initial commit

CSharp/Core/Mvvm.Core/Mvvm.Core.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

CSharp/Core/Mvvm.Core/ObservableObject.cs

@@ -0,0 +1,21 @@
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+
+namespace Mvvm.Core;
+
+public class ObservableObject : INotifyPropertyChanged
+{
+    protected bool Set<TValue>(ref TValue field, TValue newValue, [CallerMemberName] string? propertyName = null)
+    {
+        if (EqualityComparer<TValue>.Default.Equals(field, newValue)) return false;
+        field = newValue;
+        OnPropertyChanged(propertyName);
+
+        return true;
+    }
+
+    public event PropertyChangedEventHandler? PropertyChanged;
+
+    protected virtual void OnPropertyChanged([CallerMemberName] string? propertyName = null)
+        => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+}

CSharp/Core/Mvvm.Core/ViewModel.cs

@@ -0,0 +1,3 @@
+namespace Mvvm.Core;
+
+public class ViewModel : ObservableObject { /* skip */ }