intergartions XLabs.* WIP MVVM

BookAStar/BookAStar/ViewModels/ViewModelBase.cs

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+using BookAStar.Helpers;
+using BookAStar.Interfaces;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BookAStar.ViewModels
+{
+    public class ViewModelBase : IModelViewModel
+    {
+        public string Title { get; set; }
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        public void SetState<T>(Action<T> action) where T : class, IModelViewModel
+        {
+            action(this as T);
+        }
+
+        protected virtual bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null)
+        {
+            if (object.Equals(storage, value)) return false;
+
+            storage = value;
+            OnPropertyChanged(propertyName);
+
+            return true;
+        }
+
+        protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
+        {
+            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
+        }
+
+        protected void OnPropertyChanged<T>(Expression<Func<T>> propertyExpression)
+        {
+            OnPropertyChanged( PropertySupport.ExtractPropertyName<T>( propertyExpression)); 
+        }
+    }
+}