WeChat development - obtaining user's basic information through authorization

1. Fill in the domain name of the authorization callback page

Fill in wx.alinq.org here. After obtaining the user's authorization, it will jump to a page specified by the developer, and the link to the page must be under the domain name. If not filled in, a page with invalid page links will appear.

2. Guide the user to the specified authorization page

For example: https://open.weixin.qq .com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect

For the explanation of parameters, please refer to WeChat related documents. It is worth noting that redirect_uri is a url, which must be url encoded. After generating the url, you can go to http://cli.im/text/2014052714?4QbdC to generate a QR code for the url, and then Scan it in WeChat to test it.

After scanning:

3. Finally, here is the complete implementation code

Below is the complete code, I hope it is useful to everyone. ^_^

<%@ WebHandler Language="C#" %>

public class UserAuth : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
 
        var appid = "wxf1c24c60e3ac13b7";
        var secret = "5902b9817acb7a290d4b7c2e6e97d4d3";

        var code = context.Request.QueryString["Code"];
        if (string.IsNullOrEmpty(code))
        {
            var url = string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri=http%3a%2f%2fwx.alinq.org%2fTest%2fUserAuth.ashx&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect", appid);
            context.Response.Redirect(url);
        }
        else
        {
            var client = new System.Net.WebClient();
            client.Encoding = System.Text.Encoding.UTF8;

            var url = string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code", appid, secret, code);
            var data = client.DownloadString(url);

            var serializer = new JavaScriptSerializer();
            var obj = serializer.Deserialize<Dictionary<string, string>>(data);
            string accessToken;
            if (!obj.TryGetValue("access_token", out accessToken))
                return;

            var opentid = obj["openid"];
            url = string.Format("https://api.weixin.qq.com/sns/userinfo?access_token={0}&openid={1}&lang=zh_CN", accessToken, opentid);
            data = client.DownloadString(url);
            var userInfo = serializer.Deserialize<Dictionary<string, object>>(data);
            foreach (var key in userInfo.Keys)
            {
                context.Response.Write(string.Format("{0}: {1}", key, userInfo[key]) + "<br/>");
            }
        }
    }
}

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