System.Net.Http.WinHttpResponseStream.ReadAsync C# (CSharp) Method

        public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken token)
        {
            if (buffer == null)
            {
                throw new ArgumentNullException(nameof(buffer));
            }

            if (offset < 0)
            {
                throw new ArgumentOutOfRangeException(nameof(offset));
            }

            if (count < 0)
            {
                throw new ArgumentOutOfRangeException(nameof(count));
            }

            if (count > buffer.Length - offset)
            {
                throw new ArgumentException(SR.net_http_buffer_insufficient_length, nameof(buffer));
            }

            if (token.IsCancellationRequested)
            {
                return Task.FromCanceled<int>(token);
            }

            CheckDisposed();

            if (_state.AsyncReadInProgress)
            {
                throw new InvalidOperationException(SR.net_http_no_concurrent_io_allowed);
            }

            return ReadAsyncCore(buffer, offset, count, token);
        }