng)場(chǎng)景

2、領(lǐng)取到紅包后，用戶的資金直接進(jìn)入微信零錢，避免繁復(fù)的領(lǐng)獎(jiǎng)流程，帶給用戶微信支付原生的流暢體驗(yàn)

現(xiàn)金紅包官網(wǎng)文檔地址：https://pay.weixin.qq.com/wiki/doc/api/tools/cash_coupon.php?chapter=13_1

調(diào)用現(xiàn)金紅包接口需要使用到證書，請(qǐng)前往商戶平臺(tái)下載證書

官網(wǎng)有關(guān)詳細(xì)證書的介紹：https://pay.weixin.qq.com/wiki/doc/api/tools/cash_coupon.php?chapter=4_3

因?yàn)榘l(fā)送現(xiàn)金紅包是從商戶平臺(tái)余額扣款，所以商戶平臺(tái)的賬戶余額必須有充足的余額

下面是調(diào)用紅包接口詳細(xì)代碼：1、簽名的MD5加密類：

/// <summary>/// MD5UtilHelper 的摘要說明。/// </summary>public class MD5UtilHelper
{    public MD5UtilHelper()
    {        //
        // TODO: 在此處添加構(gòu)造函數(shù)邏輯
        //
    }    /// <summary>
            /// 獲取大寫的MD5簽名結(jié)果
    /// </summary>
    /// <param name="encypStr"></param>
    /// <param name="charset"></param>
    /// <returns></returns>
    public static string GetMD5(string encypStr, string charset)
    {        string retStr;
        MD5CryptoServiceProvider m5 = new MD5CryptoServiceProvider();        //創(chuàng)建md5對(duì)象
        byte[] inputBye;        byte[] outputBye;        //使用GB2312編碼方式把字符串轉(zhuǎn)化為字節(jié)數(shù)組．
        try
        {
            inputBye = Encoding.GetEncoding(charset).GetBytes(encypStr);
        }        catch (Exception ex)
        {
            inputBye = Encoding.GetEncoding("GB2312").GetBytes(encypStr);
        }
        outputBye = m5.ComputeHash(inputBye);

        retStr = System.BitConverter.ToString(outputBye);
        retStr = retStr.Replace("-", "").ToUpper();        return retStr;
    }
}

2、處理參數(shù)的類：

public class RequestHandler
    {        public RequestHandler(HttpContext httpContext)
        {
            Parameters = new Hashtable();            this.HttpContext = httpContext ?? HttpContext.Current;

        }        /// <summary>
        /// 密鑰
        /// </summary>
        private string Key;        protected HttpContext HttpContext;        /// <summary>
        /// 請(qǐng)求的參數(shù)
        /// </summary>
        protected Hashtable Parameters;        /// <summary>
        /// debug信息
        /// </summary>
        private string DebugInfo;        /// <summary>
        /// 初始化函數(shù)
        /// </summary>
        public virtual void Init()
        {
        }        /// <summary>
        /// 獲取debug信息
        /// </summary>
        /// <returns></returns>
        public String GetDebugInfo()
        {            return DebugInfo;
        }        /// <summary>
        /// 獲取密鑰
        /// </summary>
        /// <returns></returns>
        public string GetKey()
        {            return Key;
        }        /// <summary>
        /// 設(shè)置密鑰
        /// </summary>
        /// <param name="key"></param>
        public void SetKey(string key)
        {            this.Key = key;
        }        /// <summary>
        /// 設(shè)置參數(shù)值
        /// </summary>
        /// <param name="parameter"></param>
        /// <param name="parameterValue"></param>
        public void SetParameter(string parameter, string parameterValue)
        {            if (parameter != null && parameter != "")
            {                if (Parameters.Contains(parameter))
                {
                    Parameters.Remove(parameter);
                }

                Parameters.Add(parameter, parameterValue);
            }
        }        /// <summary>
        /// 創(chuàng)建md5摘要,規(guī)則是:按參數(shù)名稱a-z排序,遇到空值的參數(shù)不參加簽名
        /// </summary>
        /// <param name="key">參數(shù)名</param>
        /// <param name="value">參數(shù)值</param>
        /// key和value通常用于填充最后一組參數(shù)
        /// <returns></returns>
        public virtual string CreateMd5Sign(string key, string value)
        {
            StringBuilder sb = new StringBuilder();

            ArrayList akeys = new ArrayList(Parameters.Keys);
            akeys.Sort();            foreach (string k in akeys)
            {                string v = (string)Parameters[k];                if (null != v && "".CompareTo(v) != 0
                    && "sign".CompareTo(k) != 0 && "key".CompareTo(k) != 0)
                {
                    sb.Append(k + "=" + v + "&");
                }
            }

            sb.Append(key + "=" + value);            string sign = MD5UtilHelper.GetMD5(sb.ToString(), GetCharset()).ToUpper();            return sign;
        }        /// <summary>
        /// 輸出XML
        /// </summary>
        /// <returns></returns>
        public string ParseXML()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("<xml>");            foreach (string k in Parameters.Keys)
            {                string v = (string)Parameters[k];                if (Regex.IsMatch(v, @"^[0-9.]$"))
                {

                    sb.Append("<" + k + ">" + v + "</" + k + ">");
                }                else
                {
                    sb.Append("<" + k + "><![CDATA[" + v + "]]></" + k + ">");
                }

            }
            sb.Append("</xml>");            return sb.ToString();
        }        /// <summary>
        /// 設(shè)置debug信息
        /// </summary>
        /// <param name="debugInfo"></param>
        public void SetDebugInfo(String debugInfo)
        {            this.DebugInfo = debugInfo;
        }        public Hashtable GetAllParameters()
        {            return this.Parameters;
        }        protected virtual string GetCharset()
        {            return this.HttpContext.Request.ContentEncoding.BodyName;
        }
    }

3、調(diào)用現(xiàn)金紅包處理類：

 /// <summary>
 /// 企業(yè)號(hào)微信支付接口
 /// </summary>
 public static class TenPay
 {     #region 企業(yè)向用戶發(fā)紅包
     /// <summary>
     /// 用于企業(yè)向微信用戶個(gè)人發(fā)紅包
     /// 目前支持向指定微信用戶的openid個(gè)人發(fā)紅包
     /// </summary>
     /// <param name="certPassword">apiclient_cert.p12證書密碼即商戶號(hào)</param>
     /// <param name="data">微信支付需要post的xml數(shù)據(jù)</param>
     /// <param name="certPath">apiclient_cert.p12的證書物理位置(例如：E:\projects\文檔\微信商戶平臺(tái)證書\商戶平臺(tái)API證書</param>
     /// <param name="timeOut"></param>
     /// <returns></returns>
     public static string Sendredpack(string data, string certPassword,string certPath, int timeOut = Config.TIME_OUT)
     {         var urlFormat = "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack";         string cert = certPath;

         ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
         X509Certificate2 cer = new X509Certificate2(cert, certPassword, X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.MachineKeySet);         var formDataBytes = data == null ? new byte[0] : Encoding.UTF8.GetBytes(data);
         MemoryStream ms = new MemoryStream();
         ms.Write(formDataBytes, 0, formDataBytes.Length);
         ms.Seek(0, SeekOrigin.Begin);//設(shè)置指針讀取位置

         HttpWebRequest request = (HttpWebRequest)WebRequest.Create(urlFormat);
         request.ClientCertificates.Add(cer);
         request.Method = "POST";
         request.Timeout = timeOut;

         request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36";         #region 輸入二進(jìn)制流
         if (ms != null)
         {
             ms.Position = 0;             //直接寫入流
             Stream requestStream = request.GetRequestStream();             byte[] buffer = new byte[1024];             int bytesRead = 0;             while ((bytesRead = ms.Read(buffer, 0, buffer.Length)) != 0)
             {
                 requestStream.Write(buffer, 0, bytesRead);
             }
             ms.Close();//關(guān)閉文件訪問
         }         #endregion

         HttpWebResponse response = (HttpWebResponse)request.GetResponse();         using (Stream responseStream = response.GetResponseStream())
         {             using (StreamReader myStreamReader = new StreamReader(responseStream, Encoding.GetEncoding("utf-8")))
             {                 string retString = myStreamReader.ReadToEnd();                 return retString;
             }
         }
     }     private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
     {         if (errors == SslPolicyErrors.None)             return true;         return false;
     }     #endregion

 }

4、調(diào)用現(xiàn)金紅包接口

#region 發(fā)送紅包bool fals = false;   //記錄發(fā)送紅包是否成功string xmlResult = null;  //現(xiàn)金紅包接口返回的xmlstring certPath = null;  //證書在服務(wù)器的物理位置string data = null;  //調(diào)用現(xiàn)金紅包接口需要的數(shù)據(jù)try
{
    //創(chuàng)建支付應(yīng)答對(duì)象
    RequestHandler packageReqHandler = new RequestHandler(null);
    //初始化
    packageReqHandler.Init();
    string nonceStr = TenPayV3Util.GetNoncestr();  //時(shí)間戳
    //設(shè)置package訂單參數(shù)
    packageReqHandler.SetParameter("nonce_str", nonceStr);    //隨機(jī)字符串，不長(zhǎng)于32位
    packageReqHandler.SetParameter("mch_billno", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_MchId"] + model.JournalNumber);//商戶訂單號(hào)（每個(gè)訂單號(hào)必須唯一）組成：mch_id+yyyymmdd+10位一天內(nèi)不能重復(fù)的數(shù)字。接口根據(jù)商戶訂單號(hào)支持重入，如出現(xiàn)超時(shí)可再調(diào)用。
    packageReqHandler.SetParameter("mch_id", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_MchId"]);  //微信支付分配的商戶號(hào)
    packageReqHandler.SetParameter("wxappid", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_AppId"]);//微信分配的公眾賬號(hào)ID（企業(yè)號(hào)corpid即為此appId）。接口傳入的所有appid應(yīng)該為公眾號(hào)的appid（在mp.weixin.qq.com申請(qǐng)的），不能為APP的appid（在open.weixin.qq.com申請(qǐng)的）。 
    packageReqHandler.SetParameter("send_name", "測(cè)試");//商戶名稱
    packageReqHandler.SetParameter("re_openid", model.BankCard);  //用戶openid  接受紅包的用戶用戶在wxappid下的openid
    packageReqHandler.SetParameter("total_amount", Convert.ToInt32((decimal)(model.Amount * 100M)).ToString(CultureInfo.InvariantCulture));  //付款金額 單位分
    packageReqHandler.SetParameter("total_num", "1");  //紅包發(fā)放總?cè)藬?shù)
    packageReqHandler.SetParameter("wishing", "測(cè)試紅包");  //紅包祝福語(yǔ)
    packageReqHandler.SetParameter("client_ip", HttpContext.Current.Request.UserHostAddress);//Ip地址
    packageReqHandler.SetParameter("act_name", "測(cè)試紅包");//活動(dòng)名稱
    packageReqHandler.SetParameter("remark", "測(cè)試紅包");     //備注
    string sign = packageReqHandler.CreateMd5Sign("key", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_Key"]);
    packageReqHandler.SetParameter("sign", sign);                        //簽名
    data = packageReqHandler.ParseXML();
    certPath = Server.MapPath("~/") + System.Configuration.ConfigurationManager.AppSettings["certPath"];
    xmlResult = Sendredpack(data, System.Configuration.ConfigurationManager.AppSettings["TenPayV3_MchId"],certPath);
    var res = XDocument.Parse(xmlResult);
    string return_code = res.Element("xml").Element("return_code").Value;
    if ("SUCCESS".Equals(return_code))
    {
        string result_code = res.Element("xml").Element("result_code").Value;
        if ("SUCCESS".Equals(result_code))
        {
            fals = true;
        }
    }
}
catch (Exception exception)
{
}#endregion

注意：證書所在文件夾權(quán)限，IIS必須有權(quán)限對(duì)該文件夾操作的權(quán)限。

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