閱讀文本文件中的所有行並添加它們C＃

Question

我一直在研究這個問題一段時間，我有點卡住了。我有一個文本文件，需要循環讀取所有行，然後將所有子字符串添加到一個最終數字中。問題是，我擁有的是正確讀取並僅爲文件中的第一行生成數字。我不確定是使用'while'還是'for each'。這裏是我的代碼：

string filePath = ConfigurationSettings.AppSettings["benefitsFile"]; 
    StreamReader reader = null; 
    FileStream fs = null; 
    try 
    { 
     //Read file and get estimated return. 
     fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite); 
     reader = new StreamReader(fs); 
     string line = reader.ReadLine(); 
     int soldToDate = Convert.ToInt32(Convert.ToDouble(line.Substring(10, 15))); 
     int currentReturn = Convert.ToInt32(soldToDate * .225); 

     //Update the return amount 
     updateCurrentReturn(currentReturn); 

任何建議將不勝感激。

Answer 1

您使用while循環這樣做，讀取每一行，並檢查，看看它hasn't returned null

string filePath = ConfigurationSettings.AppSettings["benefitsFile"]; 
    StreamReader reader = null; 
    FileStream fs = null; 
    try 
    { 
     //Read file and get estimated return. 
     fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite); 
     reader = new StreamReader(fs); 

     string line; 
     int currentReturn = 0; 
     while ((line = reader.ReadLine()) != null){ 
      int soldToDate = Convert.ToInt32(Convert.ToDouble(line.Substring(10, 15))); 
      currentReturn += Convert.ToInt32(soldToDate * .225); 
     } 

     //Update the return amount 
     updateCurrentReturn(currentReturn); 

    } 
    catch (IOException e){ 
    // handle exception and/or rethrow 
    } 

Answer 2

它很容易，只需使用File.ReadLines：

foreach(var line in File.ReadLines(filepath)) 
{ 
    //do stuff with line 
} 

Answer 3

這是一個很大的因爲它適用於大部分文本。

string text = File.ReadAllText("file directory"); 
foreach(string line in text.Split('\n')) 
{ 

}