private String GetSign(Dictionary <String, String> data)
{
var sum = new StringBuilder();
var sort = from key in data.Keys orderby key select key;
foreach (var key in sort)
{
sum.Append(data[key]);
}
sum.Append(this.SecurityKey);
var sign = HashUtils.CalculateMD5Hash(sum.ToString()).ToLower();
return(sign);
}
