文本文件的阅读最后一行 [英] Read last line of text file
问题描述
我需要知道如何读取文本文件的最后一行。我需要找到行，然后将其加工成SQL数据库...我一直在阅读和周围淘网，但我挣扎着找到合适的方式来做到这一点。即：
I need to know how to read the last line of a text file. I need to find the line and then process it into a SQL database... I've been reading around and scouring the web but am battling to find the proper way to do this. I.e.:
- 找到文件的最后一行。
- 文件的过程最后一行。
我希望这是有道理的。
推荐答案
有两种方法：简单且效率低下，或窘况复杂，但有效率。这个复杂的版本假设一个健全的编码。
There are two ways: simple and inefficient, or horrendously complicated but efficient. The complicated version assumes a sane encoding.
除非你的文件的这样的大，你真的读不起这一切，我只是用：
Unless your file is so big that you really can't afford to read it all, I'd just use:
var lastLine = File.ReadLines("file.txt").Last();
请注意，这里使用的 File.ReadLines ，的不的的 File.ReadAllLines 。如果您使用.NET 3.5或更早版本你需要使用 File.ReadAllLines 或者自己写code - ReadAllLines 将读取的全部的文件到内存中一气呵成，而 readlines方法流了。
Note that this uses File.ReadLines, not File.ReadAllLines. If you're using .NET 3.5 or earlier you'd need to use File.ReadAllLines or write your own code - ReadAllLines will read the whole file into memory in one go, whereas ReadLines streams it.
否则，复杂的方法是使用类似<一个code href=\"http://stackoverflow.com/questions/452902/how-to-read-a-text-file-reversely-with-iterator-in-c-sharp\">this.它试图从文件末尾向后读取，处理污秽如UTF-8多字节字符。这不是令人愉快的。
Otherwise, the complicated way is to use code similar to this. It tries to read backwards from the end of the file, handling nastiness such as UTF-8 multi-byte characters. It's not pleasant.
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