public class WeiXinOAuth{    /// <summary>    /// 获取微信Code    /// </summary>    /// <param name="appId"></param>    /// <param name="appSecret"></param>    /// <param name="redirectUrl"></param>    public string GetWeiXinCode(string appId,string appSecret,string redirectUrl)    {        Random r = new Random();        //微信登录授权        //string url = "https://open.weixin.qq.com/connect/qrconnect?appid=" + appId + "&redirect_uri=" + redirectUrl +"&response_type=code&scope=snsapi_login&state=STATE#wechat_redirect";        //微信OpenId授权        //string url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + appId + "&redirect_uri=" + redirectUrl +"&response_type=code&scope=snsapi_login&state=STATE#wechat_redirect";        //微信用户信息授权        string url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + appId + "&redirect_uri=" + redirectUrl + "&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect";        return url;    }    /// <summary>    /// 通过code获取access_token    /// </summary>    /// <param name="appId"></param>    /// <param name="appSecret"></param>    /// <param name="code"></param>    /// <returns></returns>    public Model.WeiXinAccessTokenResult GetWeiXinAccessToken(string appId,string appSecret,string code)    {        string url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid="+appId+"&secret="+appSecret+            "&code="+ code + "&grant_type=authorization_code";        string jsonStr = Tools.GetHttpRequest(url);        Model.WeiXinAccessTokenResult result = new Model.WeiXinAccessTokenResult();        if (jsonStr.Contains("errcode"))        {            Model.WeiXinErrorMsg errorResult = new Model.WeiXinErrorMsg();            errorResult=JsonHelper.ParseFromJson<Model.WeiXinErrorMsg>(jsonStr);            result.ErrorResult = errorResult;            result.Result = false;        }        else        {            Model.WeiXinAccessTokenModel model = new Model.WeiXinAccessTokenModel();            model = JsonHelper.ParseFromJson<Model.WeiXinAccessTokenModel>(jsonStr);            result.SuccessResult = model;            result.Result = true;        }        return result;    }    /// <summary>    /// 拉取用户信息    /// </summary>    /// <param name="accessToken"></param>    /// <param name="openId"></param>    /// <returns></returns>    public Model.WeiXinUserInfoResult GetWeiXinUserInfo(string accessToken,string openId)    {        string url = "https://api.weixin.qq.com/sns/userinfo?access_token="+accessToken+"&openid="+openId+"&lang=zh_CN";        string jsonStr = Tools.GetHttpRequest(url);        Model.WeiXinUserInfoResult result = new Model.WeiXinUserInfoResult();        if(jsonStr.Contains("errcode"))        {            Model.WeiXinErrorMsg errorResult = new Model.WeiXinErrorMsg();            errorResult = JsonHelper.ParseFromJson<Model.WeiXinErrorMsg>(jsonStr);            result.ErrorMsg = errorResult;            result.Result = false;        }        else        {            Model.WeiXinUserInfo userInfo = new Model.WeiXinUserInfo();            userInfo = JsonHelper.ParseFromJson<Model.WeiXinUserInfo>(jsonStr);            result.UserInfo = userInfo;            result.Result = true;        }        return result;    }}

所需要的对应实体类

WeiXinAccessTokenResult 类:

public partial class BasePage : System.Web.UI.Page{    public BasePage()    {        this.Page.Load += new EventHandler(Page_Load);        this.Page.Unload += new EventHandler(Page_UnLoad);    }    protected void Page_Load(object sender, EventArgs e)    {        DoWith();    }    protected void Page_UnLoad(object sender, EventArgs e)    {    }    private void DoWith()    {        //用户尚未登录        if (BLL.UserInfoManager.Instance().GetUserId() <= 0)        {            //获取appId,appSecret的配置信息            string appId = System.Configuration.ConfigurationSettings.AppSettings["appid"];            string appSecret = System.Configuration.ConfigurationSettings.AppSettings["secret"];            Core.WeiXinOAuth weixinOAuth = new WeiXinOAuth();            //微信第一次握手后得到的code 和state            string _code = Cmn.Request.Get("code");            string _state = Cmn.Request.Get("state");            if (_code == "" || _code == "authdeny")            {                if (_code == "")                {                    //发起授权(第一次微信握手)                    string _authUrl = weixinOAuth.GetWeiXinCode(appId, appSecret, HttpContext.Current.Server.UrlEncode(HttpContext.Current.Request.Url.ToString()));                    HttpContext.Current.Response.Redirect(_authUrl, true);                }                else                { // 用户取消授权                    HttpContext.Current.Response.Redirect("~/Error.html", true);                }            }            else            {                //获取微信的Access_Token（第二次微信握手）                Core.Model.WeiXinAccessTokenResult modelResult = weixinOAuth.GetWeiXinAccessToken(appId, appSecret, _code);                //获取微信的用户信息(第三次微信握手)                Core.Model.WeiXinUserInfoResult _userInfo = weixinOAuth.GetWeiXinUserInfo(modelResult.SuccessResult.access_token,modelResult.SuccessResult.openid);                //用户信息（判断是否已经获取到用户的微信用户信息）                if (_userInfo.Result && _userInfo.UserInfo.openid != "")                {                    //保存获取到的用户微信用户信息，并保存到数据库中                }                else                {                    GameTradingByPublic.ExceptionLog.writeFile(2, "获取用户OpenId失败");                }            }        }    }}