微信公众号开发参考

/// <summary>
    /// 验证微信签名
    /// </summary>
    /// <returns></returns>
    /// 将token、timestamp、nonce三个参数进行字典序排序
    /// 将三个参数字符串拼接成一个字符串进行sha1加密
    /// 开发者获得加密后的字符串可与signature对比，标识该请求来源于微信。
    private bool CheckSignature()
    {
        string signature = Convert.ToString(Request["signature"]);
        string timestamp = Convert.ToString(Request["timestamp"]);
        string nonce = Convert.ToString(Request["nonce"]);
        string[] ArrTmp = { Token, timestamp, nonce };
        Array.Sort(ArrTmp);   //字典排序 
        string tmpStr = string.Join("", ArrTmp);
        tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");
        tmpStr = tmpStr.ToLower();
        if (tmpStr == signature)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

 签名验证通过，再加载菜单

//加载菜单

public void GetMenuList()
        {
            string menu = "";
            menu = @" { 
     ""button"":[ 
     {   
          ""type"":""click"", 
          ""name"":""你好!"", 
          ""key"":""hello"" 
      }, 
      { 
           ""type"":""view"", 
           ""name"":""公司简介"", 
           ""url"":""http://www.xnfhtech.com/index.html"" 
      }, 
      { 
           ""name"":""产品介绍"", 
           ""sub_button"":[ 
            { 
               ""type"":""click"", 
               ""name"":""产品1"", 
                ""key"":""p1"" 
            }, 
            { 
               ""type"":""click"", 
               ""name"":""产品2"", 
               ""key"":""p2"" 
            }] 
       }] 
 } 
"; 
            string access_token = IsExistAccess_Token();
            string i = MenuCreate(menu, access_token);
            Response.Write(i);
        }
 
        public string MenuCreate(string MenuJson, string access_token)
        {
            JavaScriptSerializer Jss = new JavaScriptSerializer();
            string setMenuUrl = "https://api.weixin.qq.com/cgi-bin/menu/create?access_token={0}";
            setMenuUrl = string.Format(setMenuUrl, access_token);//获取token、拼凑url
            string respText = WebRequestPostOrGet(setMenuUrl, MenuJson);
            Dictionary<string, object> respDic = (Dictionary<string, object>)Jss.DeserializeObject(respText);
            return respDic["errcode"].ToString();//返回0发布成功
        }
 
        /// <summary>
        /// Post/get 提交调用抓取
        /// </summary>
        /// <param name="url">提交地址</param>
        /// <param name="param">参数</param>
        /// <returns>string</returns>
        public string WebRequestPostOrGet(string sUrl, string sParam)
        {
            byte[] bt = System.Text.Encoding.UTF8.GetBytes(sParam);
 
            Uri uriurl = new Uri(sUrl);
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(uriurl);//HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url + (url.IndexOf("?") > -1 ? "" : "?") + param);
            req.Method = "Post";
            req.Timeout = 120 * 1000;
            req.ContentType = "application/x-www-form-urlencoded;";
            req.ContentLength = bt.Length;
 
            using (Stream reqStream = req.GetRequestStream())//using 使用可以释放using段内的内存
            {
                reqStream.Write(bt, 0, bt.Length);
                reqStream.Flush();
            }
            try
            {
                using (WebResponse res = req.GetResponse())
                {
                    //在这里对接收到的页面内容进行处理
                    Stream resStream = res.GetResponseStream();
                    StreamReader resStreamReader = new StreamReader(resStream, System.Text.Encoding.UTF8);
                    string resLine;
                    System.Text.StringBuilder resStringBuilder = new System.Text.StringBuilder();
                    while ((resLine = resStreamReader.ReadLine()) != null)
                    {
                        resStringBuilder.Append(resLine + System.Environment.NewLine);
                    }
                    resStream.Close();
                    resStreamReader.Close();
                    return resStringBuilder.ToString();
                }
            }
            catch (Exception ex)
            {
                return ex.Message;//url错误时候回报错
            }
        }

/// <summary>
/// 防止每次请求的token两个小时的变化
/// </summary>
public class WA_GetAccess_Token
{
    public WA_GetAccess_Token()
    {
    }
 
    public static WAEntity.Access_token GetAccess_Token()
    {
        string url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="+ ConfigurationManager.AppSettings["AppID"] + "&secret="+ ConfigurationManager.AppSettings["AppSecret"];
        Access_token entity = new Access_token();
        try
        {
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
            req.Method = "GET";
            using (WebResponse wr = req.GetResponse())
            {
                HttpWebResponse myResponse = (HttpWebResponse)req.GetResponse();
                StreamReader reader = new StreamReader(myResponse.GetResponseStream(), System.Text.Encoding.UTF8);
                string content = reader.ReadToEnd();
                Access_token token = new Access_token();
                token = JsonHelper.ParseFromJson<Access_token>(content);
                entity.access_token = token.access_token;
                entity.expires_in = token.expires_in;
            }
        }
        catch{ //记录日志}
        return entity;
    }
 
 
    /// <summary> 
    /// 根据当前日期 判断Access_Token 是否超期  如果超期返回新的Access_Token   否则返回之前的Access_Token 
    /// </summary> 
    /// <param name="datetime"></param> 
    /// <returns></returns> 
    public static string IsExistAccess_Token()
    {
        try
        {
            string Token = string.Empty;
            DateTime YouXRQ;
            //读取XML文件中的数据，并显示出来
            string filepath = HttpContext.Current.Request.MapPath("~/XMLFile.xml");
            StreamReader str = new StreamReader(filepath, System.Text.Encoding.UTF8);
            XmlDocument xml = new XmlDocument();
            xml.Load(str);
            str.Close();
            str.Dispose();
            Token = xml.SelectSingleNode("xml").SelectSingleNode("Access_Token").InnerText;
            YouXRQ = Convert.ToDateTime(xml.SelectSingleNode("xml").SelectSingleNode("Access_YouXRQ").InnerText);
            if (DateTime.Now > YouXRQ)
            {
                DateTime _youxrq = DateTime.Now;
                WAEntity.Access_token mode = GetAccess_Token();
                xml.SelectSingleNode("xml").SelectSingleNode("Access_Token").InnerText = mode.access_token;
                _youxrq = _youxrq.AddSeconds(Convert.ToInt32(mode.expires_in));
                xml.SelectSingleNode("xml").SelectSingleNode("Access_YouXRQ").InnerText = _youxrq.ToString();
                xml.Save(filepath);
                Token = mode.access_token;
            }
            return Token;
        }
        catch (Exception ex)
        {
            return "";//记录日志
        }
    }
}
 
public class Access_token
{
    public Access_token()
    { }
 
    public string access_token { get; set; }
    public string expires_in { get; set; }
}
 
public class JsonHelper
{
    /// <summary> 
    /// 生成Json格式 
    /// </summary> 
    /// <typeparam name="T"></typeparam> 
    /// <param name="obj"></param> 
    /// <returns></returns> 
    public static string GetJson<T>(T obj)
    {
        DataContractJsonSerializer json = new DataContractJsonSerializer(obj.GetType());
        using (MemoryStream stream = new MemoryStream())
        {
            json.WriteObject(stream, obj);
            string szJson = Encoding.UTF8.GetString(stream.ToArray()); return szJson;
        }
    }
    /// <summary> 
    /// 获取Json的Model 
    /// </summary> 
    /// <typeparam name="T"></typeparam> 
    /// <param name="szJson"></param> 
    /// <returns></returns> 
    public static T ParseFromJson<T>(string szJson)
    {
        T obj = Activator.CreateInstance<T>();
        using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(szJson)))
        {
            DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());
            return (T)serializer.ReadObject(ms);
        }
    }
}

XMLFile.xml

<?xml version="1.0" encoding="utf-8"?>
<xml>
  <Access_Token>获取TOKEN</Access_Token>
  <Access_YouXRQ>2015/9/12 17:56:31</Access_YouXRQ>
</xml>

参考：https://www.cnblogs.com/JeffController/p/5875563.html