System.IO.BinaryReader.BinaryReader C# (CSharp) Méthode

        public BinaryReader(Stream input, Encoding encoding, bool leaveOpen)
        {
            if (input == null)
            {
                throw new ArgumentNullException(nameof(input));
            }
            if (encoding == null)
            {
                throw new ArgumentNullException(nameof(encoding));
            }
            if (!input.CanRead)
            {
                throw new ArgumentException(SR.Argument_StreamNotReadable);
            }

            _stream = input;
            _decoder = encoding.GetDecoder();
            _maxCharsSize = encoding.GetMaxCharCount(MaxCharBytesSize);
            int minBufferSize = encoding.GetMaxByteCount(1);  // max bytes per one char
            if (minBufferSize < 16)
            {
                minBufferSize = 16;
            }

            _buffer = new byte[minBufferSize];
            // _charBuffer and _charBytes will be left null.

            // For Encodings that always use 2 bytes per char (or more), 
            // special case them here to make Read() & Peek() faster.
            _2BytesPerChar = encoding is UnicodeEncoding;
            // check if BinaryReader is based on MemoryStream, and keep this for it's life
            // we cannot use "as" operator, since derived classes are not allowed
            _isMemoryStream = (_stream.GetType() == typeof(MemoryStream));
            _leaveOpen = leaveOpen;

            Debug.Assert(_decoder != null, "[BinaryReader.ctor]_decoder!=null");
        }