将ReadOnlySequence拆分成行，然后使用分隔符进行ReadOnlySequence

using System;
using System.Buffers;

public class Program
{
    public static void Main()
    {
        // 假设有一个包含多行文本的ReadOnlySequence
        ReadOnlySequence<byte> sequence = CreateReadOnlySequence();

        // 定义行分隔符
        byte[] delimiter = { (byte)'\n' };

        // 拆分ReadOnlySequence成行
        foreach (var line in SplitSequenceIntoLines(sequence, delimiter))
        {
            // 对每行进行操作，这里只是简单打印
            Console.WriteLine(Encoding.UTF8.GetString(line.ToArray()));
        }
    }

    private static ReadOnlySequence<byte> CreateReadOnlySequence()
    {
        // 创建一个包含多行文本的ReadOnlySequence
        byte[] data = Encoding.UTF8.GetBytes("Line 1\nLine 2\r\nLine 3\nLine 4");
        return new ReadOnlySequence<byte>(data);
    }

    private static IEnumerable<ReadOnlyMemory<byte>> SplitSequenceIntoLines(ReadOnlySequence<byte> sequence, byte[] delimiter)
    {
        var reader = new SequenceReader<byte>(sequence);

        while (!reader.End)
        {
            if (reader.TryReadTo(out ReadOnlyMemory<byte> line, delimiter))
            {
                yield return line;
            }
            else
            {
                // 处理跨越多个内存块的行
                var remaining = reader.UnreadSequence;
                if (remaining.Length > 0)
                {
                    reader.Advance(remaining.Start, remaining.End);
                }
                else
                {
                    break;
                }
            }
        }
    }
}