微信发送模板消息

自己封装个类库，用于微信开发

/// <summary>
/// 公众号的全局唯一接口调用凭据，公众号调用各接口时都需使用access_token。
/// access_token的存储至少要保留512个字符空间。access_token的有效期目前为2个小时，需定时刷新，重复获取将导致上次获取的access_token失效。
/// </summary>
public class Access_token
{
    public Access_token()
    {
        //  
        //TODO:用于验证Access_token是否过期实体
        //  
    }

    /// <summary>
    /// 获取到的凭证
    /// </summary>
    public string access_token { get; set; }

    /// <summary>
    /// 凭证有效时间，单位：秒
    /// </summary>
    public string expires_in { get; set; }
}

/// <summary>
/// 微信主要处理类
/// </summary>
public static class Main
{
    /// <summary>
    /// 获取AccessToken 为null表示获取失败
    /// </summary>
    /// <param name="AppId">第三方用户唯一凭证</param>
    /// <param name="AppSecret">第三方用户唯一凭证密钥，即appsecret</param>
    /// <returns>Access_token</returns>
    public static Access_token GetAccessToken(string AppId, string AppSecret)
    {
        //grant_type    获取access_token填写client_credential
        //appid         第三方用户唯一凭证
        //secret        第三方用户唯一凭证密钥，即appsecret
        string strUrl = string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", AppId, AppSecret);//微信获取Accesstoken接口地址

        Access_token res = new Access_token();

        //正常情况下，微信会返回下述JSON数据包给公众号：
        //{ "access_token":"ACCESS_TOKEN","expires_in":7200}
        //access_token    获取到的凭证
        //expires_in    凭证有效时间，单位：秒
        //错误时微信会返回错误码等信息
        //{"errcode":40013,"errmsg":"invalid appid"}
        string retString = WebRequestExt.GetData(strUrl);
        if (retString.IndexOf("7200") > 0)//Accesstoken有效时间2小时
        {
            //Newtonsoft.Json 反序列化
            res = JsonConvert.DeserializeObject<Access_token>(retString);
        }
        else
        {
            res = null;
        }
        return res;
    }

    /// <summary>
    /// 发送模板消息（每次只能发一条，目前每日上限10万次）
    /// </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">消息跳转地址</param>
    /// <param name="SenderName">发送人姓名</param>
    /// <param name="Title">发送标题</param>
    /// <param name="Content">发送内容</param>
    /// <returns>返回发送结果</returns>
    public static string TemplateMsg_Send(string access_token, string strJson)
    {
        string result = string.Empty;//消息发送结果
        try
        {
            //发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 发送给微信服务器的模板消息格式
            //string strJson = "{" +
            //               ""touser":"" + Receiver_OpenID + ""," +
            //               ""template_id":"" + TemplateId + ""," +
            //               ""url":"" + MsgUrl + ""," +
            //               ""topcolor":"#FF0000"," +
            //               ""data":{" +
            //                          ""first":{" +
            //                                       ""value":"" + SenderName + "给你发来最新消息！"," +
            //                                       ""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

            //在调用模板消息接口后，会返回JSON数据包。正常时的返回JSON数据包示例：
            //{"errcode":0,"errmsg":"ok","msgid":200228332}
            result = WebRequestExt.PostData(strJson, PostUrl);
        }
        catch (Exception ex)
        {
            result = ex.Message;
        }
        return result;
    }
}

使用的大概逻辑：

Model层新建类Access_token

public class Access_token
{
    /// <summary>
    /// 获取到的凭证
    /// </summary>
    public string access_token { get; set; }

    /// <summary>
    /// 凭证有效截止时间
    /// </summary>
    public DateTime ValidTime { get; set; }
}

结合redis或其他数据库使用

public Model.Access_token GetAccess_token_redis()
{
    //从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中没有
        Set_Access_token_redis(mod_Access_token);
    }
    else
    {//redis中存在 判断是否过期
        if (mod_Access_token.ValidTime < DateTime.Now)//已过期
        {
            Set_Access_token_redis(mod_Access_token);
        }
    }//else

    return mod_Access_token;
}

/// <summary>
/// 从微信接口取Access_token 存储到redis中
/// </summary>
/// <param name="mod_Access_token"></param>
private void Set_Access_token_redis(Access_token mod_Access_token)
{
    //从微信接口取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")
    {//拿到正确Access_token
        mod_Access_token.access_token = Access_token.access_token;
        mod_Access_token.ValidTime = DateTime.Now.AddSeconds(7200);

        //存储到redis中
        BLL.SERedisHelper.HashSet("Access_token", "Access_token", mod_Access_token);
    }
}

/// <summary>
/// 获取微信配置 先从redis里面取 不存在从数据库中取
/// </summary>
/// <returns></returns>
public Model.wxConfig GetwxConfigModel_redis()
{
    //从redis中取
    Model.wxConfig cfg = SERedisHelper.HashGet<Model.wxConfig>("wxConfig", "wxConfig");
    if (cfg == null)
    {
        cfg = new wxConfig();

        //从数据库中取
        List<Model.WeChatSysConfig> lst = GetModelList("ID between 600 and 604");
        foreach (Model.WeChatSysConfig item in lst)
        {
            switch (item.ItemName)
            {
                case "AppId"://微信唯一标识
                    cfg.AppId = item.ItemValue;
                    break;
                case "AppSecret"://微信密钥
                    cfg.AppSecret = item.ItemValue;
                    break;
                case "Token"://微信配置标码（自定义）
                    cfg.Token = item.ItemValue;
                    break;
                case "ServerName"://部署的服务器域名
                    cfg.ServerName = item.ItemValue;
                    break;
                case "Templateid"://发送模版消息ID
                    cfg.Templateid = item.ItemValue;
                    break;
                default:
                    break;
            }
        }

        //存储到redis 默认永不过期
        SERedisHelper.HashSet("wxConfig", "wxConfig",cfg);
    }
    return cfg;
}