private static int timeOut = 10000;//设置连接超时时间，默认10秒，用户可以根据具体需求适当更改timeOut的值
public static void GetParams(SortedDictionary <string, object> requestParams, string secretId, string secretKey,
string requestMethod, string requestHost, string requestPath)
{
requestParams.Add("SecretId", secretId);
Random rand = new Random();
requestParams.Add("Nonce", rand.Next(Int32.MaxValue).ToString());
DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1, 0, 0, 0, 0));
DateTime nowTime = DateTime.Now;
long unixTime = (long)Math.Round((nowTime - startTime).TotalMilliseconds, MidpointRounding.AwayFromZero);
requestParams.Add("Timestamp", (unixTime / 1000).ToString());
requestParams.Add("RequestClient", VERSION);
string plainText = Sign.MakeSignPlainText(requestParams, requestMethod, requestHost, requestPath);
string SignatureMethod = "HmacSHA1";
if (requestParams.ContainsKey("SignatureMethod") && requestParams["SignatureMethod"] == "HmacSHA256")
{
SignatureMethod = "HmacSHA256";
}
string sign = Sign.Signature(plainText, secretKey, SignatureMethod);
requestParams.Add("Signature", sign);
}