將循環輸出保存在文件中僅保存最後一次迭代

Question

我正在創建一個凱撒密碼解密/加密程序。我的程序從.txt文件讀取，顯示26個不同班次的所有輸出。

我在將輸出保存爲.txt時遇到問題：只有最終迭代的輸出是保存到文件的內容。我想保存所有26次迭代。

查看圖片的例子。

該循環，並寫入到文件中的代碼：

static void decryption() 
    { Console.ForegroundColor = ConsoleColor.DarkBlue; 
     Console.WriteLine ("\n*********************************** Decryption *********************************"); 
     Console.ResetColor(); 
     //pulls getPath from varables class 
     string path = globalVars.getPath(); 


    string encrypted_text = System.IO.File.ReadAllText(path); //String variable that contains the text from a file. To get the text, the method in a class SystemIO is ran to read the text. It expects a parameter, which is a file directory. 
    string decoded_text = " "; 
    int shift = 0; 
    char character = '0'; 
    encrypted_text = encrypted_text.ToUpper(); 

    char[] alphabet = new char[26] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' }; 

    Console.WriteLine("The encrypted text is \n{0}", encrypted_text);  //Display the encrypted text 

    for (int i = 0; i < alphabet.Length; i++)  //Start a loop which will display 25 different candidates of decipher 
    { 
     decoded_text = ""; 
     foreach (char c in encrypted_text) 
     { 
      character = c; 

      if (character == '\'' || character == ' ') 
       continue; 

      shift = Array.IndexOf(alphabet, character) - i;  //Define a shift which is the index of a character in an alphabet array, take away the itteration of this loop. Store the result in a variable 
      if (shift <= 0) 
       shift = shift + 26; 

      if (shift >= 26) 
       shift = shift - 26; 


      decoded_text += alphabet[shift]; 
     } 
     Console.WriteLine("\nShift {0} \n {1}", i + 1, decoded_text); 
    } 

     string filename; 
     string savePath; 

     string fileContent = decoded_text; 

     Console.WriteLine("What do you want to name your file??"); 
     filename = Console.ReadLine(); 

     Console.WriteLine("Where would you like to save your file??"); 
     savePath = Console.ReadLine(); 

File.WriteAllText(savePath + filename + ".txt", fileContent); 
     Console.WriteLine("Success"); 
     Console.WriteLine(Console.Read()); 
} 
}// ///////END OF DECRYPTION ////////// 

Answer 1

問題是這條線string fileContent = decoded_text; 您只是將fileContent分配給最後解碼的文本。要在循環之前修復這個put fileContent，然後在每個步驟中添加每個decodedText。

像這樣：

static void decryption() 
{ 

    // ... 
    string fileContent = ""; 

    for (int i = 0; i < alphabet.Length; i++) 
    { 
     // ... 
     fileContent += "Shift " + (i+1).ToString() + "\r\n" + decoded_text + "\r\n"; 
    } 

    // ... 
    File.WriteAllText(savePath + filename + ".txt", fileContent); 
} 

Answer 2

招行decoded_text=""前的for循環。這使得文件只包含代碼的最後一位。

您也可能想使用StringBuilder而不是附加字符串。這樣更有效率。

Answer 3

的問題是，你在寫作中你for循環decoded_text內容：

for (int i = 0; i < alphabet.Length; i++)  //Start a loop which will display 25 different candidates of decipher 
{ 
    decoded_text = ""; 
    foreach (char c in encrypted_text) 
    { 
     character = c; 

     if (character == '\'' || character == ' ') 
      continue; 

     shift = Array.IndexOf(alphabet, character) - i;  //Define a shift which is the index of a character in an alphabet array, take away the itteration of this loop. Store the result in a variable 
     if (shift <= 0) 
      shift = shift + 26; 

     if (shift >= 26) 
      shift = shift - 26; 


     decoded_text += alphabet[shift]; 
    } 
    Console.WriteLine("\nShift {0} \n {1}", i + 1, decoded_text); 
} 

你指定在你for環空字符串。然後在嵌套的foreach循環中爲其添加字符。但是，然後foreach結束，for循環再次迭代並用空字符串擦除它。

因此，要麼完全刪除它，要麼將其移動到別處，或者在清除之前將內容保存到文件中 - 我完全不明白您要做什麼。我的意思是，我瞭解凱撒密碼，但是你的帖子並不是很好。

這將是一個很好的時間來設置一些斷點，逐行掃描循環並學會使用調試工具。