c#微信公众号开发中如何实现自定义菜单栏

/// <summary>/// 自定义公众号界面菜单项/// </summary>/// <returns></returns>public string CreateMenu()   {     string url = "https://api.weixin.qq.com/cgi-bin/menu/create?access_token=" + Config.WxConfig.Config.access_token;     string data = "{\"button\":[{\"name\":\"Dotnet专栏\",\"sub_button\":[{\"type\":\"view\",\"name\":\"关于我\",\"url\":\"https://blog.csdn.net/Hakim2214\"},{\"type\":\"view\",\"name\":\"微信开发\",\"url\":\"https://developers.weixin.qq.com/doc/offiaccount/Getting_Started/Overview.html\"}]},{\"name\":\"测试\",\"sub_button\":[{\"type\":\"view\",\"name\":\"运维百科\",\"url\":\"https://blog.csdn.net/Hakim2214\"},{\"type\":\"view\",\"name\":\"在线考试\",\"url\":\"http://sfmes.rjtx.net:55291/MobileApp/index.html\"}]}]}";     System.Net.HttpWebRequest httpWebRequest = (HttpWebRequest)System.Net.WebRequest.Create(url);     httpWebRequest.Method = "POST";     byte[] postBytes = Encoding.UTF8.GetBytes(data);     httpWebRequest.ContentType = "application/json; charset=utf-8";//     httpWebRequest.ContentLength = Encoding.UTF8.GetByteCount(data);//data为json字符串     Stream stream = httpWebRequest.GetRequestStream();     stream.Write(postBytes, 0, postBytes.Length);     stream.Close();//发送完毕，接受返回值     var response = httpWebRequest.GetResponse();     Stream streamResponse = response.GetResponseStream();     StreamReader streamRead = new StreamReader(streamResponse);     String responseString = streamRead.ReadToEnd();     return responseString; }