如何更快地上这节课

Question

如何优化此类？

使其更快。这个研究人员类在文件上搜索字节偏移量，然后在用字节替换此偏移量之后。 目前，它需要30秒，而我希望它需要4-5秒。

我的课程如下：

public static class Researcher
{

    public static List<long> FindPosition(Stream stream, int searchPosition, long startIndex, byte[] searchPattern)
    {

        List<long> searchResults = new List<long>();
        stream.Position = startIndex;

        while (true)
        {
            if (stream.Position == 5000000000)
                return searchResults;

            var latestbyte = stream.ReadByte();
            if (latestbyte == -1) break;

            if (latestbyte == searchPattern[searchPosition])
            {
                searchPosition++;
                if (searchPosition == searchPattern.Length)
                {
                    searchResults.Add(stream.Position - searchPattern.Length);
                    return searchResults;
                }
            }
            else
            {
                searchPosition = 0;
            }
        }

        return searchResults;
    }

}

当我使用课程时：

foreach (long s in Researcher.FindPosition(fs, 0, 0, bytes searched))
{
    fs.Close();
    BinaryWriter binaryWriter = new BinaryWriter((Stream)File.Open(filePath, FileMode.Open, FileAccess.ReadWrite));
    binaryWriter.BaseStream.Seek(s + 0L, SeekOrigin.Begin);
    binaryWriter.Write(bytes wich replace);
    binaryWriter.Close();
}