namespace API.Models.DataClasses { public readonly record struct SixDigitInt { public int Value { get; } public SixDigitInt(int value) { if (value < 0 || value > 999999) throw new ArgumentOutOfRangeException(nameof(value), "Wert muss zwischen 0 und 999999 liegen."); Value = value; } public override string ToString() => Value.ToString("D6"); public static implicit operator int(SixDigitInt v) => v.Value; } }