/*因为官方 微信 JSSDK 只有PHP java版本的 我自己照着PHP的翻译过来的，可供参考。欢迎指正*/  
[csharp] view plaincopy在CODE上查看代码片派生到我的代码片
using System;  
using System.Collections.Generic;  
using System.Web;  
using System.IO;  
using System.Security.Cryptography;  
  
  
using System.Runtime.Serialization.Json;  
using System.Runtime.Serialization;  
using System.Net;  
using System.Runtime.Serialization.Formatters.Binary;  
using System.Text;  
  
  
namespace JSSDK.Models  
{  
    public class JSSDK  
    {  
        private string appId;  
        private string appSecret;  
  
  
        public JSSDK(string appId, string appSecret)  
        {  
            this.appId = appId;  
            this.appSecret = appSecret;  
        }  
  
  
        //创建Json序列化 及反序列化类目  
        #region  
        //创建JSon类 保存文件 jsapi_ticket.json  
        [DataContract(Namespace = "http://coderzh.cnblogs.com")]  
        class JSTicket  
        {  
            [DataMember(Order = 0)]  
            public string jsapi_ticket { get; set; }  
            [DataMember(Order = 1)]  
            public double expire_time { get; set; }  
        }  
        //创建 JSon类 保存文件 access_token.json  
        [DataContract(Namespace = "http://coderzh.cnblogs.com")]  
        class AccToken  
        {  
            [DataMember(Order = 0)]  
            public string access_token { get; set; }  
            [DataMember(Order = 1)]  
            public double expire_time { get; set; }  
        }  
  
  
        //创建从微信返回结果的一个类 用于获取ticket  
        [DataContract(Namespace = "http://coderzh.cnblogs.com")]  
        class Jsapi  
        {  
            [DataMember(Order = 0)]  
            public int errcode { get; set; }  
            [DataMember(Order = 1)]  
            public string errmsg { get; set; }  
            [DataMember(Order = 2)]  
            public string ticket { get; set; }  
            [DataMember(Order = 3)]  
            public string expires_in { get; set; }  
        }  
        #endregion  
  
  
        //得到数据包，返回使用页面  
        public System.Collections.Hashtable getSignPackage()  
        {  
             
  
  
            string jsapiTicket = getJsApiTicket();  
            string url = HttpContext.Current.Request.Url.ToString(); //"http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";  
            string timestamp = Convert.ToString(ConvertDateTimeInt(DateTime.Now));  
            string nonceStr = createNonceStr();  
  
  
            // 这里参数的顺序要按照 key 值 ASCII 码升序排序  
            string rawstring = "jsapi_ticket=" + jsapiTicket + "&noncestr=" + nonceStr + "&timestamp=" + timestamp + "&url=" + url + "";  
  
  
            string signature = SHA1_Hash(rawstring);  
  
  
            System.Collections.Hashtable signPackage = new System.Collections.Hashtable();  
            signPackage.Add("appId", appId);  
            signPackage.Add("nonceStr", nonceStr);  
            signPackage.Add("timestamp", timestamp);  
            signPackage.Add("url", url);  
            signPackage.Add("signature", signature);  
            signPackage.Add("rawString", rawstring);  
  
  
            return signPackage;  
        }  
  
  
        //创建随机字符串  
        private string createNonceStr()  
        {  
  
  
            int length = 16;  
            string chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";  
            string str = "";  
            Random rad = new Random();  
            for (int i = 0; i < length; i++)  
            {  
                str += chars.Substring(rad.Next(0, chars.Length - 1), 1);  
            }  
            return str;  
        }  
  
  
        //得到ticket 如果文件里时间 超时则重新获取  
        private string getJsApiTicket()  
        {  
            // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例  
            string path =HttpContext.Current.Server.MapPath(@"/jssdk/jsapi_ticket.json");  
              
            //读取文件         
            FileStream file = new FileStream(path, FileMode.Open);  
            var serializer = new DataContractJsonSerializer(typeof(JSTicket));  
            JSTicket readJSTicket = (JSTicket)serializer.ReadObject(file);  
            file.Close();  
            string ticket = "";  
            if (readJSTicket.expire_time < ConvertDateTimeInt(DateTime.Now))  
            {  
                string accessToken = getAccessToken();  
                string url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=" + accessToken + "";  
                Jsapi api = Desrialize<Jsapi>(new Jsapi(), httpGet(url));  
  
  
  
  
                ticket = api.ticket;  
                if (ticket != "")  
                {  
                    readJSTicket.expire_time = ConvertDateTimeInt(DateTime.Now) + 7000;  
                    readJSTicket.jsapi_ticket = ticket;  
  
  
                    string json = Serialize<JSTicket>(readJSTicket);  
                    StreamWriterMetod(json, path);  
                }  
            }  
            else  
            {  
                ticket = readJSTicket.jsapi_ticket;  
            }  
  
  
            return ticket;  
        }  
  
  
        //得到accesstoken 如果文件里时间 超时则重新获取  
        private string getAccessToken()  
        {  
            // access_token 应该全局存储与更新，以下代码以写入到文件中做示例  
  
  
            string access_token = "";  
            string path = HttpContext.Current.Server.MapPath(@"/jssdk/access_token.json");             
            FileStream file = new FileStream(path, FileMode.Open);  
            var serializer = new DataContractJsonSerializer(typeof(AccToken));  
            AccToken readJSTicket = (AccToken)serializer.ReadObject(file);  
            file.Close();  
            if (readJSTicket.expire_time < ConvertDateTimeInt(DateTime.Now))  
            {  
                string url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appId + "&secret=" + appSecret + "";  
  
  
                AccToken iden = Desrialize<AccToken>(new AccToken(), httpGet(url));  
  
  
                access_token = iden.access_token;  
                if (access_token != "")  
                {  
                    iden.expire_time = ConvertDateTimeInt(DateTime.Now) + 7000;  
                    iden.access_token = access_token;  
  
  
                    string json = Serialize<AccToken>(iden);  
                    StreamWriterMetod(json, path);  
                }  
            }  
            else  
            {  
                access_token = readJSTicket.access_token;  
            }  
            return access_token;  
        }  
  
  
        //发起一个http请球，返回值  
        private string httpGet(string url)  
        {  
               try {  
  
  
        WebClient MyWebClient = new WebClient();  
  
  
          
        MyWebClient.Credentials = CredentialCache.DefaultCredentials;//获取或设置用于向Internet资源的请求进行身份验证的网络凭据  
  
  
        Byte[] pageData = MyWebClient.DownloadData(url); //从指定网站下载数据  
  
  
        string pageHtml = System.Text.Encoding.Default.GetString(pageData);  //如果获取网站页面采用的是GB2312，则使用这句              
  
  
        //string pageHtml = Encoding.UTF8.GetString(pageData); //如果获取网站页面采用的是UTF-8，则使用这句  
  
  
        return pageHtml;     
  
  
    }  
  
  
    catch(WebException webEx) {  
  
  
        Console.WriteLine(webEx.Message.ToString());  
        return null;  
    }  
        }  
  
  
        //SHA1哈希加密算法  
        public string SHA1_Hash(string str_sha1_in)  
        {  
            SHA1 sha1 = new SHA1CryptoServiceProvider();  
            byte[] bytes_sha1_in = System.Text.UTF8Encoding.Default.GetBytes(str_sha1_in);  
            byte[] bytes_sha1_out = sha1.ComputeHash(bytes_sha1_in);  
            string str_sha1_out = BitConverter.ToString(bytes_sha1_out);  
            str_sha1_out = str_sha1_out.Replace("-", "").ToLower();  
            return str_sha1_out;  
        }  
  
  
        /// <summary>  
        /// StreamWriter写入文件方法  
        /// </summary>  
        private void StreamWriterMetod(string str, string patch)  
        {  
            try  
            {  
                FileStream fsFile = new FileStream(patch, FileMode.OpenOrCreate);  
                StreamWriter swWriter = new StreamWriter(fsFile);  
                //寫入數據  
                swWriter.WriteLine(str);  
                swWriter.Close();  
            }  
            catch (Exception e)  
            {  
                throw e;  
            }  
        }  
  
  
        /// <summary>  
        /// 反序列化 字符串到对象  
        /// </summary>  
        /// <param name="obj">泛型对象</param>  
        /// <param name="str">要转换为对象的字符串</param>  
        /// <returns>反序列化出来的对象</returns>  
        public static T Desrialize<T>(T obj, string str)  
        {  
            try  
            {  
                var mStream = new MemoryStream(Encoding.Default.GetBytes(str));  
                var serializer = new DataContractJsonSerializer(typeof(T));  
                T readT = (T)serializer.ReadObject(mStream);  
  
  
                return readT;  
            }  
            catch (Exception ex)  
            {  
                return default(T);  
                throw new Exception("反序列化失败,原因:" + ex.Message);              
            }  
             
        }  
  
  
        /// <summary>  
        /// 序列化 对象到字符串  
        /// </summary>  
        /// <param name="obj">泛型对象</param>  
        /// <returns>序列化后的字符串</returns>  
        public static string Serialize<T>(T obj)  
        {  
            try  
            {  
                var serializer = new DataContractJsonSerializer(typeof(T));  
                var stream = new MemoryStream();  
                serializer.WriteObject(stream, obj);  
  
  
                byte[] dataBytes = new byte[stream.Length];  
  
  
                stream.Position = 0;  
  
  
                stream.Read(dataBytes, 0, (int)stream.Length);  
  
  
                string dataString = Encoding.UTF8.GetString(dataBytes);  
                return dataString;  
            }  
            catch (Exception ex)  
            {  
                return null;  
                throw new Exception("序列化失败,原因:" + ex.Message);  
            }  
        }  
  
  
  
  
        /// <summary>  
        /// 将c# DateTime时间格式转换为Unix时间戳格式  
        /// </summary>  
        /// <param name="time">时间</param>  
        /// <returns>double</returns>  
        public int ConvertDateTimeInt(System.DateTime time)  
        {  
            int intResult = 0;  
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));  
            intResult = Convert.ToInt32((time - startTime).TotalSeconds);  
            return intResult;  
        }  
    }  
}