微信小程序訂閱消息推送

開發配置配置

服務器配置

• 在小程序后臺開啟消息推送（開發-開發設置-消息推送）文檔地址
• 這里需要服務提供驗證簽名的接口 將下面代碼發布到服務器并使用80或443端口訪問（我在使用其他端口時出現問題 80和443端口正常） 例如：https://www.baidu.com/api/wx/CheckWxSignature

  /// <summary>
  /// 接口認證
  /// </summary>
  /// <param name="echostr">回傳參數</param>
  /// <param name="signature">加密字段</param>
  /// <param name="timestamp">時間搓</param>
  /// <param name="nonce">隨機字符串</param>
  /// <returns></returns>
  [HttpGet,Route("api/wx/CheckWxSignature")]
  public IActionResult CheckWxSignature(string echostr, string signature, string timestamp, string nonce)
  {
      string token = "test";
      if (!CheckSignature(token, signature, timestamp, nonce))
      {
          return Ok("error");
      }
      return Ok(echostr);
  }
  /// <summary>
  /// 驗證微信簽名
  /// </summary>
  private bool CheckSignature(string token, string signature, string timestamp, string nonce)
  {
      string[] ArrTmp = { token, timestamp, nonce };
  
      Array.Sort(ArrTmp);
      string tmpStr = string.Join("", ArrTmp);
      var data = SHA1.Create().ComputeHash(Encoding.UTF8.GetBytes(tmpStr));
      var sb = new StringBuilder();
      foreach (var t in data)
      {
          sb.Append(t.ToString("X2"));
      }
      tmpStr = sb.ToString();
      tmpStr = tmpStr.ToLower();
  
      if (tmpStr == signature)
      {
          return true;
      }
      else
      {
          return false;
      }
  }
  

小程序配置

小程序訂閱消息在每次發送消息前需要詢問用戶是否授權，授權成功后才能調用。每次授權后只有一次調用權限。

服務器配置成功后還需要在小程序授權后才能調用，一次性授權的意思是授權后只有一次的調用權限.

wx.requestSubscribeMessage({
  tmplIds: ['template_id'], // 此處可填寫多個模板 ID，但低版本微信不兼容只能授權一個
  success (res) {
    console.log('已授權接收訂閱消息')
  }
})

開發者工具目前無法調用接口，只能在真機上運行

服務端消息發送

WeChatHelper.cs

public class WeChatHelper{

    private static string WXAppId="";
    private static string WXAppSecret="";
    /// <summary>
    /// 對頁面是否要用授權 
    /// </summary>
    /// <param name="Appid">微信應用id</param>
    /// <param name="redirect_uri">回調頁面</param>
    /// <param name="scope">應用授權作用域snsapi_base（不彈出授權頁面，直接跳轉，只能獲取用戶openid），snsapi_userinfo （彈出授權頁面，可通過openid拿到昵稱、性別、所在地。并且，即使在未關注的情況下，只要用戶授權，也能獲取其信息）</param>
    /// <returns>授權地址</returns>
    public static string GetToken()
    {
        string url = string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", WXAppId, WXAppSecret);
        string ReText = HttpClients.WebRequestPostOrGet(url, "");//post/get方法獲取信息 
        try
        {
            var obj = JsonConvert.DeserializeObject<Tokens>(ReText);
            return obj.access_token;
        }
        catch (Exception ex)
        {
            return "";
        }
    }

    
    public static object SendMessage(string token)
    {
        var access_token = token;
        string url = $"https://api.weixin.qq.com/cgi-bin/message/subscribe/send?access_token={access_token}";
        var dic = new Dictionary<string,object>();//組裝模板內容
        dic.Add("character_string8",new { value = "2020071212121351" });//訂單編號
        dic.Add("amount5",new { value= "20.00" });//訂單金額
        dic.Add("time10", new { value = "2020-07-13 12:00:00" });//訂單時間
        dic.Add("name3", new { value = "商戶名稱" });//商戶名稱
        dic.Add("phrase1", new { value = "已支付" });//訂單狀態
        var data = new MessageData()
        {
            touser = "微信openid",
            template_id = "模板id",
            page = "需要跳轉的小程序地址 不跳轉就不填寫",
            data = dic
        };
        string ReText = HttpClients.WebRequestPostOrGet(url, JsonConvert.SerializeObject(data));//post/get方法獲取信息 
        return ReText;
    }
}

HttpClients.cs

 public class HttpClients{
     //發起Http請求
        public static string HttpPost(string url, Stream data, IDictionary<object, string> headers = null)
        {
            System.Net.WebRequest request = HttpWebRequest.Create(url);
            request.Method = "POST";
            if (data != null)
                request.ContentLength = data.Length;
            //request.ContentType = "application/x-www-form-urlencoded;charset=utf-8";

            if (headers != null)
            {
                foreach (var v in headers)
                {
                    if (v.Key is HttpRequestHeader)
                        request.Headers[(HttpRequestHeader)v.Key] = v.Value;
                    else
                        request.Headers[v.Key.ToString()] = v.Value;
                }
            }
            HttpWebResponse response = null;
            try
            {
                // Get the response.
                response = (HttpWebResponse)request.GetResponse();
                // Display the status.
                Console.WriteLine(response.StatusDescription);
                // Get the stream containing content returned by the server.
                Stream dataStream = response.GetResponseStream();
                // Open the stream using a StreamReader for easy access.
                StreamReader reader = new StreamReader(dataStream);
                // Read the content.
                string responseFromServer = reader.ReadToEnd();
                // Cleanup the streams and the response.
                reader.Close();
                dataStream.Close();
                response.Close();
                return responseFromServer;
            }
            catch (Exception e)
            {
                return e.Message;
            }
        }
 }

template_Id在小程序后臺進行設置（功能-訂閱消息-我的模板中進行添加）

這里代碼只做參考 具體實現請不要使用靜態類 并且access_token也需要緩存1-2小時 access_token過期時進行刷新