C# WeChat public account development--Web page authorization (oauth2.0) to obtain basic user information 1

Preface

WeChat web page authorization is divided into two methods: snsapi_base and snsapi_userinfo. snsapi_base needs to follow the public account, and the user authorization interface will not pop up when obtaining user information. snsapi_userinfo is used when the user browses the page without following the official account. A user authorization interface will pop up first, and the user information can only be obtained after the user authorizes it. In this article, we first look at the snsapi_base implementation.

Note when stepping on pitfalls

• When I first started debugging in snsapi_base mode, when I clicked on the page address, it prompted that the address link was unavailable. The web page authorization needs to be done first. Set the basic information for web page authorization in the official account, that is, set the domain name.

• Clearly distinguish between global access_token and web page authorization access_token

## Note here that you only fill in the domain name

See the effect

Here we see that we have obtained the user’s basic information through oauth snsapi_base, which is enough for general consulting development .

Look at the ideas

1. Get the code first by returning the address.

2. Get openid through code.

3. Get the global access_token through appid and appsecret (this is different from snsapi_userinfo).

4. Get user information through global access_token and openid.

Look at the code

It’s simple here. The main thing is to adjust the WeChat interface through the get method. At the same time, prepare your get and post request methods, and use json for the return parameters. Convert to entity class.

public ActionResult OAuthSnsApiBase() {      
string code = Request.QueryString["code"];      
try     
{           
if (!string.IsNullOrEmpty(code))           
{                   
OAuthToken oauthToken = HttpUtility.Get<OAuthToken>
(string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code", appID, appsecret, code));
                    
string accesstoken = string.Empty;                    
AccessToken token = HttpUtility.Get<AccessToken>(string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}",
appID,appsecret));                    
if (token != null && !string.IsNullOrEmpty(token.access_token))                    
{                        
accesstoken = token.access_token;                    
}                                        
if (oauthToken != null && !string.IsNullOrEmpty(oauthToken.openid))                    
{                                                
OAuthUserInfo userInfo = HttpUtility.Get<OAuthUserInfo>(string.Format("https://api.weixin.qq.com/cgi-bin/user/info?access_token={0}&openid={1}&lang=zh_CN", 
accesstoken, oauthToken.openid));                        
if (userInfo != null)                        
{                                                                     
ViewData["headImage"] = userInfo.headimgurl;                            
ViewData["openid"] = userInfo.openid;                            
ViewData["nickName"] = userInfo.nickname;                            
if (userInfo.sex == 0)                            
{                                
ViewData["sex"] = "未知";                            
}                            
else if (userInfo.sex == 1)                            
{                                
ViewData["sex"] = "男";                            
}                            
else                            
{                                
ViewData["sex"] = "女";                            
}                            
ViewData["province"] = userInfo.province;                            
ViewData["city"] = userInfo.city;                        
}                        
else                        
{                                                
}                    
}                    
else                    
{                                           
}                                  
}                
else                
{                    
return Redirect(string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type=code&scope=snsapi_base&state=123456
#wechat_redirect", appID,"http://"+Request.Url.Host + Url.Action("OAuthSnsApiBase")));                
}            
}            
catch (Exception ex)            
{                         
ViewData["errmsg"] = ex.Message;            
}                        
return View();        
}

 public class OAuthToken    
 {        
 public string access_token { get; set; }        
 public int expires_in { get; set; }        
 public string refresh_token { get; set; }        
 public string openid { get; set; }        
 public string scope { get; set; }    
 } 
 public class AccessToken    
 {        
 public string access_token { get; set; }        
 public int expires_in { get; set; }    
 }public class OAuthUserInfo    
 {        
 public string openid { get; set; }        
 public string nickname { get; set; }        
 public int sex { get; set; }       
  public string province { get; set; }        
  public string city { get; set; }        
  public string country { get; set; }        
  public string headimgurl { get; set; }        
  public string privilege { get; set; }        
  public string unionid { get; set; }            
  }

Summary

The interface to obtain user information here is

https://api.weixin.qq.com/cgi-bin/user/info?access_token=ACCESS_TOKEN&openid=OPENID&lang= zh_CN. It is different from the web page authorization 2 to obtain the user interface.

## All codes are uploaded to github: https://github.com /garfieldzf8/WeChat

Reference

http://www.cnblogs.com/txw1958/p/weixin76-user-info.html

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