BiliRanking.Core.BiliApiHelper.GetSign C# (CSharp) Method

        public static string GetSign(string url)
        {
            string result;
            string str = url.Substring(url.IndexOf("?", 4) + 1);
            List<string> list = str.Split('&').ToList();
            list.Sort();
            StringBuilder stringBuilder = new StringBuilder();
            foreach (string str1 in list)
            {
                stringBuilder.Append((stringBuilder.Length > 0 ? "&" : string.Empty));
                stringBuilder.Append(str1);
            }
            stringBuilder.Append(_appSecret_Wp);
            using (var md5 = MD5.Create())
            {
                result = BitConverter.ToString(md5.ComputeHash(Encoding.ASCII.GetBytes(stringBuilder.ToString()))).Replace("-", "").ToLower();
            }
            return result;
        }

        public async Task <UserInfoModel> GetMyUserInfo()
        {
            if (IsLogin())
            {
                try
                {
                    string url = string.Format("http://account.bilibili.com/api/myinfo?access_key={0}&appkey={1}&platform=wp&type=json", BiliApiHelper.access_key, BiliApiHelper._appKey_IOS);
                    url += "&sign=" + BiliApiHelper.GetSign(url);
                    string results = await BiliInterface.GetHtmlAsync(url);

                    UserInfoModel model = JsonConvert.DeserializeObject <UserInfoModel>(results);
                    //AttentionList = model.attentions;
                    return(model);
                }
                catch (Exception)
                {
                    return(null);
                }
            }
            else
            {
                return(null);
            }
        }