/// 
/// Base64编码/// 
/// /// 
     public string base64Encode(string data){    try    {        byte[] encData_byte = new byte[data.Length];        encData_byte = System.Text.Encoding.UTF8.GetBytes(data);        string encodedData = Convert.ToBase64String(encData_byte);        return encodedData;    }    catch (Exception e)    {        throw new Exception("Error in base64Encode" + e.Message);    }}

/// 
/// Base64解码/// 
/// /// 
     public string base64Decode(string data){    try    {        System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();        System.Text.Decoder utf8Decode = encoder.GetDecoder();        byte[] todecode_byte = Convert.FromBase64String(data);        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 result = new String(decoded_char);        return result;    }    catch (Exception e)    {        throw new Exception("Error in base64Decode" + e.Message);    }}