MainViewModel.cs

using Common.WPF;
//using WPF.Helpers;
using WPF.Model;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

namespace WPF.ViewModel
{
    public class MainViewModel : ModifyViewModel
    {
        public MainViewModel() : base()
        {
            //Items = new ObservableCollection<ItemViewModel>();
            //System.Windows.Data.BindingOperations.EnableCollectionSynchronization(Items, _lock);
            //CreatePanel = new CreatingViewModel(this);
            //IsAllDataHide = true;

            EnumTheorems = Enum.GetValues(typeof(EnumTheorem)).Cast<EnumTheorem>().ToList();
            SelectedTheorem = EnumTheorems.First();

            //AddItemCommand = new RelayCommand<ItemViewModel>(OnAddItem, item => Items.FirstOrDefault(e => e.Value == item.Value) == null);
            //RemoveItemCommand = new RelayCommand<ItemViewModel>(OnRemoveItem, item => !item.Readonly);
            //OpenFileCommand = new RelayCommand(OnOpenFile);
            //SwitchDataVisibleCommand = new RelayCommand(OnSwitchDataVisible);
            //ClearSearchCommand = new RelayCommand(OnClearSearch);
        }

        #region Поля и свойства

        public List<EnumTheorem> EnumTheorems { get; }

        private EnumTheorem _selectedTheorem;
        public EnumTheorem SelectedTheorem
        {
            set
            {
                _selectedTheorem = value;
                OnPropertyChanged(()=> SelectedTheorem);
                // do smth
            }

            get => _selectedTheorem;
        }

        #endregion

        #region Методы и команды

        public void OnLoad()
        {
            //LoadData(App.DataFilePath);
            //LoadDataAsync(App.DataFilePath, true);
        }

        #endregion

    }
}