AvaloniaCaptcha/Captcha/ViewModels/CalculatorViewModel.cs

using System;
using Captcha.Views;
using System.Collections.Generic;
using ReactiveUI;
using Tmds.DBus.Protocol;

namespace Captcha.ViewModels
{
	public class CalculatorViewModel : ReactiveObject
	{
        string valueselect = "";
        double first = 0;
        double second = 0;
        double result = 0;
        string plus = "+";
        string minus = "-";
        string pow = "*";
        string del = "/";
        public List<string> Arifmetica 
        {
            get => Models.ArifmClass.Do;
        }
        public double FirstCount
        {
            get => first;
            set
            {
                this.RaiseAndSetIfChanged(ref first, value);
            }
        }
        public double SecondCount
        {
            get => second;
            set
            {
                this.RaiseAndSetIfChanged(ref second, value);
            }
        }
        public void Process()
        {
            if(Does == plus)
            {
                result = FirstCount + SecondCount;
                Result++;
                Result--;
            }
            else if (Does == minus)
            {
                result = FirstCount - SecondCount;
                Result++;
                Result--;
            }
            else if (Does == pow)
            {
                result = FirstCount * SecondCount;
                Result++;
                Result--;
            }
            else if (Does == del)
            {
                result = FirstCount / SecondCount;
                Result++;
                Result--;
            }
        }
        public double Result
        {
            get => result;
            set
            {
                this.RaiseAndSetIfChanged(ref result, value);
            }
        }
        public string Does
        {
            get => valueselect;
            set
            {
                if (value == "Сумма")
                {
                    this.RaiseAndSetIfChanged(ref valueselect, plus);
                }
                else if (value == "Разность")
                {
                    this.RaiseAndSetIfChanged(ref valueselect, minus);
                }
                else if (value == "Умножение")
                {
                    this.RaiseAndSetIfChanged(ref valueselect, pow);
                }
                else if (value == "Деление")
                {
                    this.RaiseAndSetIfChanged(ref valueselect, del);
                }
            }
        }
        
    }
}