C＃ - 不規則換行符讀取文件

Question

我想讀與C＃的文本文件，即格式如下：

this is a line\r\n 
this is a line\r 
\r\n 
this is a line\r 
\r\n 
this is a line\r 
\r\n 
this is a line\r\n 
this is a line\r 
\r\n 
etc... 

我從文件讀取每一行

StreamReader.ReadLine() 

但不保留換行符。我需要知道/檢測有哪些新的行字符，因爲我正在計算每行的字節數。例如：

如果線與字符\r結束，線路包括：((nr-of-bytes-in-line) + 1 byte)字節（根據編碼類型的課程），如果符合\r\n結束時，線包括：((nr-of-bytes-in-line) + 2 bytes)字節。

編輯：

我有解決方案的基礎上，以色列壇的答案。順便說一句：喬恩Skeet也建議它。我已經實現了ReadLine的重寫版本，以便它包含新的行字符。這是重寫的函數的代碼：

public override String ReadLine() 
    { 
     StringBuilder sb = new StringBuilder(); 
     while (true) 
     { 
      int ch = Read(); 
      if (ch == -1) 
      { 
       break; 
      } 
      if (ch == '\r' || ch == '\n') 
      { 
       if (ch == '\r' && Peek() == '\n') 
       { 
        sb.Append('\r'); 
        sb.Append('\n'); 
        Read(); 
        break; 
       } 
       else if(ch == '\r' && Peek() == '\r') 
       { 
        sb.Append('\r'); 
        break; 
       } 
      } 
      sb.Append((char)ch); 
     } 
     if (sb.Length > 0) 
     { 
      return sb.ToString(); 
     } 
     return null; 
    } 

Answer 1

這是Readline正根據.NET資源實現方式：

// Reads a line. A line is defined as a sequence of characters followed by 
     // a carriage return ('\r'), a line feed ('\n'), or a carriage return 
     // immediately followed by a line feed. The resulting string does not 
     // contain the terminating carriage return and/or line feed. The returned 
     // value is null if the end of the input stream has been reached. 
     // 
     public virtual String ReadLine() 
     { 
      StringBuilder sb = new StringBuilder(); 
      while (true) { 
       int ch = Read(); 
       if (ch == -1) break; 
       if (ch == '\r' || ch == '\n') 
       { 
        if (ch == '\r' && Peek() == '\n') Read(); 
        return sb.ToString(); 
       } 
       sb.Append((char)ch); 
      } 
      if (sb.Length > 0) return sb.ToString(); 
      return null; 
     } 

，你可以看到，如果你可以添加一個句子是這樣的：

if (ch == '\r') 
{ 
    //add the amount of bytes wanted 
} 
if (ch == '\n') 
{ 
    //add the amount of bytes wanted 
} 

或做任何你想要的操作。