iTextSharp.text.pdf.PdfString.ToUnicodeString C# (CSharp) Метод

        public String ToUnicodeString()
        {
            if (encoding != null && encoding.Length != 0)
                return value;
            GetBytes();
            if (bytes.Length >= 2 && bytes[0] == (byte)254 && bytes[1] == (byte)255)
                return PdfEncodings.ConvertToString(bytes, PdfObject.TEXT_UNICODE);
            else
                return PdfEncodings.ConvertToString(bytes, PdfObject.TEXT_PDFDOCENCODING);
        }

        /** Gets the field value or <CODE>null</CODE> if the field does not
         * exist or has no value defined.
         * @param name the fully qualified field name
         * @return the field value or <CODE>null</CODE>
         */
        public String GetFieldValue(String name)
        {
            PdfDictionary field = GetField(name);

            if (field == null)
            {
                return(null);
            }
            PdfObject v = GetPdfObject(field.Get(PdfName.V));

            if (v == null)
            {
                return(null);
            }
            if (v.IsName())
            {
                return(PdfName.DecodeName(((PdfName)v).ToString()));
            }
            else if (v.IsString())
            {
                PdfString vs = (PdfString)v;
                if (encoding == null || vs.Encoding != null)
                {
                    return(vs.ToUnicodeString());
                }
                byte[] b = vs.GetBytes();
                if (b.Length >= 2 && b[0] == (byte)254 && b[1] == (byte)255)
                {
                    return(vs.ToUnicodeString());
                }
                try {
                    if (encoding.Equals(PdfName.SHIFT_JIS))
                    {
                        return(Encoding.GetEncoding(932).GetString(b));
                    }
                    else if (encoding.Equals(PdfName.UHC))
                    {
                        return(Encoding.GetEncoding(949).GetString(b));
                    }
                    else if (encoding.Equals(PdfName.GBK))
                    {
                        return(Encoding.GetEncoding(936).GetString(b));
                    }
                    else if (encoding.Equals(PdfName.BIGFIVE))
                    {
                        return(Encoding.GetEncoding(950).GetString(b));
                    }
                    else if (encoding.Equals(PdfName.UTF_8))
                    {
                        return(Encoding.UTF8.GetString(b));
                    }
                }
                catch  {
                }
                return(vs.ToUnicodeString());
            }
            return(null);
        }