資本字母之間創造空間和跳躍空間之間的連續

Question

我去創造空間「ThisCourse」的方式來「這門課程」

Add Space Before Capital Letter By (EtienneT) LINQ Statement

，但我不能

創造空間Betweeen這種「 ThisCourseID「爲」此課程ID「之間沒有」ID「之間的空間

有沒有辦法在Linq做到這一點？

Answer 1

好吧，如果它是一個單一的LINQ語句...

var s = "ThisCourseIDMoreXYeahY"; 
s = string.Join(
     string.Empty, 
     s.Select((x,i) => (
      char.IsUpper(x) && i>0 && 
      (char.IsLower(s[i-1]) || (i<s.Count()-1 && char.IsLower(s[i+1]))) 
     ) ? " " + x : x.ToString())); 
Console.WriteLine(s); 

輸出：「This Course ID More X Yeah Y」

Answer 2

var s = "ThisCourseID"; 

for (var i = 1; i < s.Length; i++) 
{ 
    if (char.IsLower(s[i - 1]) && char.IsUpper(s[i])) 
    { 
     s = s.Insert(i, " "); 
    } 
} 

Console.WriteLine(s); // "This Course ID" 

您可以改善這種使用StringBuilder的，如果你要使用這個在很長的字符串，但你的目的，你提出的，它應該只是罰款。

FIX：

var s = "ThisCourseIDSomething"; 

for (var i = 1; i < s.Length - 1; i++) 
{ 
    if (char.IsLower(s[i - 1]) && char.IsUpper(s[i]) || 
     s[i - 1] != ' ' && char.IsUpper(s[i]) && char.IsLower(s[i + 1])) 
    { 
     s = s.Insert(i, " "); 
    } 
} 

Console.WriteLine(s); // This Course ID Something 

Answer 3

你不需要LINQ - 但你可以「枚舉」和使用拉姆達，使其更通用...
（雖然不知道是否有任何這使得感覺）

static IEnumerable<string> Split(this string text, Func<char?, char?, char, int?> shouldSplit) 
{ 
    StringBuilder output = new StringBuilder(); 
    char? before = null; 
    char? before2nd = null; 
    foreach (var c in text) 
    { 
     var where = shouldSplit(before2nd, before, c); 
     if (where != null) 
     { 
      var str = output.ToString(); 
      switch(where) 
      { 
       case -1: 
        output.Remove(0, str.Length -1); 
        yield return str.Substring(0, str.Length - 1); 
        break; 
       case 0: default: 
        output.Clear(); 
        yield return str; 
        break; 
      } 
     } 
     output.Append(c); 
     before2nd = before; 
     before = c; 
    } 
    yield return output.ToString(); 
} 

...並稱之爲像這樣...

static IEnumerable<string> SplitLines(this string text) 
    { 
     return text.Split((before2nd, before, now) => 
     { 
      if ((before2nd ?? 'A') == '\r' && (before ?? 'A') == '\n') return 0; // split on 'now' 
      return null; // don't split 
     }); 
    } 
    static IEnumerable<string> SplitOnCase(this string text) 
    { 
     return text.Split((before2nd, before, now) => 
     { 
      if (char.IsLower(before ?? 'A') && char.IsUpper(now)) return 0; // split on 'now' 
      if (char.IsUpper(before2nd ?? 'a') && char.IsUpper(before ?? 'a') && char.IsLower(now)) return -1; // split one char before 
      return null; // don't split 
     }); 
    } 

...某處...

 var text = "ToSplitOrNotToSplitTHEQuestionIsNow"; 
     var words = text.SplitOnCase(); 
     foreach (var word in words) 
      Console.WriteLine(word); 

     text = "To\r\nSplit\r\nOr\r\nNot\r\nTo\r\nSplit\r\nTHE\r\nQuestion\r\nIs\r\nNow"; 
     words = text.SplitLines(); 
     foreach (var word in words) 
      Console.WriteLine(word); 

:)