如何使用.net构建微信服务号发送红包

//跳转微信登录页面 public ActionResult Index() { ViewBag.url = "https://open.weixin.qq.com/connect/oauth3/authorize?appid=" + {服务号appid} + "&redirect_uri=http%3A%2F%2F" + {微信重定向域名(填写程序域名,例如:www.xxxx.com)} + "%2F"+{程序控制器名,例如:Home}+"%2F"+{程序Action名,例如:RedirectWeChat}+"&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect"; return View(); } //获取accesstoken(访问微信接口需要) public static string accesstoken(string WeChatWxAppId, string WeChatWxAppSecret) { string strJson = HttpRequestUtil.RequestUrl(string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", WeChatWxAppId, WeChatWxAppSecret)); if (strJson.IndexOf("errcode") == -1) { return GetJsonValue(strJson, "access_token"); } else { return ""; } } //解析json public static string GetJsonValue(string jsonStr, string key) { string result = string.Empty; if (!string.IsNullOrEmpty(jsonStr)) { key = "\"" + key.Trim('"') + "\""; int index = jsonStr.IndexOf(key) + key.Length + 1; if (index > key.Length + 1) { //先截逗号，若是最后一个，截“｝”号，取最小值 int end = jsonStr.IndexOf(',', index); if (end == -1) { end = jsonStr.IndexOf('}', index); } result = jsonStr.Substring(index, end - index); result = result.Trim(new char[] { '"', ' ', '\'' }); //过滤引号或空格 } } return result; } //请求url public static string RequestUrl(string url, string method="post") { // 设置参数 HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest; CookieContainer cookieContainer = new CookieContainer(); request.CookieContainer = cookieContainer; request.AllowAutoRedirect = true; request.Method = method; request.ContentType = "text/html"; request.Headers.Add("charset", "utf-8"); //发送请求并获取相应回应数据 HttpWebResponse response = request.GetResponse() as HttpWebResponse; //直到request.GetResponse()程序才开始向目标网页发送Post请求 Stream responseStream = response.GetResponseStream(); StreamReader sr = new StreamReader(responseStream, Encoding.UTF8); //返回结果网页（html）代码 string content = sr.ReadToEnd(); return content; } //接收微信返回code //接收微信数据获取用户信息 public ActionResult RedirectWeChat(string code, string state) { if (string.IsNullOrEmpty(code)) { return Content("您拒绝了授权！"); } string access_token = accesstoken(微信AppId, 微信AppSecret); string st = "https://api.weixin.qq.com/sns/oauth3/access_token?appid=" + 微信AppId + "&secret=" + 微信AppSecret + "&code=" + code + "&grant_type=authorization_code"; string data = RequestUrl(st); //拿到用户openid string openid=GetJsonValue(data, "openid"); //获取用户其他信息 string url = "https://api.weixin.qq.com/cgi-bin/user/info?access_token=" + access_token + "&openid=" + openid + "&lang=zh_CN"; data = RequestUrl(url); string subscribe=GetJsonValue(data, "subscribe"); if (subscribe == "0") { ///未关注 return RedirectToAction(""); } return RedirectToAction(""); } //发送红包Action public ActionResult HB() { string openid = "";//用户openid string url = "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack"; string orderNo = 商户号 + DateTime.Now.ToString("yyyymmdd")+"随机10位数字";//商户订单号组成：mch_id+yyyymmdd+10位一天内不能重复的数字。 string Code = ""//32为随机字符串; string key="key=" + "";//支付密钥(在商户平台设置32为字符串) Dictionary<string, string> data = new Dictionary<string, string>(); data.Add("act_name", "");//活动名称 data.Add("client_ip", "192.168.1.1");//Ip地址 data.Add("mch_billno", orderNo);//商户订单号组成：mch_id+yyyymmdd+10位一天内不能重复的数字。 data.Add("mch_id", "");//商户号 data.Add("nonce_str", Code);//随机字符串 data.Add("re_openid", openid);//用户openid data.Add("remark", "");//备注 data.Add("send_name","");//商户名称 data.Add("total_amount", "100");//付款金额单位分 data.Add("total_num", "1");//红包发放总人数 data.Add("wishing", "恭喜发财");//红包祝福语 data.Add("wxappid", );//公众账号appid string xml = GetXML(data, key);//签名+拼接xml string str=PostWebRequests(url, xml);//微信返回xml err_code=SUCCESS 就是成功 return View(""); } //发送红包(MD5签名+拼接XML) public static string GetXML(Dictionary<string, string> data,string paykey) { string retStr; MD5CryptoServiceProvider m5 = new MD5CryptoServiceProvider(); var data1=from d in data orderby d.Key select d; string data2 = ""; string XML = "<xml>"; foreach (var item in data1) { //空值不参与签名 if (item.Value + "" != "") { data2 += item.Key +"="+ item.Value + "&"; } XML += "<" + item.Key + ">" + item.Value+""+ "</" + item.Key + ">"; } data2 += paykey; //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.UTF8.GetBytes(data2); } catch { inputBye = Encoding.GetEncoding("GB2312").GetBytes(data2); } outputBye = m5.ComputeHash(inputBye); retStr = System.BitConverter.ToString(outputBye); retStr = retStr.Replace("-", "").ToUpper(); XML += "<sign>" + retStr + "</sign>";//签名 XML += "</xml>"; return XML; } //发送红包请求Post方法 public static string PostWebRequests(string postUrl, string menuInfo) { string returnValue = string.Empty; try { Encoding encoding = Encoding.UTF8; byte[] bytes = encoding.GetBytes(menuInfo); string cert = @"E:\cdcert\apiclient_cert.p12";//支付证书路径 string password = "1212121";//支付证书密码 ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult); X509Certificate cer = new X509Certificate(cert, password, X509KeyStorageFlags.MachineKeySet); HttpWebRequest webrequest = (HttpWebRequest)HttpWebRequest.Create(postUrl); webrequest.ClientCertificates.Add(cer); webrequest.Method = "post"; webrequest.ContentLength = bytes.Length; webrequest.GetRequestStream().Write(bytes, 0, bytes.Length); HttpWebResponse webreponse = (HttpWebResponse)webrequest.GetResponse(); Stream stream = webreponse.GetResponseStream(); string resp = string.Empty; using (StreamReader reader = new StreamReader(stream)) { return reader.ReadToEnd(); } } catch (Exception ex) { return ""; } }

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