参考微信JS-SDK说明文档，
1、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、在需要调用JS接口的页面引入如下JS文件，（支持https）：http://res.wx.qq.com/open/js/jweixin-1.0.0.js
要分享的页面代码：
using System.Runtime.Serialization.Json;//需添加System.Runtime.Serialization引用
public partial class WeiXinShareScript : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
RegisterWeiXinShareScript();
}
}
private void RegisterWeiXinShareScript()
{
//公众号的应用ID
string appid = "";
//公众号的应用密钥
string secret = "";
//生成签名的时间戳
TimeSpan ts = DateTime.Now - DateTime.Parse("1970-01-01 00:00:00");
string timestamp = ts.TotalSeconds.ToString().Split('.')[0];
//生成签名的随机串
string nonceStr = "test";
//微信access_token，用于获取微信jsapi_ticket
string token = GetAccess_token(appid, secret);
//微信jsapi_ticket
string ticket = GetTicket(token);
//当前网页的URL
string pageurl = Request.Url.AbsoluteUri;
//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 + "×tamp=" + timestamp + "&url=" + pageurl;
//签名,使用SHA1生成
string signature = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "SHA1").ToLower();
//要注册到页面的JS脚本
StringBuilder sbjsApi = new StringBuilder();
sbjsApi.Append("<script>");
//通过config接口注入权限验证配置
sbjsApi.Append("wx.config({debug:false,");
sbjsApi.Append("appId: '" + appid + "',");
sbjsApi.Append("timestamp: " + timestamp + ",");
sbjsApi.Append("nonceStr: '" + nonceStr + "',");
sbjsApi.Append("signature: '" + signature + "',");
sbjsApi.Append("jsApiList: ['onMenuShareTimeline', 'onMenuShareAppMessage', 'chooseImage', 'uploadImage', 'getNetworkType']});");
//通过ready接口处理成功验证
sbjsApi.Append("wx.ready(on_weixin_ready);");
sbjsApi.Append("function on_weixin_ready() {weixin_share();}");
//获取“分享给朋友”按钮点击状态及自定义分享内容接口
sbjsApi.Append("function weixin_share(){");
sbjsApi.Append("wx.onMenuShareAppMessage({");
sbjsApi.Append("title:'分享出去的标题',");
sbjsApi.Append("desc:'分享出去的内容',");
sbjsApi.Append("link:'分享出去的链接地址',");
sbjsApi.Append("imgUrl:'分享出去的图标地址',");
sbjsApi.Append("type:'link',");
sbjsApi.Append("dataUrl:'',");
sbjsApi.Append("success: function () { alert('分享成功');},");
sbjsApi.Append("cancel:function () {}");
sbjsApi.Append("});");
//获取“分享到朋友圈”按钮点击状态及自定义分享内容接口
sbjsApi.Append("wx.onMenuShareTimeline({");
sbjsApi.Append("title:'分享出去的标题',");
sbjsApi.Append("link:'分享出去的链接地址',");
sbjsApi.Append("imgUrl:'分享出去的图标地址',");
sbjsApi.Append("success: function () { alert('分享成功');},");
sbjsApi.Append("cancel:function () {}");
sbjsApi.Append("});}");
sbjsApi.Append("</script>");
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "weixin", sbjsApi.ToString().Trim());
}
/// <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; }
}