微信公众号开发之设置自定义菜单实例

本实例是为了实现在管理后台实现微信菜单的添加删除管理。

1、首先我们需要新建一个数据库表用于存放menu菜单项

可包含的字段有id、父类id、name、排序、是否显示、类型（view、click）、链接、adddate

注意后台存menu菜单数据时，parentId=-1为一级菜单，或parendId为一级菜单的id作为该一级菜单下的二级菜单

2、在设置菜单时需要向微信接口传menuJson字符串，所以要先拼接字符串，后台定义一个creatMenu()

public bool creatMenu()
        {
            string menuJson = "";
            //这里默认parentId=-1为最外层菜单，isactive=1为显示,responseType=1为click类型
            DataTable dtAMenu = Service.SelectDataTable("id, name, responseType, jsonStr,url", "WEIXINMENU", " parentId=-1 and isactive=1 order by sort");
            if (dtAMenu.Rows.Count > 0)
            {
                menuJson = "{\"button\":[";
                for (int i = 0; i < dtAMenu.Rows.Count; i++)
                {
                    DataTable dtBMenu = Service.SelectDataTable("id, name, responseType, jsonStr,url", wx, " parentId=" + dtAMenu.Rows[i]["id"].ToString() + " and isactive=1 order by sort");
                    if (dtBMenu.Rows.Count > 0)
                    {
                        menuJson += "{\"name\":\"" + dtAMenu.Rows[i]["name"].ToString() + "\",\"sub_button\":[";
                        for (int j = 0; j < dtBMenu.Rows.Count; j++)
                        {
                            if (Convert.ToInt32(dtBMenu.Rows[j]["responseType"]) == 2)
                            {
                                menuJson += "{\"type\":\"view\",\"name\":\"" + dtBMenu.Rows[j]["name"].ToString() + "\",\"url\":\"" + dtBMenu.Rows[j]["jsonStr"].ToString() + "\"},";
                            }
                            else
                            {
                                menuJson += "{\"type\":\"click\",\"name\":\"" + dtBMenu.Rows[j]["name"].ToString() + "\",\"key\":\"eventKey_" + dtBMenu.Rows[j]["id"].ToString() + "\"},";
                            }
                        }
                        menuJson = menuJson.TrimEnd(',');
                        menuJson += "]},";
                    }
                    else
                    {
                        //if (Convert.ToInt32(dtAMenu.Rows[i]["responseType"]) == 2)
                        //{
                            menuJson += "{\"type\":\"view\",\"name\":\"" + dtAMenu.Rows[i]["name"].ToString() + "\",\"url\":\"" + dtAMenu.Rows[i]["jsonStr"].ToString() + "\"},";
                        //}
                        //else
                        //{
                        //    menuJson += "{\"type\":\"click\",\"name\":\"" + dtAMenu.Rows[i]["name"].ToString() + "\",\"key\":\"eventKey_" + dtAMenu.Rows[i]["id"].ToString() + "\"},";
                        //}
                    }
                    dtBMenu.Dispose();
                }
                dtAMenu.Dispose();

                menuJson = menuJson.TrimEnd(',');
                menuJson += "]}";
                menuJson = menuJson.Trim();

                return requstZmToCreatMent(menuJson);
             
            }
            else
            {
                return false;
            }
        }

3、获取到menujson字符串后调用微信接口创建菜单，需先获取assess token,有关assess token获取可参考：获取AccessToken

/// <summary>
        /// 向微信服务器请求创建自定义菜单
        /// </summary>
        /// <param name="jsonStr"></param>
        /// <returns></returns>
        /// 
        private bool requstZmToCreatMent(string jsonStr)
        {
            try
            {
                var AccessToken = "";//accesstoken需例外获取，一般可开始时获取后存数据库，下次从数据库取，注意accesstoken有效期为7200秒
                //声明一个HttpWebRequest请求
                string interfaceUrl = "https://api.weixin.qq.com/cgi-bin/menu/create?access_token=" + AccessToken;
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(interfaceUrl);
                //设置连接超时时间 
                request.Timeout = 30000;
                request.KeepAlive = true;
                Encoding encodeType = Encoding.GetEncoding("UTF-8");
                request.Headers.Set("Pragma", "no-cache");
                request.Method = "POST";

                request.ContentType = "application/x-www-form-urlencoded";
                request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; Maxthon; .NET CLR 1.1.4322); Http STdns";
                request.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*";
                request.CookieContainer = new CookieContainer();
                byte[] Bytes = encodeType.GetBytes(jsonStr);

                request.ContentLength = Bytes.Length;
                request.AllowAutoRedirect = true;

                //发送数据
                using (Stream writer = request.GetRequestStream())
                {
                    writer.Write(Bytes, 0, Bytes.Length);
                    writer.Close();
                }

                StringBuilder strb = new StringBuilder();
                //接收数据
                using (Stream reader = request.GetResponse().GetResponseStream())
                {
                    StreamReader sr = new StreamReader(reader, encodeType);
                    strb.Append(sr.ReadToEnd());
                    sr.Close();
                    reader.Close();
                }

                if ((strb.ToString().IndexOf("\"errcode\":42001") != -1) || (strb.ToString().IndexOf("\"errcode\":40001") != -1) || (strb.ToString().IndexOf("\"errcode\":40014") != -1) || (strb.ToString().IndexOf("\"errcode\":41001") != -1)) //access_token错误
                {
                    // AccessToken = getAccessToken();
                    getzmAccessToken();
                    return requstZmToCreatMent(jsonStr);
                }
                else
                {
                    if (strb.ToString() == "{\"errcode\":0,\"errmsg\":\"ok\"}")
                    {
                        return true;
                    }
                    else
                    {
                        return false;
                    }
                }
            }
            catch (Exception exp)
            {
                return false;
            }
        }