C#公众号开发之给用户发红包

红包功能简单介绍：

1、商户调用接口时，通过指定发送对象以及发送金额的方式发放红包，这样的方式，允许商户灵活的应用于各种各样丰富的活动场景

2、领取到红包后，用户的资金直接进入微信零钱，避免繁复的领奖流程，带给用户微信支付原生的流畅体验

现金红包官网文档地址

调用现金红包接口需要使用到证书，请前往商户平台下载证书

官网有关详细证书的介绍，点击查看

因为发送现金红包是从商户平台余额扣款，所以商户平台的账户余额必须有充足的余额

下面是调用红包接口详细代码：

1、签名的MD5加密类：

/// <summary>
/// MD5UtilHelper 的摘要说明。
/// </summary>
public class MD5UtilHelper
{
  public MD5UtilHelper()
  {
    //
    // TODO: 在此处添加构造函数逻辑
    //
  }

  /// <summary>
      /// 获取大写的MD5签名结果
  /// </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();

    //创建md5对象
    byte[] inputBye;
    byte[] outputBye;

    //使用GB2312编码方式把字符串转化为字节数组．
    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、处理参数的类：

public class RequestHandler
  {

    public RequestHandler(HttpContext httpContext)
    {
      Parameters = new Hashtable();

      this.HttpContext = httpContext ?? HttpContext.Current;

    }
    /// <summary>
    /// 密钥
    /// </summary>
    private string Key;

    protected HttpContext HttpContext;

    /// <summary>
    /// 请求的参数
    /// </summary>
    protected Hashtable Parameters;

    /// <summary>
    /// debug信息
    /// </summary>
    private string DebugInfo;

    /// <summary>
    /// 初始化函数
    /// </summary>
    public virtual void Init()
    {
    }
    /// <summary>
    /// 获取debug信息
    /// </summary>
    /// <returns></returns>
    public String GetDebugInfo()
    {
      return DebugInfo;
    }
    /// <summary>
    /// 获取密钥
    /// </summary>
    /// <returns></returns>
    public string GetKey()
    {
      return Key;
    }
    /// <summary>
    /// 设置密钥
    /// </summary>
    /// <param name="key"></param>
    public void SetKey(string key)
    {
      this.Key = key;
    }

    /// <summary>
    /// 设置参数值
    /// </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>
    /// 创建md5摘要,规则是:按参数名称a-z排序,遇到空值的参数不参加签名
    /// </summary>
    /// <param name="key">参数名</param>
    /// <param name="value">参数值</param>
    /// key和value通常用于填充最后一组参数
    /// <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>
    /// 输出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>
    /// 设置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、调用现金红包处理类：

 /// <summary>
 /// 企业号微信支付接口
 /// </summary>
 public static class TenPay
 {

   #region 企业向用户发红包
   /// <summary>
   /// 用于企业向微信用户个人发红包
   /// 目前支持向指定微信用户的openid个人发红包
   /// </summary>
   /// <param name="certPassword">apiclient_cert.p12证书密码即商户号</param>
   /// <param name="data">微信支付需要post的xml数据</param>
   /// <param name="certPath">apiclient_cert.p12的证书物理位置(例如：E:\projects\文档\微信商户平台证书\商户平台API证书</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);//设置指针读取位置

     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 输入二进制流
     if (ms != null)
     {
       ms.Position = 0;
       //直接写入流
       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();//关闭文件访问
     }
     #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、调用现金红包接口

#region 发送红包
bool fals = false;  //记录发送红包是否成功
string xmlResult = null; //现金红包接口返回的xml
string certPath = null; //证书在服务器的物理位置
string data = null; //调用现金红包接口需要的数据
try
{
  //创建支付应答对象
  RequestHandler packageReqHandler = new RequestHandler(null);
  //初始化
  packageReqHandler.Init();
  string nonceStr = TenPayV3Util.GetNoncestr(); //时间戳
  //设置package订单参数
  packageReqHandler.SetParameter("nonce_str", nonceStr);  //随机字符串，不长于32位
  packageReqHandler.SetParameter("mch_billno", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_MchId"] + model.JournalNumber);//商户订单号（每个订单号必须唯一）组成：mch_id+yyyymmdd+10位一天内不能重复的数字。接口根据商户订单号支持重入，如出现超时可再调用。
  packageReqHandler.SetParameter("mch_id", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_MchId"]); //微信支付分配的商户号
  packageReqHandler.SetParameter("wxappid", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_AppId"]);//微信分配的公众账号ID（企业号corpid即为此appId）。接口传入的所有appid应该为公众号的appid（在mp.weixin.qq.com申请的），不能为APP的appid（在open.weixin.qq.com申请的）。
  packageReqHandler.SetParameter("send_name", "测试");//商户名称
  packageReqHandler.SetParameter("re_openid", model.BankCard); //用户openid 接受红包的用户用户在wxappid下的openid
  packageReqHandler.SetParameter("total_amount", Convert.ToInt32((decimal)(model.Amount * 100M)).ToString(CultureInfo.InvariantCulture)); //付款金额 单位分
  packageReqHandler.SetParameter("total_num", "1"); //红包发放总人数
  packageReqHandler.SetParameter("wishing", "测试红包"); //红包祝福语
  packageReqHandler.SetParameter("client_ip", HttpContext.Current.Request.UserHostAddress);//Ip地址
  packageReqHandler.SetParameter("act_name", "测试红包");//活动名称
  packageReqHandler.SetParameter("remark", "测试红包");   //备注
  string sign = packageReqHandler.CreateMd5Sign("key", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_Key"]);
  packageReqHandler.SetParameter("sign", sign);            //签名
  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：证书所在文件夹权限，IIS必须有权限对该文件夹操作的权限。

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