14.05.2022/ServiceDEMO/Class/ParticalClass.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ServiceDEMO
{
    public partial class Service
    {
        public string PathImage => MainImagePath == null ? Environment.CurrentDirectory + @"\Услуги школы\picture.png" : Environment.CurrentDirectory + "\\" + MainImagePath;

        public double DurationInMinutes => TimeSpan.FromSeconds(DurationInSeconds).TotalMinutes;

        public string DefaultCost => Discount == 0 ? "" : Convert.ToDouble(Cost).ToString();

        public double DiscountCost => Discount == 0 ? Convert.ToDouble(Cost) : Convert.ToDouble(Cost) * Convert.ToDouble(1 - Discount);

        public string DiscountPercent => Discount == 0 ? "" : "^ скидка " + (Discount * 100).ToString() + "%";
    }
}