System.IO.FileStream.SetLengthInternal C# (CSharp) Method

        private void SetLengthInternal(long value)
        {
            // Handle buffering updates.
            if (_writePos > 0)
            {
                FlushWriteBuffer();
            }
            else if (_readPos < _readLength)
            {
                FlushReadBuffer();
            }
            _readPos = 0;
            _readLength = 0;

            if (_appendStart != -1 && value < _appendStart)
                throw new IOException(SR.IO_SetLengthAppendTruncate);
            SetLengthCore(value);
        }