ASP.NET Core2静默获取微信公众号的用户OpenId实例代码

3、在第二步时，我们发现有个VxinUtils类，该类封装了对微信公众号API的操作，具体代码如下：

/// <summary>
/// 微信公众号工具类
/// </summary>
public class VxinUtils
{

	/// <summary>
	/// 微信token
	/// </summary>
	public static string WeiXinToken { get { return ConfigurationManager.AppSettings["WeiXinToken"].ToString(); } }

	/// <summary>
	/// 微信appID
	/// </summary>
	public static string AppID { get { return ConfigurationManager.AppSettings["AppID"].ToString(); } }


	/// <summary>
	/// 微信Aappsecret
	/// </summary>
	public static string Appsecret { get { return ConfigurationManager.AppSettings["Appsecret"].ToString(); } }


	/// <summary>
	/// 获得access_token地址
	/// </summary>
	public static string Access_token_URL { get { return string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", AppID, Appsecret); } }

	/// <summary>
	/// 通过code换取网页授权access_token地址
	/// </summary>
	public static string Web_Access_token_URL { get { return string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&grant_type=authorization_code&code=", AppID, Appsecret); } }


	/// <summary>
	/// 微信菜单创建提交地址
	/// </summary>
	public static string MENU_POST_URL { get { return "https://api.weixin.qq.com/cgi-bin/menu/create?access_token="; } }


	/// <summary>
	/// 微信获取用户分组地址
	/// </summary>
	public static string Group_Get_Url { get { return "https://api.weixin.qq.com/cgi-bin/groups/get?access_token="; } }


	/// <summary>
	/// 微信修改用户分组地址
	/// </summary>
	public static string Group_Update_Url { get { return "https://api.weixin.qq.com/cgi-bin/groups/members/update?access_token="; } }



	/// <summary>
	/// 微信获取用户所属分组地址
	/// </summary>
	public static string Group_GetUserGroup_Url { get { return "https://api.weixin.qq.com/cgi-bin/groups/getid?access_token="; } }

	/// <summary>
	/// 拉取用户信息(需scope为 snsapi_userinfo)
	/// 如果网页授权作用域为snsapi_userinfo，则此时开发者可以通过access_token和openid拉取用户信息了。
	/// https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN
	/// </summary>
	public static string GetUserUserinfo_Url { get { return "https://api.weixin.qq.com/sns/userinfo?lang=zh_CN&access_token="; } }


	/// <summary>
	/// 获取用户的OpenId
	/// </summary>
	/// <param name="code"></param>
	/// <returns></returns>
	public static string GetOpenID(string code)
	{
		var openid = "";
		using (var wl = new WebClient())
		{
			wl.Headers.Add(HttpRequestHeader.Accept, "json");
			wl.Headers.Add(HttpRequestHeader.ContentType, "application/json;charset=UTF-8");
			wl.Headers.Add(HttpRequestHeader.UserAgent, "Mozilla/4.0");
			wl.Encoding = Encoding.UTF8;
			openid = wl.DownloadString(Web_Access_token_URL + code);
		}
		if (!string.IsNullOrEmpty(openid))
		{
			var token = JObject.Parse(openid).SelectToken("openid");
			if (token != null)
				openid = token.ToString();
		}
		return openid;
	}

}								 
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