微信分享

    /// <summary>
    /// 获取微信分享接口信息
    /// </summary>
    private void GetWxApiInfo()
    {
       string appId = ""; //微信分享APPID 
       string secret = ""; //公众号的应用秘钥
       string timestamp = string.Empty; //生成签名的时间戳
       string nonceStr = string.Empty; //必填，生成签名的随机串
       string signature = string.Empty;//必填，签名
       string strImg = string.Empty; //分享图片logo
       string strDesc = string.Empty; //微信分享描述信息
       string pageurl = string.Empty; //分享链接
        

        //生成签名的时间戳  
        TimeSpan ts = DateTime.Now - DateTime.Parse("1970-01-01 00:00:00");
        timestamp = ts.TotalSeconds.ToString().Split('.')[0];

        //生成签名的随机串  
        nonceStr = GetRandomString(16, true, true, true, false, "win");

        string token = string.Empty;

        //if (string.IsNullOrWhiteSpace(token))
        //{
        //    //微信access_token，用于获取微信jsapi_ticket      
        //    token = GetAccess_token(appId, secret);

        //    ICore.ICaching.SetCaching("token", token, 60);
        //}

        //微信jsapi_ticket    
        string ticket = ICore.ICaching.GetCaching("ticket");
        //ticket = null;
        if(string.IsNullOrWhiteSpace(ticket))
        {
            //微信access_token，用于获取微信jsapi_ticket      
            token = GetAccess_token(appId, secret);

            //微信jsapi_ticket    
            ticket = GetTicket(token);

            ICore.ICaching.SetCaching("ticket", ticket, 60);
        }
       

        //对所有待签名参数按照字段名的ASCII 码从小到大排序（字典序）后，使用URL键值对的格式（即key1=value1&key2=value2…）拼接成字符串  
        string str = "jsapi_ticket=" + ticket + "&noncestr=" + nonceStr + "&timestamp=" + timestamp + "&url=" + pageurl;

        //签名,使用SHA1生成  
        signature = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "SHA1").ToLower();  

    }

    ///<summary>
    ///生成随机字符串 
    ///</summary>
    ///<param name="length">目标字符串的长度</param>
    ///<param name="useNum">是否包含数字，1=包含，默认为包含</param>
    ///<param name="useLow">是否包含小写字母，1=包含，默认为包含</param>
    ///<param name="useUpp">是否包含大写字母，1=包含，默认为包含</param>
    ///<param name="useSpe">是否包含特殊字符，1=包含，默认为不包含</param>
    ///<param name="custom">要包含的自定义字符，直接输入要包含的字符列表</param>
    ///<returns>指定长度的随机字符串</returns>
    public string GetRandomString(int length, bool useNum, bool useLow, bool useUpp, bool useSpe, string custom)
    {
        byte[] b = new byte[4];
        new System.Security.Cryptography.RNGCryptoServiceProvider().GetBytes(b);
        Random r = new Random(BitConverter.ToInt32(b, 0));
        string s = null, str = custom;
        if (useNum == true) { str += "0123456789"; }
        if (useLow == true) { str += "abcdefghijklmnopqrstuvwxyz"; }
        if (useUpp == true) { str += "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; }
        if (useSpe == true) { str += "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~"; }
        for (int i = 0; i < length; i++)
        {
            s += str.Substring(r.Next(0, str.Length - 1), 1);
        }
        return s;
    } 


    /// <summary>  
    /// 获取微信jsapi_ticket  
    /// </summary>  
    /// <param name="token">access_token</param>  
    /// <returns>jsapi_ticket</returns>  
    public string GetTicket(string token)
    {
        string ticketUrl = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=" + token + "&type=jsapi";
        string jsonresult = HttpGet(ticketUrl, "UTF-8");
        WX_Ticket wxTicket = JsonDeserialize<WX_Ticket>(jsonresult);
        return wxTicket.ticket;
    }

    /// <summary>  
    /// 获取微信access_token  
    /// </summary>  
    /// <param name="appid">公众号的应用ID</param>  
    /// <param name="secret">公众号的应用密钥</param>  
    /// <returns>access_token</returns>  
    private string GetAccess_token(string appid, string secret)
    {
        string tokenUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appid + "&secret=" + secret;
        string jsonresult = HttpGet(tokenUrl, "UTF-8");
        WX_Token wx = JsonDeserialize<WX_Token>(jsonresult);
        return wx.access_token;
    }

    /// <summary>  
    /// JSON反序列化  
    /// </summary>  
    /// <typeparam name="T">实体类</typeparam>  
    /// <param name="jsonString">JSON</param>  
    /// <returns>实体类</returns>  
    private T JsonDeserialize<T>(string jsonString)
    {
        DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
        MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
        T obj = (T)ser.ReadObject(ms);
        return obj;
    }

    /// <summary>  
    /// HttpGET请求  
    /// </summary>  
    /// <param name="url">请求地址</param>  
    /// <param name="encode">编码方式：GB2312/UTF-8</param>  
    /// <returns>字符串</returns>  
    private string HttpGet(string url, string encode)
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.Method = "GET";
        request.ContentType = "text/html;charset=" + encode;
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Stream myResponseStream = response.GetResponseStream();
        StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding(encode));
        string retString = myStreamReader.ReadToEnd();
        myStreamReader.Close();
        myResponseStream.Close();

        return retString;
    }
        /// <summary>  
    /// 通过微信API获取access_token得到的JSON反序列化后的实体  
    /// </summary>  
    public class WX_Token
    {
        public string access_token { get; set; }
        public string expires_in { get; set; }
    }

    /// <summary>  
    /// 通过微信API获取jsapi_ticket得到的JSON反序列化后的实体  
    /// </summary>  
    public class WX_Ticket
    {
        public string errcode { get; set; }
        public string errmsg { get; set; }
        public string ticket { get; set; }
        public string expires_in { get; set; }
    } 
 

前端页面：
需要引用js
<script type="text/javascript" src="http://res.wx.qq.com/open/js/jweixin-1.2.0.js"></script>

    wx.config({
        debug: false, // 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。
        appId: '<%=appId%>', // 必填，公众号的唯一标识
        timestamp: '<%=timestamp%>', // 必填，生成签名的时间戳
        nonceStr: '<%=nonceStr%>', // 必填，生成签名的随机串 
        signature: '<%=signature%>', // 必填，签名
        jsApiList: ['onMenuShareTimeline', 'onMenuShareAppMessage', 'onMenuShareQQ', 'onMenuShareWeibo']// 必填，需要使用的JS接口列表，所有JS接口列表见附录2
    })

    wx.ready(function () {
        //分享到朋友圈
        wx.onMenuShareTimeline({
            title: '<%=title%>', // 分享标题
            link: '<%=pageurl%>', // 分享链接
            imgUrl: '<%=strImg%>', // 分享图标
            success: function () {
                
                // 用户确认分享后执行的回调函数
            },
            cancel: function () {
               
                // 用户取消分享后执行的回调函数
            }
        });
        //分享给朋友
        wx.onMenuShareAppMessage({
            title: '<%=title%>', // 分享标题
            desc: '<%=strDesc%>', // 分享描述
            link: '<%=pageurl%>', // 分享链接
            imgUrl: '<%=strImg%>', // 分享图标
            type: '', // 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
            },
            cancel: function () {
                
                // 用户取消分享后执行的回调函数
            }
        });
        //分享给QQ好友
        wx.onMenuShareQQ({
            title: '<%=title%>', // 分享标题
            desc: '<%=strDesc%>', // 分享描述
            link: '<%=pageurl%>', // 分享链接
            imgUrl: '<%=strImg%>', // 分享图标
            success: function () {
               
                // 用户确认分享后执行的回调函数
            },
            cancel: function () {
               
                // 用户取消分享后执行的回调函数
            }
        });
        //分享到腾讯微博
        wx.onMenuShareWeibo({
            title: '<%=title%>', // 分享标题
            desc: '<%=strDesc%>', // 分享描述
            link: '<%=pageurl%>', // 分享链接
            imgUrl: '<%=strImg%>', // 分享图标
            success: function () {
              
                // 用户确认分享后执行的回调函数
            },
            cancel: function () {
              
                // 用户取消分享后执行的回调函数
            }
        });
    });

注意事项：前台链接地址和后台加密的链接地址必须一样