FormattableStringFactory.cs

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namespace System.Runtime.CompilerServices;
 
public static class FormattableStringFactory
{
    private sealed class ConcreteFormattableString : FormattableString
    {
        private readonly string _format;
 
        private readonly object[] _arguments;
 
        public override string Format => _format;
 
        public override int ArgumentCount => _arguments.Length;
 
        internal ConcreteFormattableString(string format, object[] arguments)
        {
            _format = format;
            _arguments = arguments;
        }
 
        public override object[] GetArguments()
        {
            return _arguments;
        }
 
        public override object GetArgument(int index)
        {
            return _arguments[index];
        }
 
        public override string ToString(IFormatProvider formatProvider)
        {
            return string.Format(formatProvider, _format, _arguments);
        }
    }
 
    public static FormattableString Create(string format, params object?[] arguments)
    {
        if (format == null)
        {
            throw new ArgumentNullException("format");
        }
        if (arguments == null)
        {
            throw new ArgumentNullException("arguments");
        }
        return new ConcreteFormattableString(format, arguments);
    }
}