WPF_Practice/PacticeSolution/MVVMTextInputDetection/ViewModel/CalculateViewModel.cs

using MVVMTextInputDetection.Model;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace MVVMTextInputDetection.ViewModel
{
    class CalculateViewModel : INotifyPropertyChanged
    {
        public Calculate CalculateModel { get; set; }

        public event PropertyChangedEventHandler? PropertyChanged;

        public CalculateViewModel()
        {
            this.CalculateModel = new Calculate();
        }

        public int Number
        {
            get { return this.CalculateModel.Number; }
            set
            {
                CalculateModel.Number = value;
                OnPropertyChanged("Number");

                CheckNumberRange(this.CalculateModel.Number);
            }
        }

        private void CheckNumberRange(int number)
        {
            if (number > 99 || number < 0)
                MessageBox.Show("Number range exceeded!");
        }

        protected void OnPropertyChanged(string propertyName)
        {
            this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}