依赖System.Data.Entity.Design包进行转换，而不是写几个正则去傻傻的匹配。

实测转换效果良好，可以识别people, woman, feet等特殊单复数单词。

简单使用

  • 单词转为单数形式

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    System.Data.Entity.Design.PluralizationServices.PluralizationService.CreateService(new CultureInfo("en")).Singularize("英文单词");

  • 单词转为复数形式

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    System.Data.Entity.Design.PluralizationServices.PluralizationService.CreateService(new CultureInfo("en")).Singularize("英文单词");

dll下载地址

System.Data.Entity.Design.dll 下载地址

封装为类

若需频繁使用此类功能，可以考虑封装为一个类

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using System.Data.Entity.Design.PluralizationServices;
using System.Globalization;

namespace Handlers
{
    
    /// <summary>
    /// 单词辅助方法
    /// </summary>
    /// <author name="CuratorC"></author>
    public static class WordHandler
    {
        // 利用静态属性达到单例模式的效果
        private static PluralizationService Service => _service ??= PluralizationService.CreateService(new CultureInfo("en"));
        private static PluralizationService _service = null;
        
        /// <summary>
        /// 将单词转换为单数形式
        /// </summary>
        /// <param name="word">单词</param>
        /// <author name="CuratorC"></author>
        /// <returns></returns>
        public static string ToSingular(string word)
        {
            return Service.Singularize(word);
        }
        
        /// <summary>
        /// 将单词转换为复数形式
        /// </summary>
        /// <param name="word"></param>
        /// <author name="CuratorC"></author>
        /// <returns></returns>
        public static string ToPlural(string word)
        {
            return Service.Pluralize(word);
        }
    }

    /// <summary>
    /// 单词多状态聚合类
    /// </summary>
    /// <author name="CuratorC"></author>
    public class MultipleWords
    {
        public string Singular;
        public string Plural;
        /// <summary>
        /// 构造方法
        /// </summary>
        /// <param name="word">单词</param>
        /// <author name="CuratorC"></author>
        public MultipleWords(string word)
        {
            Singular = WordHandler.ToSingular(word);
            Plural = WordHandler.ToPlural(Singular);
        }

        /// <summary>
        /// 设置新的单词
        /// </summary>
        /// <param name="word"></param>
        /// <author name="CuratorC"></author>
        /// <returns></returns>
        public MultipleWords Set(string word)
        {
            Singular = WordHandler.ToSingular(word);
            Plural = WordHandler.ToPlural(Singular);
            return this;
        }
    }
}

使用方法

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var words = new MultipleWords("people");
Console.WriteLine(words.Singular);
Console.WriteLine(words.Plural);
words = new MultipleWords("company");
Console.WriteLine(words.Singular);
Console.WriteLine(words.Plural);