System.Xml.XmlTextReaderImpl.ReadContentAsBinHex C# (CSharp) Méthode

        public override int ReadContentAsBinHex(byte[] buffer, int index, int count)
        {
            // check arguments
            if (buffer == null)
            {
                throw new ArgumentNullException(nameof(buffer));
            }
            if (count < 0)
            {
                throw new ArgumentOutOfRangeException(nameof(count));
            }
            if (index < 0)
            {
                throw new ArgumentOutOfRangeException(nameof(index));
            }
            if (buffer.Length - index < count)
            {
                throw new ArgumentOutOfRangeException(nameof(count));
            }

            // if not the first call to ReadContentAsBinHex 
            if (_parsingFunction == ParsingFunction.InReadContentAsBinary)
            {
                // and if we have a correct decoder
                if (_incReadDecoder == _binHexDecoder)
                {
                    // read more binary data
                    return ReadContentAsBinary(buffer, index, count);
                }
            }
            // first call of ReadContentAsBinHex -> initialize (move to first text child (for elements) and initialize incremental read state)
            else
            {
                if (_readState != ReadState.Interactive)
                {
                    return 0;
                }
                if (_parsingFunction == ParsingFunction.InReadElementContentAsBinary)
                {
                    throw new InvalidOperationException(SR.Xml_MixingBinaryContentMethods);
                }
                if (!XmlReader.CanReadContentAs(_curNode.type))
                {
                    throw CreateReadContentAsException(nameof(ReadContentAsBinHex));
                }
                if (!InitReadContentAsBinary())
                {
                    return 0;
                }
            }

            // setup binhex decoder (when in first ReadContentAsBinHex call or when mixed with ReadContentAsBase64)
            InitBinHexDecoder();

            // read binary data
            return ReadContentAsBinary(buffer, index, count);
        }

 public override int ReadContentAsBinHex(byte[] buffer, int index, int count)
 {
     return(_impl.ReadContentAsBinHex(buffer, index, count));
 }