c# 调用微信小程序

//微信也不给个c#调用的例子 只好自己造咯；ps:大佬勿喷
 1 public string GetWx(string code, string iv, string encryptedData)
        {
            // context.Response.ContentType = "text/plain";
            string xx = "";
            try
            {
                //code = HttpContext.Current.Request.QueryString["code"].ToString();
                //iv = HttpContext.Current.Request.QueryString["iv"].ToString();
                //encryptedData = HttpContext.Current.Request.QueryString["encryptedData"].ToString();
            }
            catch (Exception ex)
            {
                //  context.Response.Write(ex.ToString());
            }

            string Appid = "wx187bd36d7393af6b";
            string Secret = "8f14745e1dd01cedbdcac790aa397149";
            string grant_type = "authorization_code";

            //向微信服务端 使用登录凭证 code 获取 session_key 和 openid  
            string url = "https://api.weixin.qq.com/sns/jscode2session?appid=" + Appid + "&secret=" + Secret + "&js_code=" + code + "&grant_type=" + grant_type;
            string type = "utf-8";

            GetUsersHelper GetUsersHelper = new GetUsersHelper();
            string j = GetUsersHelper.GetUrltoHtml(url, type);//获取微信服务器返回字符串 

            //将字符串转换为json格式 
            JObject jo = (JObject)JsonConvert.DeserializeObject(j);

            result res = new result();
            try
            {
                //微信服务器验证成功 
                res.openid = jo["openid"].ToString();
                res.session_key = jo["session_key"].ToString();
            }
            catch (Exception)
            {
                //微信服务器验证失败 
                res.errcode = jo["errcode"].ToString();
                res.errmsg = jo["errmsg"].ToString();
            }
            return res.openid;
        }

        public class GetUsersHelper
        {

            /// <summary> 
            /// 获取链接返回数据 
            /// </summary> 
            /// <param name="Url">链接</param> 
            /// <param name="type">请求类型</param> 
            /// <returns></returns> 
            public string GetUrltoHtml(string Url, string type)
            {
                try
                {
                    System.Net.WebRequest wReq = System.Net.WebRequest.Create(Url);
                    // Get the response instance. 
                    System.Net.WebResponse wResp = wReq.GetResponse();
                    System.IO.Stream respStream = wResp.GetResponseStream();
                    // Dim reader As StreamReader = New StreamReader(respStream) 
                    using (System.IO.StreamReader reader = new System.IO.StreamReader(respStream, Encoding.GetEncoding(type)))
                    {
                        return reader.ReadToEnd();
                    }
                }
                catch (System.Exception ex)
                {
                    return ex.Message;
                }
            }

 #region 微信小程序用户数据解密

            public static string AesKey;
            public static string AesIV;

            /// <summary> 
            /// AES解密 
            /// </summary> 
            /// <param name="inputdata">输入的数据encryptedData</param> 
            /// <param name="AesKey">key</param> 
            /// <param name="AesIV">向量128</param> 
            /// <returns name="result">解密后的字符串</returns> 
            public string AESDecrypt(string inputdata)
            {
                try
                {
                    AesIV = AesIV.Replace(" ", "+");
                    AesKey = AesKey.Replace(" ", "+");
                    inputdata = inputdata.Replace(" ", "+");
                    byte[] encryptedData = Convert.FromBase64String(inputdata);

                    RijndaelManaged rijndaelCipher = new RijndaelManaged();
                    rijndaelCipher.Key = Convert.FromBase64String(AesKey); // Encoding.UTF8.GetBytes(AesKey); 
                    rijndaelCipher.IV = Convert.FromBase64String(AesIV);// Encoding.UTF8.GetBytes(AesIV); 
                    rijndaelCipher.Mode = CipherMode.CBC;
                    rijndaelCipher.Padding = PaddingMode.PKCS7;
                    ICryptoTransform transform = rijndaelCipher.CreateDecryptor();
                    byte[] plainText = transform.TransformFinalBlock(encryptedData, 0, encryptedData.Length);
                    string result = Encoding.UTF8.GetString(plainText);

                    return result;
                }
                catch (Exception)
                {
                    return null;

                }
            }

            /// <summary>  
            /// 根据微信小程序平台提供的解密算法解密数据  
            /// </summary>  
            /// <param name="encryptedData">加密数据</param>  
            /// <param name="iv">初始向量</param>  
            /// <param name="sessionKey">从服务端获取的SessionKey</param>  
            /// <returns></returns>  
            public userInfo Decrypt(string encryptedData, string iv, string sessionKey)
            {
                userInfo userInfo;
                //创建解密器生成工具实例  
                AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
                //设置解密器参数  
                aes.Mode = CipherMode.CBC;
                aes.BlockSize = 128;
                aes.Padding = PaddingMode.PKCS7;
                //格式化待处理字符串  
                byte[] byte_encryptedData = Convert.FromBase64String(encryptedData);
                byte[] byte_iv = Convert.FromBase64String(iv);
                byte[] byte_sessionKey = Convert.FromBase64String(sessionKey);

                aes.IV = byte_iv;
                aes.Key = byte_sessionKey;
                //根据设置好的数据生成解密器实例  
                ICryptoTransform transform = aes.CreateDecryptor();

                //解密  
                byte[] final = transform.TransformFinalBlock(byte_encryptedData, 0, byte_encryptedData.Length);

                //生成结果  
                string result = Encoding.UTF8.GetString(final);

                //反序列化结果，生成用户信息实例  
                userInfo = JsonConvert.DeserializeObject<userInfo>(result);

                return userInfo;

            }


            #endregion
        }



        public class wechat
        {
        }
        #region 实体类
        /// <summary>  
        /// 微信用户类  
        /// </summary>  
        public class userInfo
        {
            public string openId { get; set; }
            public string nickName { get; set; }
            public string gender { get; set; }
            public string city { get; set; }
            public string province { get; set; }
            public string country { get; set; }
            public string avatarUrl { get; set; }
            public string unionId { get; set; }
            public data watermark { get; set; }
        }
        /// <summary>  
        /// 微信用户数据水印  
        /// </summary>  
        public class data
        {
            public string appid { get; set; }
            public string timestamp { get; set; }
        }
        /// <summary>  
        /// 微信小程序验证返回结果  
        /// </summary>  
        public class result
        {
            public string openid { get; set; }
            public string session_key { get; set; }
            public string errcode { get; set; }
            public string errmsg { get; set; }
        }
        #endregion