微信帮助类

HttpHelper模拟post和get请求
 public class HttpHelper
    {
        /// <summary>
        /// 模拟post请求
        /// </summary>
        /// <param name="url">url</param>
        /// <param name="data">数据</param>
        /// <returns></returns>
        public static string HttpPost(string url, string data)
        {
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            CookieContainer cookies = new CookieContainer();
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.CookieContainer = cookies;
            Stream resStream = request.GetRequestStream();
            StreamWriter StreamWriter = new StreamWriter(resStream, Encoding.UTF8);
            StreamWriter.Write(data);
            StreamWriter.Close();
            HttpWebResponse response = request.GetResponse() as HttpWebResponse;
            response.Cookies = cookies.GetCookies(response.ResponseUri);
            Stream responseStream = response.GetResponseStream();
            StreamReader reader = new StreamReader(responseStream, Encoding.UTF8);
            string result = reader.ReadToEnd();
            responseStream.Close();
            reader.Close();
            return result;
        }
        /// <summary>
        /// 模拟get请求
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static string HttpGet(string url)
        {
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            request.Method = "GET";
            request.ContentType = "text/html;charset=UTF-8";
            HttpWebResponse response = request.GetResponse() as HttpWebResponse;
            Stream responceStream = response.GetResponseStream();
            StreamReader reader = new StreamReader(responceStream,Encoding.UTF8);
            string result = reader.ReadToEnd();
            responceStream.Close();
            reader.Close();
            return result;
        }
    }
View Code
这个是我自己修改的获取token为了不让调用token的api到达每日最高次数，使用的时候需要改下xml配置文件的路径，附上路径xml文档
  public class WeiXinHelper
    {
        /// <summary>
        /// 通过appID和appsecret获取Access_token
        /// </summary>
        /// <returns></returns>
        public static string GetAccess_token()
        {
            string AccessToken = "";

            //获取配置文件中存好的accesstoken和有效时间
            // 读取XML文件中的数据，并显示出来 ，注意文件路径  
            // StreamReader str = new StreamReader(filepath, System.Text.Encoding.UTF8);
            XmlDocument xml = new XmlDocument();
            //xml.Load(@"D:weixinWebSite1WeiXinDemo	oken.xml");
            xml.Load(@"D:我的工作备注WebSite1WeiXinDemo	oken.xml");
            DateTime tokenTime = Convert.ToDateTime(xml.DocumentElement.SelectSingleNode("token_time").InnerText);

            if (DateTime.Now > tokenTime)
            {
                string appid = ConfigurationManager.AppSettings["appid"];
                string appsecret = ConfigurationManager.AppSettings["appsecret"];
                string url = string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", appid, appsecret);
                string AccessTokenList = GetPage(url, "");
                accessToken act = JsonHelper.JsonDeSerializer<accessToken>(AccessTokenList);
                xml.DocumentElement.SelectSingleNode("token_time").InnerText = DateTime.Now.AddHours(2).ToString();
                xml.DocumentElement.SelectSingleNode("access_token").InnerText = act.access_token;
                // xml.Save(@"D:weixinWebSite1WeiXinDemo	oken.xml");
                xml.Save(@"D:我的工作备注WebSite1WeiXinDemo	oken.xml");
            }
            AccessToken = xml.DocumentElement.SelectSingleNode("access_token").InnerText;
            return AccessToken;



        }

        /// <summary>
        /// 获取网页授权之后的token信息
        /// </summary>
        /// <returns></returns>
        public static codeResult GetAccess_token_sq(string code)
        {
            codeResult codeInfo = new codeResult();

            //获取配置文件中存好的accesstoken和有效时间
            // 读取XML文件中的数据，并显示出来 ，注意文件路径  
            // StreamReader str = new StreamReader(filepath, System.Text.Encoding.UTF8);
            XmlDocument xml = new XmlDocument();
            //xml.Load(@"D:weixinWebSite1WeiXinDemo	oken.xml");
            xml.Load(@"D:我的工作备注WebSite1WeiXinDemo	oken.xml");
            DateTime tokenTime = Convert.ToDateTime(xml.DocumentElement.SelectSingleNode("token_time_sq").InnerText);

            if (DateTime.Now > tokenTime)
            {

                string appid = ConfigurationManager.AppSettings["appid"];
                string appsecret = ConfigurationManager.AppSettings["appsecret"];
                string url = string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code", appid, appsecret, code);
                string info = HttpHelper.HttpGet(url);
                codeInfo = JsonHelper.JsonDeSerializer<codeResult>(info);
                xml.DocumentElement.SelectSingleNode("token_time_sq").InnerText = DateTime.Now.AddHours(2).ToString();
                xml.DocumentElement.SelectSingleNode("access_token_sq").InnerText = codeInfo.access_token;
                xml.DocumentElement.SelectSingleNode("refresh_token").InnerText = codeInfo.refresh_token;
                xml.DocumentElement.SelectSingleNode("openid").InnerText = codeInfo.openid;
                xml.DocumentElement.SelectSingleNode("scope").InnerText = codeInfo.scope;
                // xml.Save(@"D:weixinWebSite1WeiXinDemo	oken.xml");
                xml.Save(@"D:我的工作备注WebSite1WeiXinDemo	oken.xml");

            }
            else
            {
                codeInfo.access_token = xml.DocumentElement.SelectSingleNode("access_token_sq").InnerText;
                codeInfo.refresh_token = xml.DocumentElement.SelectSingleNode("refresh_token").InnerText;
                codeInfo.openid = xml.DocumentElement.SelectSingleNode("openid").InnerText;
                codeInfo.scope = xml.DocumentElement.SelectSingleNode("scope").InnerText;

            }

            return codeInfo;

        }
        public static string GetPage(string posturl, string postData)
        {
            Stream outstream = null;
            Stream instream = null;
            StreamReader sr = null;
            HttpWebResponse response = null;
            HttpWebRequest request = null;
            Encoding encoding = Encoding.UTF8;
            byte[] data = encoding.GetBytes(postData);
            // 准备请求... 
            try
            {
                // 设置参数 
                request = WebRequest.Create(posturl) as HttpWebRequest;
                CookieContainer cookieContainer = new CookieContainer();
                request.CookieContainer = cookieContainer;
                request.AllowAutoRedirect = true;
                request.Method = "POST";
                request.ContentType = "application/x-www-form-urlencoded";
                request.ContentLength = data.Length;
                outstream = request.GetRequestStream();
                outstream.Write(data, 0, data.Length);
                outstream.Close();
                //发送请求并获取相应回应数据 
                response = request.GetResponse() as HttpWebResponse;
                //直到request.GetResponse()程序才开始向目标网页发送Post请求 
                instream = response.GetResponseStream();
                sr = new StreamReader(instream, encoding);
                //返回结果网页（html）代码 
                string content = sr.ReadToEnd();
                string err = string.Empty;
                return content;
            }
            catch (Exception ex)
            {


                return string.Empty;
            }
        }

    }
View Code
所涉及的类
所涉及到的类
 public class codeResult
    {
        public string access_token;
        public string expires_in;
        public string refresh_token;
        public string openid;
        public string scope;
    }

 public class JsonHelper
    {

        public static string JsonSerializer<T>(T t)
        {
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
            using (MemoryStream ms = new MemoryStream())
            {
                ser.WriteObject(ms, t);
                string jsonString = Encoding.UTF8.GetString(ms.ToArray());
                return jsonString;
            } 
        }
        // 从一个Json串生成对象信息
        public static T JsonDeSerializer<T>(string json)
        {
           DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(T));
           using(MemoryStream mStream = new MemoryStream(Encoding.UTF8.GetBytes(json)))
           {
               return (T)serializer.ReadObject(mStream);
           } 
        } 
    }

 [Serializable]
    public class accessToken
    {
        public string access_token;
        public string expires_in;
    }
View Code
webConfig的appId和appsecret
<appSettings>
    <add key="appId" value="wx44bc......d905d" />
    <add key="appsecret" value="2328cb.......13f7764a604a9" />
 </appSettings>
View Code
<?xml version="1.0" encoding="utf-8"?>
<xml>
  <access_token>xpcdR9i1KEYXpZRfA3YG3sap-MKGASjCAtNvb-kt9b8HJUWYWynUZ2K6oAHjNUmx-cwwkoDhHN2ajVdzr-twATldqlXwaFJ0VOYiABAEXH</access_token>
  <token_time>2017/2/13 18:16:41</token_time>
  <!--网页授权之后的token-->
  <access_token_sq>yIc4JI3qK09mPavE8opJmd4rLnOmx0WLcmAGx4-WptfEXf9CMXBVrrboCyWQqCOUll2Dv_fA</access_token_sq>
  <token_time_sq>2017/2/13 18:03:12</token_time_sq>
  <refresh_token>d_fticIKUu22Gk4grCZEIw3M7x47umIUAZ1Ss9lf-TMKXChrFHzRigAVGEE1qTv_PF41XFcVULWW4Ydg5-cHW51o</refresh_token>
  <openid>ohCfnwE0QhJzxbd2-qPMzk</openid>
  <scope>snsapi_userinfo</scope>
</xml>
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原文地址：https://www.cnblogs.com/WangJunZzz/p/6396135.html