C#公眾號(hào)開(kāi)發(fā)之給用戶發(fā)紅包

來(lái)源：本站原創(chuàng)|時(shí)間：2020-01-10|欄目：C#教程|點(diǎn)擊：次

紅包功能簡(jiǎn)單介紹：

1、商戶調(diào)用接口時(shí)，通過(guò)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

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，點(diǎn)擊查看

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(shuō)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(wèn)
     }
     #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xml
string 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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