FormattableString.cs

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using System.Globalization;
 
namespace System;
 
public abstract class FormattableString : IFormattable
{
    public abstract string Format { get; }
 
    public abstract int ArgumentCount { get; }
 
    public abstract object?[] GetArguments();
 
    public abstract object? GetArgument(int index);
 
    public abstract string ToString(IFormatProvider? formatProvider);
 
    string IFormattable.ToString(string ignored, IFormatProvider formatProvider)
    {
        return ToString(formatProvider);
    }
 
    public static string Invariant(FormattableString formattable)
    {
        if (formattable == null)
        {
            throw new ArgumentNullException("formattable");
        }
        return formattable.ToString(CultureInfo.InvariantCulture);
    }
 
    public static string CurrentCulture(FormattableString formattable)
    {
        if (formattable == null)
        {
            throw new ArgumentNullException("formattable");
        }
        return formattable.ToString(CultureInfo.CurrentCulture);
    }
 
    public override string ToString()
    {
        return ToString(CultureInfo.CurrentCulture);
    }
}