從一個文本文件讀取文件並編輯編程每一行，並輸出它在另一個txt文件

Question

我有一個文本文件，該文件有鏈接列表如下：

<A title=Accept href="https://www.google.com/url?q=https%3A%2F%2Fregister.eragenx.com%2Freferral%3Freferrer%3Demail%26invitationToken%3D1f7ae07e4cb1ed96a7fc5f6de10376d9%26email%3Dlovessoumi.tra123456789soumit90%2540gmail.com&amp;sa=D&amp;sntz=1&amp;usg=AFQjCNGdIeh6LFs4H5TvysbSV7DjUk2Tuw" target=_blank>Sign Up Now For Free.</A> 

與我的程序和按鈕點擊的事件我想編輯文件的每一行如：

https://register.eragenx.com/referral?referrer=email&invitationToken=fd78d9fdf6281e033b389cb14e118f85&email=lovesleeping1234567.8sleepin.g97%40gmail.com 

這就是我想要的，但它似乎工作，我做錯了什麼？

public void editline() 
     { 


      string[] lines = File.ReadAllLines("link.txt"); 

      foreach (var line in lines) 
      { 
       line.Substring(51,171); 
       line.Replace("%3A", ":"); 
       line.Replace("%2F","/"); 
       line.Replace("%3F","?"); 
       line.Replace("%3D" , "="); 
       line.Replace("%26","&"); 

      } 

      File.WriteAllLines("output.txt",lines); 




     } 

我也試過這樣：

public void editline() 
     { 



      string[] lines = File.ReadAllLines("link.txt"); 



      foreach (var line in lines) 
      { 

       HttpUtility.UrlDecode(line.Substring(51, 171)); 


      } 


      File.WriteAllLines("output.txt", lines); 
} 

這：

public void editline() 
     { 


      string parsedLine = null; 
      string[] lines = File.ReadAllLines("link.txt"); 



      foreach (var line in lines) 
      { 


       parsedLine = line.Substring(51, 171); 
       parsedLine = line.Replace("%3A", ":"); 
       parsedLine = line.Replace("%2F", "/"); 
       parsedLine = line.Replace("%3F", "?"); 
       parsedLine = line.Replace("%3D", "="); 
       parsedLine = line.Replace("%26", "&"); 

      } 


      File.WriteAllLines("output.txt", lines); 
} 

但產量與從link.txt方法是使輸出沒有變化的聯繫.txt

請幫忙

Answer 1

原因line沒有改變是因爲你沒有存儲的substring和replace函數的結果。

應該是這樣的：

string parsedLine= null; 

foreach (var line in lines) 
{ 
    parsedLine = line.Substring(51,171); 
    parsedLine = parsedLine.Replace("%3A", ":"); 
    parsedLine = ... 
} 

//use parsedLine here... 

Answer 2

你應該使用HttpServerUtility.UrlDecode()方法在這裏找到： http://msdn.microsoft.com/en-us/library/6196h3wt(v=vs.110).aspx

Answer 3

public void editline() 
    { 
     string[] lines = File.ReadAllLines("link.txt"); 

     foreach (var line in lines) 
     { 
      line = line.Substring(51,171); 
      line = line.Replace("%3A", ":"); 
      line = line.Replace("%2F","/"); 
      line = line.Replace("%3F","?"); 
      line = line.Replace("%3D" , "="); 
      line = line.Replace("%26","&"); 

     } 

     File.WriteAllLines("output.txt",lines); 
    } 

看那替代方法。它返回修改後的字符串，它不會修改您傳入的字符串。