Introduction to how to obtain AccessToken when developing WeChat using .net

The example in this article shares the method of obtaining AccessToken for your reference. The specific content is as follows

AccessToken obtaining method

public static Access_token GetAccessToken()
{
  string formatString = String.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", AppId, AppSecret);
 
  Access_token res = new Access_token();
  HttpWebRequest request = (HttpWebRequest)WebRequest.Create(formatString);
  request.Method = "GET";
  request.ContentType = "text/html;charset=UTF-8";
  HttpWebResponse response = (HttpWebResponse)request.GetResponse();
  Stream myResponseStream = response.GetResponseStream();
  StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
  string retString = myStreamReader.ReadToEnd();
  myStreamReader.Close();
  myResponseStream.Close();
  if (retString.IndexOf("7200") > 0)
  {
    Access_token token = new Access_token();
    token = JsonHelper.ParseFromJson<Access_token>(retString);
    res.access_token = token.access_token;
    res.expires_in = token.expires_in;
  }
  return res;
}

Access_token class structure

public class Access_token
{
  public Access_token()
  {
    // 
    //TODO:用于验证Access_token是否过期实体
    // 
  }
  string _access_token;
  string _expires_in;
 
  /// <summary> 
  /// 获取到的凭证  
  /// </summary> 
  public string access_token
  {
    get { return _access_token; }
    set { _access_token = value; }
  }
 
  /// <summary> 
  /// 凭证有效时间，单位：秒 
  /// </summary> 
  public string expires_in
  {
    get { return _expires_in; }
    set { _expires_in = value; }
  }
}

JsonHelper.ParseFromJson Method

/// <summary> 
/// 将JSON对象转换为Model
/// </summary> 
/// <typeparam name="T"></typeparam> 
/// <param name="szJson"></param> 
/// <returns></returns> 
public static T ParseFromJson<T>(string szJson)
{
  T obj = Activator.CreateInstance<T>();
  using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(szJson)))
  {
    DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());
    return (T)serializer.ReadObject(ms);
  }
}

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