Temperatura.cs

using System;
using System.Globalization;

namespace Cap06_FormatoParseo
{
    class Temperatura : IFormattable
    {
        private decimal temperatura;

        public Temperatura(decimal temperatura)
        {
            if (temperatura < -273.15m)
            {
                throw new ArgumentOutOfRangeException(String.Format("{0} is menor que el valor absoluto zero.",
                    temperatura));
            }

            this.temperatura = temperatura;
        }

        public decimal Celcius
        {
            get
            {
                return temperatura;
            }
        }

        public decimal Fahrenheit
        {
            get { return temperatura *9/5 + 32; }
        }

        public decimal Kelvin
        {
            get { return temperatura + 273.15m;}
        }

        public override string ToString()
        {
            return this.ToString("G", CultureInfo.CurrentCulture);
        }

        public string ToString(string format)
        {
            return this.ToString(format, CultureInfo.CurrentCulture);
        }

        public string ToString(string format, IFormatProvider formatProvider)
        {
            if (String.IsNullOrEmpty(format))
            {
                format = "G";
            }

            if (formatProvider == null)
            {
                formatProvider = CultureInfo.CurrentCulture;
            }

            switch (format.ToUpperInvariant())
            {
                case "G":
                case "C":
                    return temperatura.ToString("F2", formatProvider) + " °C";
                case "F":
                    return Fahrenheit.ToString("F2", formatProvider) + " °F";
                case "K":
                    return Kelvin.ToString("F2", formatProvider) + " °K";
                default:
                    throw new FormatException(String.Format("La cadena de formato {0} no está soportada.",
                        format));
            }
        }
    }
}