Reorganization of files

App/MvvmStuff/BaseViewModel.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using FastMember;
+using Prism.Mvvm;
+
+namespace ModernWpfPlayground.MvvmStuff
+{
+    public abstract class BaseViewModel : BindableBase
+    {
+        protected BaseViewModel()
+        {
+            ObjectAccessor = ObjectAccessor.Create(this);
+        }
+
+        private readonly Dictionary<string, object> _values = new Dictionary<string, object>();
+        protected readonly ObjectAccessor ObjectAccessor;
+
+        protected IReadOnlyDictionary<string, object> Values => _values;
+
+        protected bool SetProperty<T>(T value, Action<T>? onChanged = null,
+            [CallerMemberName] string? propertyName = null)
+        {
+            if (propertyName == null) throw new ArgumentNullException(nameof(propertyName));
+            if (_values.TryGetValue(propertyName, out var obj) && Equals(value, obj)) return false;
+
+            _values[propertyName] = value!;
+            RaisePropertyChanged(propertyName);
+            onChanged?.Invoke(value);
+            return true;
+        }
+
+        protected T GetProperty<T>(T defaultValue = default, [CallerMemberName] string? propertyName = null)
+        {
+            if (propertyName == null) throw new ArgumentNullException(nameof(propertyName));
+            return Values.TryGetValue(propertyName, out var obj) ? (T)obj : defaultValue;
+        }
+
+        protected void ResetViewModel(Func<string, bool>? predicate = null)
+        {
+            IEnumerable<string> keys = _values.Keys;
+            if (predicate != null) keys = keys.Where(predicate);
+            foreach (var key in keys)
+            {
+                _values.Remove(key);
+                RaisePropertyChanged(key);
+            }
+        }
+
+        protected abstract IEnumerable<(string key, object? value)> GetViewModelItems();
+
+        protected void LoadViewModel()
+        {
+            var keysFromFile = new SortedSet<string>();
+            foreach (var (key, value) in GetViewModelItems())
+            {
+                keysFromFile.Add(key);
+                ObjectAccessor[key] = value;
+            }
+
+            ResetViewModel(x => !keysFromFile.Contains(x));
+        }
+    }
+}

App/MvvmStuff/DeserializationExtension.cs

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+using System;
+using System.Globalization;
+
+namespace ModernWpfPlayground.MvvmStuff
+{
+    public static class DeserializationExtension
+    {
+        public static object? Convert(object? value, Type propertyType)
+        {
+            if (value is null) return Activator.CreateInstance(propertyType);
+
+            if (propertyType.IsEnum && value is string s)
+            {
+                return Enum.Parse(propertyType, s);
+            }
+
+            return System.Convert.ChangeType(value, propertyType, CultureInfo.InvariantCulture);
+        }
+    }
+}