Converts a string to title case.

Use Regex.Matches() with an appropriate regular expression to break the string into words.
Use string.Join() and string.ToLower() to convert the words to lowercase and combine them adding ` as a separator. UseCultureInfo.TextInfo.ToTitleCase()` on the result to convert it to title case.

代码实现

using System.Globalization;
using System.Text.RegularExpressions;

public static partial class _30s 
{
  public static string ToTitleCase(string str) 
  {
    Regex pattern = new Regex(@"[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+");
    return new CultureInfo("en-US", false)
      .TextInfo
      .ToTitleCase(
        string.Join(" ", pattern.Matches(str)).ToLower()
      );
  }
}

使用样例

_30s.ToTitleCase("some_database_field_name"); // "Some Database Field Name"
_30s.ToTitleCase("Some label that needs to be title-cased"); // "Some Label That Needs To Be Title Cased"
_30s.ToTitleCase("some-package-name"); // "Some Package Name"
_30s.ToTitleCase("some-mixed_string with spaces_underscores-and-hyphens"); // "Some Mixed String With Spaces Underscores And Hyphens"