Can I add an interface to a class?

[mrpmorris]

I see the [NotifyPropertyChanged] example used often.

When adding an interface in PostSharp, if I recall correctly, you either had to add the interface yourself with empty methods and PostSharp would replace the method - or the interface was added post-compile and whenever you wanted to pass your object to something expecting INotifyPropertyChanged you'd have to do something like (INotifyPropertyChanged)(object)myObject, and lose all compile-time type safety checking.

Is this the case with Metalama, or can you add interfaces via aspects that are recognised at compile time?

[NotifyPropertyChanged]
public class Person
{
  public void DoSomething()
  {
    SomeStaticClass.DoSomethingWithAnInstanceOfINotifyPropertyChanged(this);
  }
}

[prochan2]

With Metalama, this is not the case anymore. See the NotifyPropertyChanged example at https://try.metalama.net/#inpc or https://github.com/postsharp/Metalama.Samples/tree/master/src/Metalama.Samples.NotifyPropertyChanged .

In the Main method, we're referencing the PropertyChanged event from the introduced INotifyPropertyChanged interface.

[mrpmorris]

Thank you!