public class Starter
    {
        private static void Main(string[] args)
        {

            var client = new RestClient("https://*****");

            var resp =  client.GetAccessToken("DD", "20250201");
            Console.WriteLine(resp);

            Console.ReadKey();
        }
       
    }

    public class SignParam
    {
        public string nonce { get; set; }

        public long timestamp { get; set; }

        public string sign { get; set; }

        public string keywords { get; set; }
    }

    public static class ResetClientExtension
    {
        public static string GetAccessToken(this IRestClient client,string FromType, string keywords)
        {
            var url = "****";
            if (FromType=="DD")
            {
                url = "/open/v1/kis/business";
            }
            //獲取隨機(jī)32個字符串
            var nonce = Guid.NewGuid().ToString().Replace("-", "");
            //獲取當(dāng)前的時間戳
            var timestamp = Convert.ToInt64((DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalMilliseconds);

            var request = new RestRequest(url, Method.Post);
            request.AddHeader("Content-Type", "application/json");

            var sb = new StringBuilder();
            if (FromType=="KH")
            {
                if (!string.IsNullOrWhiteSpace(keywords))
                    sb.Append($"keywords={keywords}&nonce={nonce}");
                else
                    sb.Append($"nonce={nonce}");
            }
            else if (FromType == "DD")
            {
                    sb.Append($"nonce={nonce}&queryDay={keywords}");
            }
           

            sb.Append($"&timestamp={timestamp}");
            sb.Append("&signKey=E5VehnFxVkUTgTyTBuUB08orlvmduq1F");
            //根據(jù)屬性名稱ASCII碼排序，空值不參與簽名;并且md5加密
            var sign = string.Join("", MD5.Create().ComputeHash(Encoding.UTF8.GetBytes(sb.ToString())).Select(x => x.ToString("x2")));

            var body = JsonConvert.SerializeObject(new SignParam
            {
                nonce = nonce,
                timestamp = timestamp,
                sign = sign,
                keywords = keywords
            });

            request.AddParameter("application/json", body, ParameterType.RequestBody);
            var resp = client.Execute(request);

            return resp.Content;
        }



    }