Notify Attribute

The [Notify] attribute generates boilerplate for property change notification, so you don’t have to manually write INotifyPropertyChanged logic. It is designed for MVVM scenarios where you want clean view-models without repeating the same patterns.

✨ What it does

Normally you would write:

public class Person : INotifyPropertyChanged { private string _name;
public string Name
{
    get => _name;
    set
    {
        if (_name == value) return;

        _name = value;
        OnPropertyChanged(nameof(Name));
    }
}
public event PropertyChangedEventHandler? PropertyChanged;
protected void OnPropertyChanged(string propertyName)
    => PropertyChanged?.Invoke(this, new(propertyName));
}

With [Notify], you simply declare the backing field:

public partial class Person 
{ 
    [Notify] 
    private string _name; 
} 

The generator creates the property, backing logic, and notification code automatically.

🎯 Benefits

No duplicated OnPropertyChanged code Strongly-typed, compiler-generated properties Easier refactoring (rename the field → property updates automatically) Less noise in your view-models

🔎 Generated property

From the field: [Notify] private string _name; The generator produces something like:

public string Name { 
    get => _name; 
    set 
    { 
        if (_name == value) return;
        _name = value;
        OnPropertyChanged(nameof(Name));
    }
} 

The exact output may vary slightly, but the behavior is always the same.

📌 Notes

Works in any class marked partial Requires INotifyPropertyChanged support in your base type Generated code is placed in a .g.cs file — do not edit it

📄 How Notify Works

When you mark a backing field with [Notify], the generator:

• Ensures the type implements INotifyPropertyChanged
• Generates a public property for the field
• Raises 'OnPropertyChanged' when the value changes
• Skips notifications when the value hasn’t changed
• (Optional) generates strongly-typed change hooks

If hooks are enabled for the field, the following methods are available:

• OnXChanging(oldValue, ref newValue, ref cancel)
• OnXChanged(oldValue, newValue)

Use these to:

• validate and cancel changes
• modify the incoming value (coercion)
• react to changes after assignment

The final property change event is raised only after the value is successfully updated.