.NET微信自定义分享标题、缩略图、超链接及描述的设置方法

前端Js引用：

 <script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>
    <script type="text/javascript">
        var data = '<%=JsApiirray %>';
        data = eval("(" + data + ")");//实例化
        wxconfig(data);
    </script>
    <script>
        function wxconfig(data) {
            wx.config({
                // 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。
                debug: false,
                // 必填，公众号的唯一标识
                appId: data.appId,
                // 必填，生成签名的时间戳
                timestamp: data.timestamp,
                // 必填，生成签名的随机串
                nonceStr: data.nonceStr,
                // 必填，签名
                signature: data.signature,
                // 必填，需要使用的JS接口列表
                jsApiList: [
                     'checkJsApi',
                 'onMenuShareTimeline',
               'onMenuShareAppMessage',
               'onMenuShareQQ',
                 'onMenuShareWeibo'
                ]
            });
        }
        // config信息验证后会执行ready方法，所有接口调用都必须在config接口获得结果之后，config是一个客户端的异步操作，所以如果需要在页面加载时就调用相关接口，则须把相关接口放在ready函数中调用来确保正确执行。对于用户触发时才调用的接口，则可以直接调用，不需要放在ready函数中。
        wx.ready(function () {
            wx.checkJsApi({
                jsApiList: [
                'onMenuShareTimeline',
                   'onMenuShareAppMessage',
                    'onMenuShareQQ',
                    'onMenuShareWeibo'
                ]
            });
            var title = "上海长宽神游戏“神龟不掉线”，千万别小看它！";
            var des = "我玩过了上海长宽的游戏神作“神龟不掉线”，真的比想象中更难，你快来试试并领取电影红包吧！";
            wx.onMenuShareTimeline({
                title: title, //分享标题
                link: 'http://m.gwbnsh.net.cn/sgbdx/', //分享链接
                desc: des, //分享描述
                imgUrl: 'http://m.gwbnsh.net.cn/sgbdx/img/logo.png',//分享图片地址
                trigger: function (res) {
                    //alert('用户点击分享到朋友圈');
                },
                success: function (res) {
                    $.ajax({
                        type: "POST",
                        url: "User.ashx",   //处理页的相对地址
                        data: { isshare: 1 },
                        async: true,
                        success: function (data) {
                            location = "http://m.maizuo.com/act/lucky-package/?__locate=false#!/active/NUxySmNbvQFF";
                        }
                    });
                },
                cancel: function (res) {
                    //alert('已取消');
                }
            });
            wx.onMenuShareAppMessage({
                title: title, //分享标题
                link: 'http://m.gwbnsh.net.cn/sgbdx/', //分享链接
                desc: des, //分享描述
                imgUrl: 'http://m.gwbnsh.net.cn/sgbdx/img/logo.png',//分享图片地址
                trigger: function (res) {
                    //alert('用户点击分享到朋友圈');
                },
                success: function (res) {
                    $.ajax({
                        type: "POST",
                        url: "User.ashx",   //处理页的相对地址
                        data: { isshare: 1 },
                        async: true,
                        success: function (data) {
                            location = "http://m.maizuo.com/act/lucky-package/?__locate=false#!/active/NUxySmNbvQFF";
                        }
                    });
                },
                cancel: function (res) {
                    //alert('已取消');
                }
            });
            wx.onMenuShareQQ({
                title: title, //分享标题
                link: 'http://m.gwbnsh.net.cn/sgbdx/', //分享链接
                desc: des, //分享描述
                imgUrl: 'http://m.gwbnsh.net.cn/sgbdx/img/logo.png',//分享图片地址
                trigger: function (res) {
                    //alert('用户点击分享到朋友圈');
                },
                success: function (res) {
                    $.ajax({
                        type: "POST",
                        url: "User.ashx",   //处理页的相对地址
                        data: { isshare: 1 },
                        async: true,
                        success: function (data) {
                            location = "http://m.maizuo.com/act/lucky-package/?__locate=false#!/active/NUxySmNbvQFF";
                        }
                    });
                },
                cancel: function (res) {
                    //alert('已取消');
                }
            });
            wx.onMenuShareQZone({
                title: title, //分享标题
                link: 'http://m.gwbnsh.net.cn/sgbdx/', //分享链接
                desc: des, //分享描述
                imgUrl: 'http://m.gwbnsh.net.cn/sgbdx/img/logo.png',//分享图片地址
                trigger: function (res) {
                    //alert('用户点击分享到朋友圈');
                },
                success: function (res) {
                    $.ajax({
                        type: "POST",
                        url: "User.ashx",   //处理页的相对地址
                        data: { isshare: 1 },
                        async: true,
                        success: function (data) {
                            location = "http://m.maizuo.com/act/lucky-package/?__locate=false#!/active/NUxySmNbvQFF";
                        }
                    });
                },
                cancel: function (res) {
                    //alert('已取消');
                }
            });
            wx.error(function (res) {
                // config信息验证失败会执行error函数，如签名过期导致验证失败，具体错误信息可以打开config的debug模式查看，也可以在返回的res参数中查看，对于SPA可以在这里更新签名。
                alert("errorMSG:" + res);
            });
        });
    </script>

或者

<script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>
    <script type="text/javascript">
        var data = '<%=JsApiirray %>';
        data = eval("(" + data + ")");//实例化
        wxconfig(data);
    </script>
    <script>
        function wxconfig(data) {
            wx.config({
                // 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。
                debug: false,
                // 必填，公众号的唯一标识
                appId: data.appId,
                // 必填，生成签名的时间戳
                timestamp: data.timestamp,
                // 必填，生成签名的随机串
                nonceStr: data.nonceStr,
                // 必填，签名
                signature: data.signature,
                // 必填，需要使用的JS接口列表
                jsApiList: [
                     'checkJsApi',
                 'onMenuShareTimeline',
               'onMenuShareAppMessage',
               'onMenuShareQQ',
                 'onMenuShareWeibo'
                ]
            });
        }
        /*
 * 注意：
 * 1. 所有的JS接口只能在公众号绑定的域名下调用，公众号开发者需要先登录微信公众平台进入“公众号设置”的“功能设置”里填写“JS接口安全域名”。
 * 2. 如果发现在 Android 不能分享自定义内容，请到官网下载最新的包覆盖安装，Android 自定义分享接口需升级至 6.0.2.58 版本及以上。
 * 3. 完整 JS-SDK 文档地址：http://mp.weixin.qq.com/wiki/7/1c97470084b73f8e224fe6d9bab1625b.html
 * 如有问题请通过以下渠道反馈：
 * 邮箱地址：weixin-open@qq.com
 * 邮件主题：【微信JS-SDK反馈】具体问题
 * 邮件内容说明：用简明的语言描述问题所在，并交代清楚遇到该问题的场景，可附上截屏图片，微信团队会尽快处理你的反馈。
 *config信息验证后会执行ready方法，所有接口调用都必须在config接口获得结果之后，config是一个客户端的异步操作，所以如果需要在页面加载时就调用相关接口，则须把相关接口放在ready函数中调用来确保正确执行。对于用户触发时才调用的接口，则可以直接调用，不需要放在ready函数中。
 */
        wx.ready(function () {
            wx.checkJsApi({
                jsApiList: [
                'onMenuShareTimeline',
                   'onMenuShareAppMessage',
                    'onMenuShareQQ',
                    'onMenuShareWeibo'
                ],
                success: function (res) {
                    alert(JSON.stringify(res));
                }
            });
            var shareData = {
                title: '标题',
                desc: '描述',
                link: '链接',
                imgUrl: '图片',
                trigger: function (res) {
                    alert('用户点击发送给朋友');
                },
                success: function (res) {
                    alert('已分享');
                },
                cancel: function (res) {
                    alert('已取消');
                },
                fail: function (res) {
                    alert(JSON.stringify(res));
                }
            };
            wx.onMenuShareAppMessage(shareData);
            wx.onMenuShareTimeline(shareData);
            wx.onMenuShareQQ(shareData);
            wx.onMenuShareWeibo(shareData);
        });
        wx.error(function (res) {
            // config信息验证失败会执行error函数，如签名过期导致验证失败，具体错误信息可以打开config的debug模式查看，也可以在返回的res参数中查看，对于SPA可以在这里更新签名。
            alert("errorMSG:" + res);
        });
    </script>

验证JsAPI权限配置：

#region 验证JsApi权限配置
    /// <summary>
    /// 获取JsApi权限配置的数组/四个参数
    /// </summary>
    /// <returns></returns>
    public string GetJsApiInfo(string Appid, string Appsecret)
    {
        string timestamp = CommonMethod.ConvertDateTimeInt(DateTime.Now).ToString();//生成签名的时间戳
        string nonceStr = CommonMethod.GetRandCode(16);//生成签名的随机串
        string url = System.Web.HttpContext.Current.Request.Url.AbsoluteUri.ToString();//当前的地址
        string jsapi_ticket = "";
        //ticket 缓存7200秒
        if (System.Web.HttpContext.Current.Session["jsapi_ticket"] == null)
        {
            jsapi_ticket = CommonMethod.WebRequestPostOrGet("https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=" + BasicApi.GetTokenSession(Appid, Appsecret) + "&type=jsapi", "");
            System.Web.HttpContext.Current.Session["jsapi_ticket"] = jsapi_ticket;
            System.Web.HttpContext.Current.Session.Timeout = 7200;
        }
        else
        {
            jsapi_ticket = System.Web.HttpContext.Current.Session["jsapi_ticket"].ToString();
        }
        Dictionary<string, object> respDic = (Dictionary<string, object>)Jss.DeserializeObject(jsapi_ticket);
        jsapi_ticket = respDic["ticket"].ToString();//获取ticket
        string[] ArrayList = { "jsapi_ticket=" + jsapi_ticket, "timestamp=" + timestamp, "noncestr=" + nonceStr, "url=" + url };
        Array.Sort(ArrayList);
        string signature = string.Join("&", ArrayList);
        signature = Md5Hash(signature).ToLower();
        return "{"appId":"" + Appid + "", "timestamp":" + timestamp + ","nonceStr":"" + nonceStr + "","signature":"" + signature + ""}";
    }
    /// <summary>
    /// 32位MD5加密
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    private string Md5Hash(string input)
    {
        MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();
        byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(input));
        StringBuilder sBuilder = new StringBuilder();
        for (int i = 0; i < data.Length; i++)
        {
            sBuilder.Append(data[i].ToString("x2"));
        }
        return sBuilder.ToString();
    }

    #endregion

基础接口BasicApi.cs：

using System.Collections.Generic;
using System.Net;
using System.Text;
using System.Web;
using System.Web.Script.Serialization;
using Newtonsoft.Json.Linq;
using Newtonsoft.Json;
namespace Web
{// <summary>
    /// 基础接口
    /// </summary>
    public class BasicApi
    {
        public static string SessionAccessToken = "";//access_token缓存 其他接口的通行证

        public BasicApi() { }

        #region 获取access_token缓存
        public static string GetTokenSession(string AppID, string AppSecret)
        {
            string TokenSession = "";

            if (System.Web.HttpContext.Current.Session[SessionAccessToken] == null)
            {
                TokenSession = AddTokenSession(AppID, AppSecret);
            }
            else
            {
                TokenSession = System.Web.HttpContext.Current.Session[SessionAccessToken].ToString();
            }

            return TokenSession;
        }
        /// <summary>
        /// 添加AccessToken缓存
        /// </summary>
        /// <param name="AppID"></param>
        /// <param name="AppSecret"></param>
        /// <returns></returns>
        public static string AddTokenSession(string AppID, string AppSecret)
        {
            //获取AccessToken
            string AccessToken = GetAccessToken(AppID, AppSecret);
            HttpContext.Current.Session[SessionAccessToken] = AccessToken;
            HttpContext.Current.Session.Timeout = 7200;
            return AccessToken;
        }

        /// <summary>
        /// 获取AccessToken
        /// </summary>
        /// <param name="AppID"></param>
        /// <param name="AppSecret"></param>
        /// <returns></returns>
        public static string GetAccessToken(string AppID, string AppSecret)
        {
            JavaScriptSerializer Jss = new JavaScriptSerializer();
            string respText = CommonMethod.WebRequestPostOrGet(string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", AppID, AppSecret), "");
            Dictionary<string, object> respDic = (Dictionary<string, object>)Jss.DeserializeObject(respText);
            string accessToken = respDic["access_token"].ToString();
            return accessToken;
        }
        /// <summary>
        /// 用code换取获取用户信息（包括非关注用户的）
        /// </summary>
        /// <param name="openid"></param>
        /// <param name="access_token"></param>
        /// <returns></returns>
        public static JObject GetUserInfo(string openid, string access_token)
        {
            JavaScriptSerializer Jss = new JavaScriptSerializer();
            string url = string.Format("https://api.weixin.qq.com/cgi-bin/user/info?access_token={0}&openid={1}&lang=zh_CN", access_token, openid);
            WebClient wc = new WebClient();
            byte[] bytes = wc.DownloadData(url);
            wc.Encoding = Encoding.UTF8;
            string jsonText = Encoding.UTF8.GetString(bytes);
            JObject jo = (JObject)JsonConvert.DeserializeObject(jsonText);
            return jo;
        }
        #endregion
    }
}

通用方法CommonMethod.cs：

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Web;

namespace Web
{
    /// <summary>
    /// 通用方法类
    /// </summary>
    public class CommonMethod
    {
        #region Post/Get提交调用抓取
        /// <summary>
        /// Post/get 提交调用抓取
        /// </summary>
        /// <param name="url">提交地址</param>
        /// <param name="param">参数</param>
        /// <returns>string</returns>
        public static string WebRequestPostOrGet(string sUrl, string sParam)
        {
            byte[] bt = System.Text.Encoding.UTF8.GetBytes(sParam);

            Uri uriurl = new Uri(sUrl);
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(uriurl);//HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url + (url.IndexOf("?") > -1 ? "" : "?") + param);
            req.Method = "Post";
            req.Timeout = 120 * 1000;
            req.ContentType = "application/x-www-form-urlencoded;";
            req.ContentLength = bt.Length;

            using (Stream reqStream = req.GetRequestStream())//using 使用可以释放using段内的内存
            {
                reqStream.Write(bt, 0, bt.Length);
                reqStream.Flush();
            }
            try
            {
                using (WebResponse res = req.GetResponse())
                {
                    //在这里对接收到的页面内容进行处理 

                    Stream resStream = res.GetResponseStream();

                    StreamReader resStreamReader = new StreamReader(resStream, System.Text.Encoding.UTF8);

                    string resLine;

                    System.Text.StringBuilder resStringBuilder = new System.Text.StringBuilder();

                    while ((resLine = resStreamReader.ReadLine()) != null)
                    {
                        resStringBuilder.Append(resLine + System.Environment.NewLine);
                    }

                    resStream.Close();
                    resStreamReader.Close();

                    return resStringBuilder.ToString();
                }
            }
            catch (Exception ex)
            {
                return ex.Message;//url错误时候回报错
            }
        }
        #endregion Post/Get提交调用抓取

        #region unix/datatime 时间转换
        /// <summary>
        /// unix时间转换为datetime
        /// </summary>
        /// <param name="timeStamp"></param>
        /// <returns></returns>
        public static DateTime UnixTimeToTime(string timeStamp)
        {
            DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
            long lTime = long.Parse(timeStamp + "0000000");
            TimeSpan toNow = new TimeSpan(lTime);
            return dtStart.Add(toNow);
        }

        /// <summary>
        /// datetime转换为unixtime
        /// </summary>
        /// <param name="time"></param>
        /// <returns></returns>
        public static int ConvertDateTimeInt(System.DateTime time)
        {
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
            return (int)(time - startTime).TotalSeconds;
        }
        #endregion

        #region 记录bug，以便调试
        /// <summary>
        /// 记录bug，以便调试
        /// </summary>
        public static bool WriteTxt(string str)
        {
            try
            {
                string LogPath = HttpContext.Current.Server.MapPath("/err_log/");
                if (!Directory.Exists(LogPath))
                {
                    Directory.CreateDirectory(LogPath);
                }
                FileStream FileStream = new FileStream(System.Web.HttpContext.Current.Server.MapPath("/err_log//lwf_" + DateTime.Now.ToLongDateString() + "_.txt"), FileMode.Append);
                StreamWriter StreamWriter = new StreamWriter(FileStream);
                //开始写入
                StreamWriter.WriteLine(str);
                //清空缓冲区
                StreamWriter.Flush();
                //关闭流
                StreamWriter.Close();
                FileStream.Close();
            }
            catch (Exception)
            {
                return false;
            }
            return true;
        }
        #endregion

        #region 生成随机字符
        /// <summary>
        /// 生成随机字符
        /// </summary>
        /// <param name="iLength">生成字符串的长度</param>
        /// <returns>返回随机字符串</returns>
        public static string GetRandCode(int iLength)
        {
            string sCode = "";
            if (iLength == 0)
            {
                iLength = 4;
            }
            string codeSerial = "0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
            string[] arr = codeSerial.Split(',');
            int randValue = -1;
            Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
            for (int i = 0; i < iLength; i++)
            {
                randValue = rand.Next(0, arr.Length - 1);
                sCode += arr[randValue];
            }
            return sCode;
        }
        #endregion
    }
}

附件为源码：微信分享Demo