C＃ - 检测文件中的编码，使用找到的编码将更改写入文件

I wrote a small program for iterating through a lot of files and applying some changes where a certain string match is found, the problem I have is that different files have different encodings. So what I would like to do is check the encoding, then overwrite the file in its original encoding.I wrote a small program for iterating through a