C# 点击按钮分享公众号给好友

最近客户提了个需求，在移动端首页加一个按钮，点击按钮实现分享给好友。
啥也没说，先看了一篇微信开发文档：https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/JS-SDK.html

接着配置了微信公众号开发平台域名和黑白名单，引用微信js：http://res.wx.qq.com/open/js/jweixin-1.6.0.js，获取参数，调用wx接口。

前端代码：

//分享公众号
    function wx_fx() {
        wx.config({
            debug: true, // 是否开启调试模式
            appId: "{$:#.appid}",
            timestamp: '{$:#.timestamp}', //时间戳
            nonceStr: '{$:#.nonceStr}', // 随机字符串
            signature: "{$:#.signature}",//签名
            jsApiList: [
                    'onMenuShareAppMessage'
                ] // 需要使用的JS接口列表
        })
       wx.ready(function(){
 
        //分享给朋友
        wx.onMenuShareAppMessage({
          title:'分享测试', // 分享标题
            desc:'测试分享', // 分享描述
            link: 'http://xxxx.com', // 分享链接
            imgUrl: 'http://xxxx.com/templets/mobile/images/index_101.png', // 分享图标
            type:'link', // 分享类型,music、video或link，不填默认为link
            dataUrl:'', // 如果type是music或video，则要提供数据链接，默认为空
            success: function () {
                // 用户确认分享后执行的回调函数
                 alert('分享成功');
            },
            cancel: function () {
                // 用户取消分享后执行的回调函数
                  alert('取消了分享');
            }
        });
    });
 
 }
    
</script>

　后台第一步：根据Appid和秘钥appSecret获取ticket令牌

//获取ticket
      public string getJsApiTicket(string appid, string appSecret)
      {
          string ticket = string.Empty;
          if (!string.IsNullOrEmpty(appid) && !string.IsNullOrEmpty(appSecret))
          {
              //这里开始从微信API获取ticket
              string token = GetToken(appid, appSecret);
           
              string url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=wx_card&access_token=" + token + "";
              Jsapi api = JsonConvert.DeserializeObject<Jsapi>(httpGet(url));
              //FsLog.CreateLog("api:" + api, true);
              ticket = api.ticket;
              //FsLog.CreateLog("api.ticket:" + api.ticket, true);
          }
          return ticket;
      }
 
 
 
 
      // 获取access_token
      public string GetToken(string appid, string secret)
      {
          string strJson = RequestUrl(string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", appid, secret), "post");
          return GetJsonValue(strJson, "access_token");
      }

　　第二步：生成时间戳获取随机字符串

// 返回时间戳
               string timestamp = Convert.ToString(ConvertDateTimeInt(DateTime.Now));
// 返回创建随机字符串
               string nonceStr = createNonceStr();
 
       //创建随机字符串  
       public 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;
       }

　　第三步：获取签名signature，可以写错误日志在ftp上查看问题，微信js接口签名效验：http://mp.weixin.qq.com/debug/cgi-bin/sandbox?t=jsapisign

        // 返回签名signature
        string rawstring = "jsapi_ticket=" + jsapiTicket + "&noncestr=" + nonceStr + "&timestamp=" + timestamp + "&url=" + pathurl + "";
        string signature = SHA1_Hash(rawstring);
 
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;
}

public string Keyword(string Appid, string appSecret)
      {
          string json = "";
          if (!string.IsNullOrEmpty(Appid)&&!string.IsNullOrEmpty(appSecret))
          {
              //获取ticket
              string jsapiTicket = getJsApiTicket(Appid, appSecret);
              //FsLog.CreateLog("jsapiTicket:" + jsapiTicket, true);
 
              // 返回时间戳
              string timestamp = Convert.ToString(ConvertDateTimeInt(DateTime.Now));
 
              //FsLog.CreateLog("timestamp:" + timestamp, true);
 
              // 返回创建随机字符串
              string nonceStr = createNonceStr();
 
              //FsLog.CreateLog("nonceStr:" + nonceStr, true);
 
              // 返回签名signature
              string rawstring = "jsapi_ticket=" + jsapiTicket + "&noncestr=" + nonceStr + "&timestamp=" + timestamp + "&url=" + pathurl + "";
              string signature = SHA1_Hash(rawstring);
 
              //FsLog.CreateLog("signature:" + signature, true);
 
              json = timestamp + "," + nonceStr + "," + signature + "," + jsapiTicket;    
          }
          return json;
      }