如何逐行讀取文本文件並在c＃中將偶數行保存爲** even.txt **和奇數行以保存爲odd.txt **？

Question

如何逐行讀取文本文件並保存偶數編號行至even.txt和奇數編號行至odd.txt in c＃？

StreamReader dr=new StreamReader(@"C:\Users\Venkatesh\Desktop\sample.txt"); 
string ln=string.Empty; 
int c = 0; 
while (ln != null) 
{ 
    c += 1; 
    if (c%2 == 0){ 
     StreamWriter even = new StreamWriter(@"C:\even.txt"); 
     even.WriteLine(ln); 
    } 
    else { 
     StreamWriter odd = new StreamWriter(@"C:\odd.txt"); 
     odd.WriteLine(ln); 
    } 
} 

Answer 1

你需要的是這樣的：

string ln = string.Empty; 
int c = 0; 

using (StreamWriter odd = new StreamWriter(@"C:\Users\rdaniel\Desktop\odd.txt")) 
using (StreamWriter even = new StreamWriter(@"C:\Users\rdaniel\Desktop\even.txt")) 
using (StreamReader dr = new StreamReader(@"C:\Users\rdaniel\Desktop\example.txt")) 
{ 
    while (ln != null) 
    { 
     ln = dr.ReadLine(); 
     c += 1; 
     if (c % 2 == 0) 
     { 
      even.WriteLine(ln); 
     } 
     else 
     { 
      odd.WriteLine(ln); 
     } 
    } 
} 

Answer 2

而是打開/關閉在循環中的輸出文件，你可以做這樣的事情...

using (var odd = File.CreateText("odd.txt")) 
using (var even = File.CreateText("even.txt")) 
{ 
    int count = 0; 
    foreach (var line in File.ReadLines(filename)) 
    { 
     (count++ % 2 == 0 ? even : odd).WriteLine(line); 
    } 
}