C# 实现微信自定义分享

目录

需求与调整

代码实现

获取令牌

生成合法票据

获取有效签名

客户端准备 

客户端实现

小结

需求与调整

在微信中打开网页应用后，可以选择将地址发送给朋友进行分享，如下图：

在实际的应用中，我们可能不是简单的将该网页的链接直接分享出去，而是生成符合实际需要的URL，微信称其为自定义分享。意思即，在用户点击“转发给朋友”按钮之前，进行URL等内容的更新 ，经过调整后，再把链接发送给要分享的朋友。微信给出的关键方法是：updateAppMessageShareData。

需要注意的是：

最好不要再使用 wx.onMenuShareTimeline、wx.onMenuShareAppMessage、wx.onMenuShareQQ、wx.onMenuShareQZone 接口，请尽快迁移使用客户端6.7.2及JSSDK 1.4.0以上版本而支持 wx.updateAppMessageShareData、wx.updateTimelineShareData接口。

代码实现

获取令牌

获取令牌是调用API的基础，请提供合法的APPID和APPSECRET，示例代码如下：

        public string GetAccessToken()        {            string accessToken = "";            //获取配置信息Datatable            string respText = "";            //获取appid和appsercret            string wechat_appid = "";            string wechat_appsecret = "";            //获取josn数据            string getAccessTokenUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}";            string url = string.Format(getAccessTokenUrl, wechat_appid, wechat_appsecret);            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);            HttpWebResponse response = (HttpWebResponse)request.GetResponse();            using (Stream resStream = response.GetResponseStream())            {                StreamReader reader = new StreamReader(resStream, Encoding.Default);                respText = reader.ReadToEnd();                resStream.Close();            }            JavaScriptSerializer Jss = new JavaScriptSerializer();            Dictionary<string, object> respDic = (Dictionary<string, object>)Jss.DeserializeObject(respText);            //通过键access_token获取值            try            {                accessToken = respDic["access_token"].ToString();            }            catch (Exception e)            {                accessToken =e.Message;            }            return accessToken;        }

生成合法票据

正式调用前需要生成合法的票据，C#示例代码如下：

        public string getJsapi_ticket(string accessToken)        {            string content = "";            try            {                string url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=" + accessToken + "&type=jsapi";                string method = "GET";                HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;                CookieContainer cookieContainer = new CookieContainer();                request.CookieContainer = cookieContainer;                request.AllowAutoRedirect = true;                request.Method = method;                request.ContentType = "text/html";                request.Headers.Add("charset", "utf-8");                //发送请求并获取响应数据                HttpWebResponse response = request.GetResponse() as HttpWebResponse;                Stream responseStream = response.GetResponseStream();                StreamReader sr = new StreamReader(responseStream, Encoding.UTF8);                //获取返回过来的结果                content = sr.ReadToEnd();                dynamic resultStr = JsonConvert.DeserializeObject(content, new { errcode = "", errmsg = "", ticket = "", expires_in = "" }.GetType());                //请求成功                if (resultStr.errcode == "0" && resultStr.errmsg == "ok")                {                    content = resultStr.ticket;                }                else                {                    content = "";                }                return content;            }            catch (Exception ex)            {                content = ex.Message;                return content;            }        }

获取有效签名

通过获取成功的票据信息，生成有效签名后，就可以在客户端进行调用及分享了，示例代码如下：

            public static string GetMD5(string encypStr, string charset)            {                string retStr;                MD5CryptoServiceProvider m5 = new MD5CryptoServiceProvider();                //创建md5对象                byte[] inputBye;                byte[] outputBye;                //使用GB2312编码方式把字符串转化为字节数组．                try                {                    inputBye = Encoding.GetEncoding(charset).GetBytes(encypStr);                }                catch (Exception ex)                {                    inputBye = Encoding.GetEncoding("GB2312").GetBytes(encypStr);                }                outputBye = m5.ComputeHash(inputBye);                retStr = System.BitConverter.ToString(outputBye);                retStr = retStr.Replace("-", "").ToUpper();                return retStr;            }                /// <summary>                /// 随机串                /// </summary>                public string getNoncestr()                {                    Random random = new Random();                    return GetMD5(random.Next(1000).ToString(), "GBK").ToLower().Replace("s", "S");                }                /// <summary>                /// 时间截，自1970年以来的秒数                /// </summary>                public  string getTimestamp()                {                    TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);                    return Convert.ToInt64(ts.TotalSeconds).ToString();                }        /// <summary>        /// 签名加密，使用SHA加密所得        /// </summary>        /// <param name="content">签名加密参数</param>        /// <param name="encode">编码UTF-8</param>        /// <returns></returns>        public string Sha1(string content, Encoding encode)        {            try            {                SHA1 sha1 = new SHA1CryptoServiceProvider();                byte[] bytesIn = encode.GetBytes(content);                byte[] bytesOut = sha1.ComputeHash(bytesIn);                sha1.Dispose();                string result = BitConverter.ToString(bytesOut);                result = result.Replace("-", "");                return result;            }            catch (Exception ex)            {                throw new Exception("SHA1加密出错：" + ex.Message);            }        }        /// <summary>        /// 获取签名        /// </summary>        /// <param name="jsapi_ticket">