Converts a string to camel 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,string.Replace()with a regular expression to remove spaces afterwards. Finally, useIEnumerable.Select()` on the result to convert the first character to lowercase and return a string from the result.

代码实现

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

public static partial class _30s 
{
  public static string ToCamelCase(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 string(
      new CultureInfo("en-US", false)
        .TextInfo
        .ToTitleCase(
          string.Join(" ", pattern.Matches(str)).ToLower()
        )
        .Replace(@" ", "")
        .Select((x, i) => i == 0 ? char.ToLower(x) : x)
        .ToArray()
    );
  }
}

使用样例

_30s.ToCamelCase("some_database_field_name"); // "someDatabaseFieldName"
_30s.ToCamelCase("Some label that needs to be title-cased"); // "someLabelThatNeedsToBeCamelized"
_30s.ToCamelCase("some-package-name"); // "somePackageName"
_30s.ToCamelCase("some-mixed_string with spaces_underscores-and-hyphens"); // "someMixedStringWithSpacesUnderscoresAndHyphens"