替換文本文件中特定行中的字符串

Question

我想用文本文件中的String2替換String1。

文本文件：

This is line no 1. 
This is line no 2. 
This is line no 3. 
This is line no 4. 
This is line no 5. 
This is line no 6. 

字符串是：

String1 : no 
string2 : number 

我想這種類型的輸出線3〜5 「無」 到 「數字」 取代：

This is line no 1. 
This is line no 2. 
This is line number 3. 
This is line number 4. 
This is line number 5. 
This is line no 6. 

Answer 1

與Linq

string[] file = File.ReadAllLines(@"c:\yourfile.txt"); 
file = file.Select((x, i) => i > 1 && i < 5 ? x.Replace("no", "number") : x).ToArray(); 
File.WriteAllLines(@"c:\yourfile.txt", file); 

Answer 2

System.IO.File.ReadAllLines(string path)可能會幫助你。

它從文本文件創建字符串數組，您編輯該數組，然後使用System.IO.File.WriteAllLines保存它。

string[] Strings = File.ReadAllLines(/*File Path Here*/); 
Strings[2] = Strings[2].Replace("no", "number"); 
Strings[3] = Strings[3].Replace("no", "number"); 
Strings[4] = Strings[4].Replace("no", "number"); 
File.WriteAllLines(/*File Path Here*/, Strings); 

Answer 3

你應該試試這個：

// Read all lines from text file. 
String[] lines = File.ReadAllLines("path to file"); 
for(int i = 3; i <= 5; i++) // From line 3 to line 5 
{ 
    // Replace 'no' to 'number' in 3 - 5 lines 
    lines[i - 1] = lines[i - 1].Replace("no", "number"); 
} 

// Rewrite lines to file 
File.WriteAllLines("path to file", lines);