在LINQ爲了忽略串by子句C＃

Question

我有一個字符串的集合是如下：

"[Unfinished] Project task 1" 
"Some other Piece of work to do" 
"[Continued] [Unfinished] Project task 1" 
"Project Task 2" 
"Random other work to do" 
"Project 4" 
"[Continued] [Continued] Project task 1" 
"[SPIKE] Investigate the foo" 

我想要做的就是爲了這些字符串按字母順序基於字符串，而忽略了廣場上的值括號。所以我想最終的結果是：

"[SPIKE] Investigate the foo" 
"Project 4" 
"[Continued] [Continued] Project task 1" 
"[Continued] [Unfinished] Project task 1" 
"[Unfinished] Project task 1" 
"Project Task 2" 
"Random other work to do" 
"Some other Piece of work to do" 

問：

怎麼能這樣在LINQ來實現，這是我必須：

collection.OrderBy(str => str) 

Answer 1

給出一個簡單的正則表達式：

var rx = new Regex(@"\[[^]]*\] *"); 

，搜索括號內的文字（後跟可選空格），您可以：

var ordered = collection.OrderBy(str => rx.Replace(str, string.Empty)); 

這會刪除括號內的文字，以文字排序。

注意，沒有「二次排序」在這裏，所以：

"[Continued] [Unfinished] Project task 1" 
"[Continued] [Continued] Project task 1" 

將保持在相同的順序寫入（未完，待續）並不會逆轉。

如果你想訂購的二次，然後：

var ordered = collection 
    .OrderBy(str => rx.Replace(str, string.Empty)) 
    .ThenBy(str => str); 

使用整個字符串作爲二次訂貨會是好的。但隨後：

"[Continued] [Unfinished] project task 1" 
"[Continued] project task 1" 

仍將作爲寫入（小寫字母是後的[]以Unicode），同時

"[Continued] [Unfinished] Project task 1" 
"[Continued] Project task 1" 

將變得

"[Continued] Project task 1" 
"[Continued] [Unfinished] Project task 1" 

因爲上殼體字母在Unicode之前是[]。

Answer 2

這聽起來像你應該編寫一個方法來檢索「不在括號內的字符串部分」（例如使用正則表達式）。然後你可以使用：

var ordered = collection.OrderBy(RemoveTextInBrackets); 

你RemoveTextInBrackets方法可能只想在字符串的開始刪除的東西，也是繼它的空間。

完整的示例：

using System; 
using System.Linq; 
using System.Text.RegularExpressions; 

public class Program 
{ 
    private static readonly Regex TextInBrackets = new Regex(@"^(\[[^\]]*\])*"); 

    public static void Main() 
    { 
     var input = new[] 
     { 
      "[Unfinished] Project task 1 bit", 
      "Some other Piece of work to do", 
      "[Continued] [Unfinished] Project task 1", 
      "Project Task 2", 
      "Random other work to do", 
      "Project 4", 
      "[Continued] [Continued] Project task 1", 
      "[SPIKE] Investigate the foo", 
     }; 

     var ordered = input.OrderBy(RemoveTextInBrackets); 

     foreach (var item in ordered) 
     { 
      Console.WriteLine(item); 
     } 
    } 

    static string RemoveTextInBrackets(string input) => 
     TextInBrackets.Replace(input, ""); 
} 

Answer 3

嘗試擴展方法的一些組合如下所示：

inputList.OrderBy(x=> x.Contains("]")? x.Substring(x.LastIndexOf("]")):x) 

Working Example

Answer 4

與上述類似的建議，這裏是我的實現。

var newCollection = collection.OrderBy((s) => 
    { 
     if (s.Contains("]")) 
     { 
      string pattern = "\\[(.*?)\\] "; 
      Regex rgx = new Regex(pattern); 
      return rgx.Replace(s, ""); 
     } 
     else 
     { 
      return s; 
     } 
    }).ToList(); 
    }