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微信获取OpenId的方法

齐英韶
2023-12-01

[System.Web.Http.HttpGet]
public JsonResult GetOpenId(string Code)//传入Code值
{

       string  AppId = ConfigurationManager.AppSettings["AppId"]; //获取数据为string类型且在appsettings[“相关key”]
        string AppSc = ConfigurationManager.AppSettings["AppSc"]; //获取数据为string类型且在appsettings[“相关key”]


        string code = Code;
        string html = string.Empty;
        string url = $"https://api.weixin.qq.com/sns/jscode2session?appid={AppId}&secret={AppSc}&js_code={code}&grant_type=authorization_code";
        HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
        request.Method = "GET";
        HttpWebResponse response = request.GetResponse() as HttpWebResponse;
        Stream ioStream = response.GetResponseStream();
        StreamReader sr = new StreamReader(ioStream, Encoding.UTF8);
        html = sr.ReadToEnd();
        sr.Close();
        ioStream.Close();
        response.Close();

        string key = "\"openid\":\"";
        string OpenId = "";
        CodeMsg msg = new CodeMsg();
        msg.Reson = html;
        int startIndex = html.IndexOf(key);
        if (startIndex != -1 )
        {
            //int endIndex = html.IndexOf ("\",", startIndex);

            //OpenId = html.Substring(startIndex + key.Length, endIndex - startIndex - key.Length); 
            string jsonString = html;
            JObject json = JObject.Parse(jsonString);//推荐使用Jboject来使用。
            OpenId = json["openid"].ToString();

        }
        if (!string.IsNullOrEmpty(OpenId))
        {
            AccontMain model = new AccontMain();
            model = GetModel(OpenId);
            if (model != null)
            {
                msg.Code = 1;
                msg.Count = 1;
                msg.Data = model;
            }
            else
            {
                model = new AccontMain();
                msg.Code = 1;
                msg.Count = 0;
                model.WxId = OpenId;
                msg.Data = model;
            }

        }
        return Json<CodeMsg>(msg);
    }
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