微信订阅号，获取用户openid

在微信后台，启用服务器配置。

服务器URL地址，要通过Token的验证。

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private void Auth()   {       string token = ConfigurationManager.AppSettings["WeixinToken"];//从配置文件获取Token       if (string.IsNullOrEmpty(token))       {                         LogTextHelper.Error(string.Format("WeixinToken 配置项没有配置！"));       }         string echoString = HttpContext.Current.Request.QueryString["echoStr"];       string signature = HttpContext.Current.Request.QueryString["signature"];       string timestamp = HttpContext.Current.Request.QueryString["timestamp"];       string nonce = HttpContext.Current.Request.QueryString["nonce"];         if (CheckSignature(token, signature, timestamp, nonce))       {           if (!string.IsNullOrEmpty(echoString))           {               HttpContext.Current.Response.Write(echoString);               HttpContext.Current.Response.End();           }       }   }

　　关注订阅号，发一个文本消息。里面有用户的openid

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/// <summary>      /// 主入口      /// </summary>      /// <param name="msg"></param>      private void OnRecvEvent(ReqMsgEventBase msg)      {          switch (msg.Event)          {              case Event.LOCATION:                  break;              case Event.subscribe:                   string content = “openid=”+msg.FromUserName;                  SendResponseText(msg, content);                  break;              case Event.unsubscribe:                  break;              default:                  break;          }        }