Csharp 自然排序字母数字，如 C# 中的 Windows 资源管理器

我建议将字符串拆分成块，每个块要么全是数字，要么不是数字:"B01 001" -> {"B", "01", " ", "001"}. 然后比较这些块(比较两个全数字块是特例).

Code:(Fiddle)

public sealed class NaturalComparer : IComparer<string> {

  private static int CompareChunks(string x, string y) {
    if (x[0] >= '0' && x[0] <= '9' && y[0] >= '0' && y[0] <= '9') {
      string tx = x.TrimStart('0');
      string ty = y.TrimStart('0');

      int result = tx.Length.CompareTo(ty.Length);

      if (result != 0)
        return result;

      result = tx.CompareTo(ty);

      if (result != 0)
        return result;
    }
    
    return string.Compare(x, y);
  }

  public int Compare(string? x, string? y) {
    if (ReferenceEquals(x, y))
      return 0;
    if (x is null)
      return -1;
    if (y is null)
      return +1;

    var itemsX = Regex
      .Split(x, "([0-9]+)")
      .Where(item => !string.IsNullOrEmpty(item))
      .ToList();

    var itemsY = Regex
      .Split(y, "([0-9]+)")
      .Where(item => !string.IsNullOrEmpty(item))
      .ToList();

    for (int i = 0; i < Math.Min(itemsX.Count, itemsY.Count); ++i) {
      int result = CompareChunks(itemsX[i], itemsY[i]);

      if (result != 0)
        return result;
    }

    return itemsX.Count.CompareTo(itemsY.Count);
  }
}

Demo:个

string[] demo = new string[] {
    "B01 002", 
    "B01 0010", 
    "01", 
    "B01 001", 
    "B10 001", 
    "B01 01", 
    "1", 
    "B1 001", 
    "B02 001", 
    "A1"
};

Array.Sort(demo, new NaturalComparer());

Console.WriteLine(string.Join(Environment.NewLine, demo));

Output:个

01
1
A1
B01 001
B01 01
B01 002
B01 0010
B1 001
B02 001
B10 001