C# 企业微信：开启消息接受&接收消息&推送消息

前言：微信吧！接触的人都会100%各种踩坑，就算同样东西去年做过，今年来一样踩坑，因为太多你稍微不记得一点点的细节就能让你研究N久。为此，我要把这个过程详细的记录下来。

一、开启消息接受

 1.拿到企业corpId，应用的Token，EncodingAESKey

2.这界面先别关，拿到 Token，EncodingAESKey后，建个接口

鉴于公司系统的架构类型，我这里创建的是一个aspx文件，代码如下：

public partial class request_WxMsgApi : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //开启消息接受
        if (Request.HttpMethod.ToUpper() == "GET")
        {
            string signature = HttpContext.Current.Request.QueryString["msg_signature"];
            string timestamp = HttpContext.Current.Request.QueryString["timestamp"];
            string nonce = HttpContext.Current.Request.QueryString["nonce"];
            string echostr = HttpContext.Current.Request.QueryString["echostr"];
            string decryptEchoString = "";
            WXBizMsgCrypt wxcpt = new WXBizMsgCrypt("your token", "your EncodingAESKey", System.Configuration.ConfigurationManager.AppSettings["Corpid"]);
            int ret = wxcpt.VerifyURL(signature, timestamp, nonce, echostr, ref decryptEchoString);
            if (ret != 0)
            {
                //有错误的话记录日志
                //WriteLogFile("ERR: VerifyURL fail, ret: " + ret);
            }
            HttpContext.Current.Response.Write(decryptEchoString);
            HttpContext.Current.Response.End();
            return;
        }
}
}

注意：WXBizMsgCrypt类和Cryptography类，到微信官方下载即可：链接

3.写完代码，将文件更新到服务器，让这个 aspx文件能外网访问。然后再在

把这个aspx文件的链接填上去，若能正常返回，这里就会保存成功，若不能那就得再去补坑了....

二、接收消息

上面已经与微信那边打通了接口，接下来就是要正真接受消息了。开启消息是get请求，而正式使用接受消息则微信是post数据过来，所以  接口打通之后上面那些代码就没用了，因为数据传输模式和处理模式都不一样了。

我这里的接收消息，会把各种类型的文件存到数据库或者服务器，非文本的则存到服务器，放个路径到数据库

代码如下：

public partial class request_WxMsgApi : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        byte[] btHtml = Request.BinaryRead(Request.ContentLength);
        string strHtml = System.Text.Encoding.Default.GetString(btHtml);

        //接受消息
        if (Request.HttpMethod.ToUpper() == "POST")
        {
            string token = "your token";//从配置文件获取Token
            string encodingAESKey = "your EncodingAESKey";//从配置文件获取EncodingAESKey
            string corpId = System.Configuration.ConfigurationManager.AppSettings["corpid"];//从配置文件获取corpId

            string signature = HttpContext.Current.Request.QueryString["msg_signature"];
            string timestamp = HttpContext.Current.Request.QueryString["timestamp"];
            string nonce = HttpContext.Current.Request.QueryString["nonce"];
            string decryptEchoString = "";

            WXBizMsgCrypt wxcpt = new WXBizMsgCrypt(token, encodingAESKey, corpId);
            int ret = wxcpt.DecryptMsg(signature, timestamp, nonce, strHtml, ref decryptEchoString);
            if (ret == 0)
            {
                //WriteLogFile("ERR: VerifyURL fail, ret: " + ret);
                if (!string.IsNullOrEmpty(decryptEchoString))
                {
                    try
                    {
                        XmlDocument doc = new XmlDocument();
                        doc.LoadXml(decryptEchoString);
                        XmlNode root = doc.FirstChild;
                        var msgType = root["MsgType"].InnerText;//voice(MediaId),video(MediaId),text(Content),image(PicUrl),
                        if (msgType == "voice" || msgType == "video" || msgType == "text" || msgType == "image")
                        {
                            var msgId = root["MsgId"].InnerText;
                            var fromuser = root["FromUserName"].InnerText;
                            var timesend = root["CreateTime"].InnerText;//时间戳
                            DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
                            long lTime = long.Parse(timesend + "0000000");
                            TimeSpan toNow = new TimeSpan(lTime);
                            var cTime = dtStart.Add(toNow);
                            var content = "";

                            switch (msgType)
                            {
                                case "voice":
                                    content = root["MediaId"].InnerText;
                                    break;
                                case "video":
                                    content = root["MediaId"].InnerText;
                                    break;
                                case "text":
                                    content = root["Content"].InnerText;
                                    break;
                                case "image":
                                    content = root["PicUrl"].InnerText;
                                    break;
                                default:
                                    break;
                            }
                            string sql = "insert into T_CmpWxMsg([MsgId],[MsgType],[FromUser],[CreateTime],[Content]) values(@MsgId,@MsgType,@FromUser,@CreateTime,@Content)";
                            DataHelper.ExecuteNonQuery(sql, new System.Data.SqlClient.SqlParameter[]
                            {
                                new System.Data.SqlClient.SqlParameter("@MsgId", msgId),
                                new System.Data.SqlClient.SqlParameter("@MsgType", msgType),
                                new System.Data.SqlClient.SqlParameter("@FromUser", fromuser),
                                new System.Data.SqlClient.SqlParameter("@CreateTime", cTime),
                                new System.Data.SqlClient.SqlParameter("@Content", content)
                            }, conString);
                            //WriteLogFile("存入数据库成功" + cTime);

                            //异步任务-检索未下载的媒体文件
                            System.Threading.Tasks.Task.Factory.StartNew(() =>
                            {
                                //WriteLogFile("异步任务开始");
                                try
                                {
                                    //拉取媒体源文件
                                    string sql_ = "select ID,Content,MsgType from T_CmpWxMsg WHERE ISNULL(MediaSavePath,'')='' and MsgType in ('voice','video')";
                                    var mediaList = DataOperation.DataCenter.ExecuteReader(sql_, Base.ConString, new object[] { });
                                    foreach (var item in mediaList)
                                    {
                                        string corpsecret = System.Configuration.ConfigurationManager.AppSettings["corpsecret"];//你的应用对应的secrect
                                        string tocken = Base.GetCorpToken(corpsecret, corpId).Access_Token;//拿取tocken，注意有效时间，最好用缓存控制
                                        string url = string.Format("https://qyapi.weixin.qq.com/cgi-bin/media/get?access_token={0}&media_id={1}", tocken, item.Content);

                                        string upfile = Path.Combine(System.AppDomain.CurrentDomain.BaseDirectory, @"file\wxMaterial");
                                        if (!System.IO.Directory.Exists(upfile))
                                            System.IO.Directory.CreateDirectory(upfile);

                                        string filePath = upfile + "\\" + item.Content + (item.MsgType == "voice" ? ".amr" : ".mp4");
                                        WebClient client = new WebClient();
                                        client.DownloadFile(url, filePath);

                                        //更新存储的物理路径
                                        string updatesql = "update T_CmpWxMsg set MediaSavePath = '" + (@"\file\wxMaterial\" + item.Content + (item.MsgType == "voice" ? ".amr" : ".mp4")) + "' where ID='" + item.ID + "'";
                                        DataHelper.ExecuteNonQuery(updatesql, Base.ConString);
                                    }
                                }
                                catch (Exception ex) {
                                    //WriteLogFile("异步任务执行出错：" + ex.Message);
                                }
                            });
                        }
                    }
                    catch (Exception ex)
                    {
                       // WriteLogFile("程序异常：" + ex.Message);
                    }
                    finally
                    {
                        //WriteLogFile("解密消息内容：" + decryptEchoString);
                        HttpContext.Current.Response.Write(decryptEchoString);
                        HttpContext.Current.Response.End();
                    }
                }
            }
        }
    }
}

注意：这里用到的WXBizMsgCrypt类，在上面有提到可以到官方下载。

三、发送消息

string msg = "你好！<a href=\"https://blog.csdn.net/u012847695/article/details/102936505\">点这里查看</a>";
//按部门发送
//item = new { toparty = "438|439|471", msgtype = "text", agentid = "8", text = new { content = msg }, safe = "0" };
//按人发送
dynamic item = new { touser = "wanger|liuer", msgtype = "text", agentid = "你的应用对应的agentid", text = new { content = msg }, safe = "0" };
var body = Base.DataToJson(item);
var corpsecret = System.Configuration.ConfigurationManager.AppSettings["corpsecret"];
string tocken = Base.GetCorpToken(corpsecret).Access_Token;//获取token,注意有效时间，可用缓存控制
string url = string.Format("https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token={0}", tocken);
var result = Base.InfoPost(url, body);//post request 请求
JavaScriptSerializer js = new JavaScriptSerializer();
IDictionary obj = js.DeserializeObject(result) as IDictionary;

post请求代码

 public static string InfoPost(string url, string body)
    {
        HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(new Uri(url));
        request.Timeout = 30000;//30秒
        request.Method = "POST";
        byte[] payload = System.Text.Encoding.UTF8.GetBytes(body);
        Stream writer = request.GetRequestStream();
        writer.Write(payload, 0, payload.Length);
        writer.Close();
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8"));
        var result = reader.ReadToEnd();
        return result;
    }

下次来写个支付的，自己写的看得懂点，不然每次才坑都要各种百度查资料

以上纯属个人独自研究成果，仅供参考，转载请注明出处