Base class vor a MVVM ViewModel

ViewModelBase.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;

namespace Template.Project.ViewModels
{
    public class ViewModelBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        private readonly Dictionary<string, object> _properties;


        public ViewModelBase()
        {
            // Makes sure that the internal hash table won't get resized 
            // while being filled.
            var projectedSize = GetType().GetProperties().Length / 0.7;
            var size = (int)Math.Ceiling(projectedSize);
            _properties = new Dictionary<string, object>(size);
        }

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

        protected virtual T Get<T>(string propertyName)
        {
            if (!_properties.ContainsKey(propertyName))
            {
                return default(T);
            }
            return (T)_properties[propertyName];
        }

        protected virtual void Set(string propertyName, object value)
        {
            _properties[propertyName] = value;
            OnPropertyChanged(propertyName);
        }
    }
}

Works with the propvm snippet.