WPF_Practice/PacticeSolution/MVVMButtonControl/ViewModel/ModelViewMain.cs

using MVVMButtonControl.Model;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

namespace MVVMButtonControl.ViewModel
{
    internal class ModelViewMain
    {
        public ObservableCollection<Buttons> _buttonCollections;

        public ICommand TestCommand { get; private set; }

        public ICommand SubButtonCommand { get; private set; }


        public ModelViewMain()
        {
            _buttonCollections = new ObservableCollection<Buttons>();
            this.TestCommand = new RelayCommand<object>(CommandMethod);
            this.SubButtonCommand = new RelayCommand<object>(SubCommandMethod);
        }

        public ObservableCollection<Buttons>  ButtonCollection
        {
            get { return _buttonCollections; }
            set
            {
                if (_buttonCollections != null)
                    _buttonCollections = value;
            }
        }

        private void CommandMethod(object parameter)
        {
            for (int i = 0; i < 4; i++)
            {
                this.ButtonCollection.Add(new Buttons { Name = $"Button {i}", SelectedColor = Brushes.Transparent });
            }
        }

        private void SubCommandMethod(object parameter)
        {
            for (int i = 0; i < this.ButtonCollection.Count; i++)
            {
                this.ButtonCollection[i].SelectedColor = Brushes.Transparent;
            }

            Buttons? selected = this.ButtonCollection.Where(b => b.Name.Equals(parameter.ToString())).SingleOrDefault();
            if (selected == null)
                return;

            selected.SelectedColor = Brushes.LightCoral;
        }
    }
}