MVC 微信开发获取用户OpenID

第一次开发微信版网页，对最重要的获取微信OpenId，特此记录下来

1.首先得有appid和appsecret
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1 1. public class WeiXin {
2
3 public static string appid {
4 get {
5 string _appid = “wx3xxxxxxxxxxxxxxx”;
6 return _appid;
7 }
8 }
9 public static string aseret {
10 get {
11 string appsecret = “b6719276d539796d94bxxxxxxxxxxxxxxx”;
12 return appsecret;
13 }
14 }
15
16 }

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2.只获取用户的openID，，在确保微信公众账号拥有授权作用域（scope参数）的权限的前提下（服务号获得高级接口后，默认拥有scope参数中的snsapi_base和snsapi_userinfo），引导关注者打开如下页面，以snsapi_base为scope发起的网页授权，并且是静默授权并自动跳转到回调页的。用户感知的就是直接进入了回调页(下面代码中的url参数就是回调页，静态的可以写成：string url = https://wx.baidu.com/controller/GetOpenId，注意URL需要进行HttpUtility.UrlEncode（url）编码,还有回调页的域名需要和微信公众号里面设置的回调域名相同)
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1 public class ApplyVIPController : Controller
2 {
3
4 // GET: /ApplyVIP/
5
6 public ActionResult Index(string url)
7 {
8 string _url = string.Format(“https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type=code&scope=snsapi_base&state={2}#wechat_redirect”,
9 WeiXin.appid,
10 url,//回调页URL
11 Guid.NewGuid().ToString(“N”));
12 return Redirect(_url);//这里微信会自动取出回调页URL，并且跳转到该url所属的页面
13 }

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3.获取code，并且通过code获取Openid，正确时返回的JSON数据包如下：{ “access_token”:”ACCESS_TOKEN”, “expires_in”:7200, “refresh_token”:”REFRESH_TOKEN”, “openid”:”OPENID”, “scope”:”SCOPE” }，这里面就包含了所需要的OPENID
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   //controller

public string GetOpenId() {
string code = requset.querystring[“code”];
string openid = “”;
string json = “”;
string url = string.Format(“https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code “//通过appid,appaseret,code
, WeiXin.appid, WeiXin.aseret, code);
HttpQuery.Get(url, null, msg => {
json = msg;
});
JObject job = (JObject)JsonConvert.DeserializeObject(json);
openid = job[“openid”].ToString();
return openid;
}

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4.请求获取Openid的httpquery.get()方法
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public class HttpQuery {    private static readonly string DefaultUserAgent =        "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";    public static void Get(string url, object data, Action<string> callback) {        IDictionary<string, string> parameters = Getparameters(data);        if (!(parameters == null || parameters.Count == 0)) {            url += "?";            foreach (var item in parameters) {                url += item.Key + "=" + item.Value + "&";            }        }        CreateGetHttpResponse(url, null, null, null, callback);    }    /// <summary>      /// 创建GET方式的HTTP请求      /// </summary>      /// <param name="url">请求的URL</param>      /// <param name="timeout">请求的超时时间</param>      /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>      /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>      /// <returns></returns>      private static HttpWebResponse CreateGetHttpResponse(string url, int? timeout, string userAgent,        CookieCollection cookies, Action<string> callback, string encoding = "utf-8") {        if (string.IsNullOrEmpty(url)) {            return null;            //throw new ArgumentNullException("url");        }        try {            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;            request.Method = "GET";            request.UserAgent = DefaultUserAgent;            if (!string.IsNullOrEmpty(userAgent)) {                request.UserAgent = userAgent;            }            if (timeout.HasValue) {                request.Timeout = timeout.Value;            }            if (cookies != null) {                request.CookieContainer = new CookieContainer();                request.CookieContainer.Add(cookies);            }            HttpWebResponse httpWebResponse = request.GetResponse() as HttpWebResponse;            StreamReader reader = new StreamReader(httpWebResponse.GetResponseStream(),                System.Text.Encoding.GetEncoding(encoding));            string html = "";            //获取请求到的数据            html = reader.ReadToEnd();            //关闭            httpWebResponse.Close();            reader.Close();                callback(html);                return httpWebResponse;            }        } catch {            callback(null);        }        return null;    }

}