將文本分割成最大長度的線條

Question

我有一個很長的字符串，我想將它放在一個小的字段中。爲了實現這一點，我把字符串分成空白行。算法如下：

public static string BreakLine(string text, int maxCharsInLine) 
    { 
     int charsInLine = 0; 
     StringBuilder builder = new StringBuilder(); 
     for (int i = 0; i < text.Length; i++) 
     { 
      char c = text[i]; 
      builder.Append(c); 
      charsInLine++; 

      if (charsInLine >= maxCharsInLine && char.IsWhiteSpace(c)) 
      { 
       builder.AppendLine(); 
       charsInLine = 0; 
      } 
     } 
     return builder.ToString(); 
    } 

但是，如果有一個短的單詞，然後是一個較長的單詞，這會中斷。最大長度爲16的「foo howcomputerwork」不會中斷，但我希望這樣做。我以爲有一個想法是期待看到下一個空白出現在哪裏，但我不確定這是否會導致儘可能少的行數。

Answer 1

檢查字符的內容寫入字符串生成器之前，並與當前計數or它：

public static string BreakLine(string text, int maxCharsInLine) 
    { 
     int charsInLine = 0; 
     StringBuilder builder = new StringBuilder(); 
     for (int i = 0; i < text.Length; i++) 
     { 
      char c = text[i]; 
      if (char.IsWhiteSpace(c) || charsInLine >= maxCharsInLine) 
      { 
       builder.AppendLine(); 
       charsInLine = 0; 
      } 
      else 
      { 
       builder.Append(c); 
       charsInLine++;      
      } 
     } 
     return builder.ToString(); 
    } 

Answer 2

享受！

public static string SplitToLines(string text, char[] splitOnCharacters, int maxStringLength) 
{ 
    var sb = new StringBuilder(); 
    var index = 0; 

    while (text.Length > index) 
    { 
     // start a new line, unless we've just started 
     if (index != 0) 
      sb.AppendLine(); 

     // get the next substring, else the rest of the string if remainder is shorter than `maxStringLength` 
     var splitAt = index + maxStringLength <= text.Length 
      ? text.Substring(index, maxStringLength).LastIndexOfAny(splitOnCharacters) 
      : text.Length - index; 

     // if can't find split location, take `maxStringLength` characters 
     splitAt = (splitAt == -1) ? maxStringLength : splitAt; 

     // add result to collection & increment index 
     sb.Append(text.Substring(index, splitAt).Trim()); 
     index += splitAt; 
    } 

    return sb.ToString(); 
} 

注意splitOnCharacters和maxStringLength可以保存在應用程序的用戶設置區域。

Answer 3

稍微更新了一段代碼，@ dead.rabit有時會循環。

public static string SplitToLines(string text,char[] splitanyOf, int maxStringLength) 
    {    
     var sb = new System.Text.StringBuilder(); 
     var index = 0; 
     var loop = 0; 
     while (text.Length > index) 
     { 
      // start a new line, unless we've just started 
      if (loop != 0) 
      { 
       sb.AppendLine(); 
      } 

      // get the next substring, else the rest of the string if remainder is shorter than `maxStringLength` 
      var splitAt = 0; 
      if (index + maxStringLength <= text.Length) 
      { 
       splitAt = text.Substring(index, maxStringLength).LastIndexOfAny(splitanyOf); 
      } 
      else 
      { 
       splitAt = text.Length - index; 
      } 

      // if can't find split location, take `maxStringLength` characters 
      if (splitAt == -1 || splitAt == 0) 
      { 
       splitAt = text.IndexOfAny(splitanyOf, maxStringLength); 
      } 

      // add result to collection & increment index 
      sb.Append(text.Substring(index, splitAt).Trim()); 
      if(text.Length > splitAt) 
      { 
       text = text.Substring(splitAt + 1).Trim(); 
      } 
      else 
      { 
       text = string.Empty; 
      } 
      loop = loop + 1; 
     } 

     return sb.ToString(); 
    }