RegionInfo.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.Globalization;
 
public class RegionInfo
{
    private string _name;
 
    private readonly CultureData _cultureData;
 
    internal static volatile RegionInfo s_currentRegionInfo;
 
    public static RegionInfo CurrentRegion
    {
        get
        {
            RegionInfo regionInfo = s_currentRegionInfo;
            if (regionInfo == null)
            {
                regionInfo = new RegionInfo(CultureData.GetCurrentRegionData());
                regionInfo._name = regionInfo._cultureData.RegionName;
                s_currentRegionInfo = regionInfo;
            }
            return regionInfo;
        }
    }
 
    public virtual string Name => _name;
 
    public virtual string EnglishName => _cultureData.EnglishCountryName;
 
    public virtual string DisplayName => _cultureData.LocalizedCountryName;
 
    public virtual string NativeName => _cultureData.NativeCountryName;
 
    public virtual string TwoLetterISORegionName => _cultureData.TwoLetterISOCountryName;
 
    public virtual string ThreeLetterISORegionName => _cultureData.ThreeLetterISOCountryName;
 
    public virtual string ThreeLetterWindowsRegionName => ThreeLetterISORegionName;
 
    public virtual bool IsMetric => _cultureData.MeasurementSystem == 0;
 
    public virtual int GeoId => _cultureData.GeoId;
 
    public virtual string CurrencyEnglishName => _cultureData.CurrencyEnglishName;
 
    public virtual string CurrencyNativeName => _cultureData.CurrencyNativeName;
 
    public virtual string CurrencySymbol => _cultureData.CurrencySymbol;
 
    public virtual string ISOCurrencySymbol => _cultureData.ISOCurrencySymbol;
 
    public RegionInfo(string name)
    {
        if (name == null)
        {
            throw new ArgumentNullException("name");
        }
        if (name.Length == 0)
        {
            throw new ArgumentException(SR.Argument_NoRegionInvariantCulture, "name");
        }
        _cultureData = CultureData.GetCultureDataForRegion(name, useUserOverride: true) ?? throw new ArgumentException(SR.Format(SR.Argument_InvalidCultureName, name), "name");
        if (_cultureData.IsNeutralCulture)
        {
            throw new ArgumentException(SR.Format(SR.Argument_InvalidNeutralRegionName, name), "name");
        }
        _name = _cultureData.RegionName;
    }
 
    public RegionInfo(int culture)
    {
        switch (culture)
        {
        case 127:
            throw new ArgumentException(SR.Argument_NoRegionInvariantCulture);
        case 0:
            throw new ArgumentException(SR.Format(SR.Argument_CultureIsNeutral, culture), "culture");
        case 3072:
            throw new ArgumentException(SR.Format(SR.Argument_CustomCultureCannotBePassedByNumber, culture), "culture");
        }
        _cultureData = CultureData.GetCultureData(culture, bUseUserOverride: true);
        _name = _cultureData.RegionName;
        if (_cultureData.IsNeutralCulture)
        {
            throw new ArgumentException(SR.Format(SR.Argument_CultureIsNeutral, culture), "culture");
        }
    }
 
    internal RegionInfo(CultureData cultureData)
    {
        _cultureData = cultureData;
        _name = _cultureData.RegionName;
    }
 
    public override bool Equals([NotNullWhen(true)] object? value)
    {
        if (value is RegionInfo regionInfo)
        {
            return Name.Equals(regionInfo.Name);
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        return Name.GetHashCode();
    }
 
    public override string ToString()
    {
        return Name;
    }
}