C#按规则获取byte[](如截取几个字节 与 几个字节 之前间字节)

视频教程地址 https://www.bilibili.com/video/BV1UL411b7L5/

public byte[] GetBytePart(byte[] data, byte[] startData, byte[] endData, bool contain = false)
{
    int start = IndexOf(data, startData);
    int end = IndexOf(data, endData);
    if (start != -1 && end != -1)
    {
       
        int count = 0;
        if (contain)
        {
            count = end + endData.Length - start;
        }
        else
        {
            start = start + startData.Length;
            count = end - start;
        }
       
        return data.Skip(start).Take(count).ToArray();
    }
    else
    {
        return null;
    }
}
public int IndexOf(byte[] data, byte[] find)
{
    for (int i = 0; i < data.Length - find.Length; i++)
    {
        if (data.Skip(i).Take(find.Length).SequenceEqual(find))
        {
            return i;
        }
    }
    return -1;
}
//原创来自http://www.luofenming.com/show.aspx?id=ART2018100900001，如转载请保留此地址

以下是调用

//这是截取 byte[] { 0x11, 0x21, 0x31, 0xff, 0x10, 0x01, 0x12, 0x13, 0x0a, 0x20, 0x11 ,0x02}    
//byte[] { 0x31, 0xff, 0x10 },  byte[] { 0x0a, 0x20 }这两个字节数组之间的字节并且包含这两个字节数据



byte[] bytes = new byte[] { 0x11, 0x21, 0x31, 0xff, 0x10, 0x01, 0x12, 0x13, 0x0a, 0x20, 0x11 ,0x02};
byte[] b = GetBytePart(bytes, new byte[] { 0x31, 0xff, 0x10 }, new byte[] { 0x0a, 0x20 });
//得到的结果是  0x01, 0x12, 0x13