问重构两个基本类？

EN

public class LanguageCode
{
    /// <summary>
    /// Get the lowercase two-character ISO 639-1 language code.
    /// </summary>
    public readonly string Value;

    public LanguageCode(string language)
    {
        this.Value = new CultureInfo(language).TwoLetterISOLanguageName;
    }

    public static LanguageCode TryParse(string language)
    {
        if (language == null)
        {
            return null;
        }

        if (language.Length > 2)
        {
            language = language.Substring(0, 2);
        }

        try
        {
            return new LanguageCode(language);
        }
        catch (ArgumentException)
        {
            return null;
        }
    }
}

public class RegionCode
{
    /// <summary>
    /// Get the uppercase two-character ISO 3166 region/country code.
    /// </summary>
    public readonly string Value;

    public RegionCode(string region)
    {
        this.Value = new RegionInfo(region).TwoLetterISORegionName;
    }

    public static RegionCode TryParse(string region)
    {
        if (region == null)
        {
            return null;
        }

        if (region.Length > 2)
        {
            region = region.Substring(0, 2);
        }

        try
        {
            return new RegionCode(region);
        }
        catch (ArgumentException)
        {
            return null;
        }
    }
}