读取和编辑文件的内容 [英] reading and editing contents of file

问题描述

  AA 
 AA AA AA 
 AA AA AA AA AA AA 
 AA AA AA 
 file.txt 
 0 
  

AA表示一位或两位数字（每个数字的长度不一定是2），file.txt是文件的名称。我需要一个非常快速的方法来获取文件名。另外，我需要用1替换最后的0。如果文件末尾没有0（可选），我需要在新行添加1。这里是我现在的代码：
$ b $ pre $ StringBuilder sb = new StringBuilder（\r\\\
1）;
string txt = File.ReadAllText（args [0]）;
string [] lines = txt.Split（'\\\
'）;
string name = lines [4];

if（lines.Length！= 6）//检查EOF是否为0。
txt + = sb.ToString（）;
else
txt = txt.Substring（0，txt.Length - 1）+'1'; //将0替换为1.

File.WriteAllText（args [0]，txt）;
Console.WriteLine（name）;


然而，我想知道是否有更快的方法来做到这一点（无需加载在内存中的文件也许）。我必须处理大量这样的文件，所以保存十分之一将是非常有用的。

解决方案

  var lines = new List< string>（File.ReadAllLines（args [0]））; 
 string name = lines [4]; 
 
 if（lines.Length！= 6）//检查EOF是否为0。 
 lines.Add（1）; 
 else 
 lines [5] =1; 
 
 File.WriteAllLines（args [0]，lines）; 
 Console.WriteLine（name）; 
  

I have a file which is in this format:

AA
AA AA AA
AA AA AA AA AA AA
AA AA AA
file.txt
0

Where AA represents a one or two digit number (the length of each doesn't have to be 2), and file.txt is the name of a file. I need a very fast method to obtain the file name. Also, I need to replace the final 0 with 1. If there is no 0 in the file at the end (its optional), I need to append 1 on a new line. Here is my current code:

StringBuilder sb = new StringBuilder("\r\n1");
string txt = File.ReadAllText(args[0]);
string[] lines = txt.Split('\n');
string name = lines[4];

if (lines.Length != 6) // Check if EOF is 0 or not.
    txt += sb.ToString();
else
    txt = txt.Substring(0, txt.Length - 1) + '1'; // Replace 0 with 1.

File.WriteAllText(args[0], txt);
Console.WriteLine(name);

However, I was wondering if there was even a faster way to do this (without having to load the file in memory maybe). I have to process tons of files like this, so saving tenths would be extremely useful.

解决方案

var lines = new List<string>(File.ReadAllLines(args[0]));
string name = lines[4];

if (lines.Length != 6) // Check if EOF is 0 or not.
    lines.Add("1");
else
    lines[5] = "1";

File.WriteAllLines(args[0], lines);
Console.WriteLine(name);

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