Dictionary<string, string> sPara = GetRequestPost(ref parameterStr);                string serializeString = JSONUtility.Serialize(sPara);                serializeString = Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(serializeString));

System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();                        System.Text.Decoder utf8Decode = encoder.GetDecoder();                        byte[] todecode_byte = Convert.FromBase64String(base64DataString);                        int charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);                        char[] decoded_char = new char[charCount];                        utf8Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);                        string decodeResult = new String(decoded_char);                        Dictionary<string, string> sPara = JSONUtility.Deserialize<Dictionary<string, string>>(decodeResult);