Describe the bug

OnPropertyChanging is not called for a generated property when using the NotifyPropertyChangedFor attribute.

Steps to reproduce

Using this class:

public partial class MyObject : ObservableObject
{
  [ObservableProperty]
  [NotifyPropertyChangedFor(nameof(FullName))]
  private string name;

  [ObservableProperty]
  [NotifyPropertyChangedFor(nameof(FullName))]
  private string surname;

  public string FullName => $"{Name} {Surname}";

  protected override void OnPropertyChanging(PropertyChangingEventArgs e)
  {
    base.OnPropertyChanging(e);
    
    // This is never called for FullName
    Debug.Assert(e.PropertyName != nameof(FullName)); 
  }
}

The following code should cause OnPropertyChanging to be called for property FullName:

var o = new MyObject();
o.Name = "Jack";

Expected behavior

I expected OnPropertyChanging to be called also for property FulleName when Name is assigned a new value.

IDE and version

VS 2022

IDE version

17.2.12

Nuget packages

• CommunityToolkit.Common
• CommunityToolkit.Diagnostics
• CommunityToolkit.HighPerformance
• CommunityToolkit.Mvvm (aka MVVM Toolkit)

Nuget package version(s)

8.2.0

Help us help you

No, just wanted to report this