微信發送模板消息

自己封裝個類庫，用於微信開發

/// <summary>
/// 公眾號的全局唯一接口調用憑據，公眾號調用各接口時都需使用access_token。
/// access_token的存儲至少要保留512個字符空間。access_token的有效期目前為2個小時，需定時刷新，重復獲取將導致上次獲取的access_token失效。
/// </summary>
public class Access_token
{
    public Access_token()
    {
        //  
        //TODO:用於驗證Access_token是否過期實體
        //  
    }

    /// <summary>
    /// 獲取到的憑證
    /// </summary>
    public string access_token { get; set; }

    /// <summary>
    /// 憑證有效時間，單位：秒
    /// </summary>
    public string expires_in { get; set; }
}

/// <summary>
/// 微信主要處理類
/// </summary>
public static class Main
{
    /// <summary>
    /// 獲取AccessToken 為null表示獲取失敗
    /// </summary>
    /// <param name="AppId">第三方用戶唯一憑證</param>
    /// <param name="AppSecret">第三方用戶唯一憑證密鑰，即appsecret</param>
    /// <returns>Access_token</returns>
    public static Access_token GetAccessToken(string AppId, string AppSecret)
    {
        //grant_type    獲取access_token填寫client_credential
        //appid         第三方用戶唯一憑證
        //secret        第三方用戶唯一憑證密鑰，即appsecret
        string strUrl = string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", AppId, AppSecret);//微信獲取Accesstoken接口地址

        Access_token res = new Access_token();

        //正常情況下，微信會返回下述JSON數據包給公眾號：
        //{ "access_token":"ACCESS_TOKEN","expires_in":7200}
        //access_token    獲取到的憑證
        //expires_in    憑證有效時間，單位：秒
        //錯誤時微信會返回錯誤碼等信息
        //{"errcode":40013,"errmsg":"invalid appid"}
        string retString = WebRequestExt.GetData(strUrl);
        if (retString.IndexOf("7200") > 0)//Accesstoken有效時間2小時
        {
            //Newtonsoft.Json 反序列化
            res = JsonConvert.DeserializeObject<Access_token>(retString);
        }
        else
        {
            res = null;
        }
        return res;
    }

    /// <summary>
    /// 發送模板消息（每次只能發一條，目前每日上限10萬次）
    /// </summary>
    /// <param name="access_token"></param>
    /// <param name="TemplateId">模板消息ID</param>
    /// <param name="Receiver_OpenID">接收者openid</param>
    /// <param name="MsgUrl">消息跳轉地址</param>
    /// <param name="SenderName">發送人姓名</param>
    /// <param name="Title">發送標題</param>
    /// <param name="Content">發送內容</param>
    /// <returns>返回發送結果</returns>
    public static string TemplateMsg_Send(string access_token, string strJson)
    {
        string result = string.Empty;//消息發送結果
        try
        {
            //發送模板消息的微信接口地址
            string PostUrl = "https://api.weixin.qq.com/cgi-bin/message/template/send?access_token=" + access_token;

            #region 發送給微信服務器的模板消息格式
            //string strJson = "{" +
            //               "\"touser\":\"" + Receiver_OpenID + "\"," +
            //               "\"template_id\":\"" + TemplateId + "\"," +
            //               "\"url\":\"" + MsgUrl + "\"," +
            //               "\"topcolor\":\"#FF0000\"," +
            //               "\"data\":{" +
            //                          "\"first\":{" +
            //                                       "\"value\":\"" + SenderName + "給你發來最新消息！\"," +
            //                                       "\"color\":\"#173177\"" +
            //                                     "}," +
            //                          "\"keyword1\":{" +
            //                                       "\"value\":\"" + FormatClear(Title) + "\"," +
            //                                       "\"color\":\"#173177\"" +
            //                                    "}," +
            //                          "\"keyword2\":{" +
            //                                       "\"value\":\"" + DateTime.Now + "\"," +
            //                                       "\"color\":\"#173177\"" +
            //                                    "}," +
            //                          "\"keyword3\":{" +
            //                                       "\"value\":\"" + FormatClear(Content) + "\"," +
            //                                       "\"color\":\"#173177\"" +
            //                                    "}," +
            //                          "\"remark\":{" +
            //                                       "\"value\":\"\"," +
            //                                       "\"color\":\"#173177\"" +
            //                                    "}" +
            //                         "}" +
            //           "}"; 
            #endregion

            //在調用模板消息接口后，會返回JSON數據包。正常時的返回JSON數據包示例：
            //{"errcode":0,"errmsg":"ok","msgid":200228332}
            result = WebRequestExt.PostData(strJson, PostUrl);
        }
        catch (Exception ex)
        {
            result = ex.Message;
        }
        return result;
    }
}

使用的大概邏輯：

Model層新建類Access_token

public class Access_token
{
    /// <summary>
    /// 獲取到的憑證
    /// </summary>
    public string access_token { get; set; }

    /// <summary>
    /// 憑證有效截止時間
    /// </summary>
    public DateTime ValidTime { get; set; }
}

結合redis或其他數據庫使用

public Model.Access_token GetAccess_token_redis()
{
    //從redis中取Access_token
    Model.Access_token mod_Access_token = DFS.BLL.SERedisHelper.HashGet<Model.Access_token>("Access_token", "Access_token");
    if (mod_Access_token == null)
    {//redis中沒有
        Set_Access_token_redis(mod_Access_token);
    }
    else
    {//redis中存在 判斷是否過期
        if (mod_Access_token.ValidTime < DateTime.Now)//已過期
        {
            Set_Access_token_redis(mod_Access_token);
        }
    }//else

    return mod_Access_token;
}

/// <summary>
/// 從微信接口取Access_token 存儲到redis中
/// </summary>
/// <param name="mod_Access_token"></param>
private void Set_Access_token_redis(Access_token mod_Access_token)
{
    //從微信接口取Access_token
    Model.wxConfig mod_wxConfig = GetwxConfigModel_redis();
    WeChat.Access_token Access_token = WeChat.Main.GetAccessToken(mod_wxConfig.AppId, mod_wxConfig.AppSecret);

    if (Access_token.expires_in == "7200")
    {//拿到正確Access_token
        mod_Access_token.access_token = Access_token.access_token;
        mod_Access_token.ValidTime = DateTime.Now.AddSeconds(7200);

        //存儲到redis中
        BLL.SERedisHelper.HashSet("Access_token", "Access_token", mod_Access_token);
    }
}

/// <summary>
/// 獲取微信配置 先從redis里面取 不存在從數據庫中取
/// </summary>
/// <returns></returns>
public Model.wxConfig GetwxConfigModel_redis()
{
    //從redis中取
    Model.wxConfig cfg = SERedisHelper.HashGet<Model.wxConfig>("wxConfig", "wxConfig");
    if (cfg == null)
    {
        cfg = new wxConfig();

        //從數據庫中取
        List<Model.WeChatSysConfig> lst = GetModelList("ID between 600 and 604");
        foreach (Model.WeChatSysConfig item in lst)
        {
            switch (item.ItemName)
            {
                case "AppId"://微信唯一標識
                    cfg.AppId = item.ItemValue;
                    break;
                case "AppSecret"://微信密鑰
                    cfg.AppSecret = item.ItemValue;
                    break;
                case "Token"://微信配置標碼（自定義）
                    cfg.Token = item.ItemValue;
                    break;
                case "ServerName"://部署的服務器域名
                    cfg.ServerName = item.ItemValue;
                    break;
                case "Templateid"://發送模版消息ID
                    cfg.Templateid = item.ItemValue;
                    break;
                default:
                    break;
            }
        }

        //存儲到redis 默認永不過期
        SERedisHelper.HashSet("wxConfig", "wxConfig",cfg);
    }
    return cfg;
}