Fody.PropertyChanged doesn't fire on inherited Property

Question

I have a Control which inherits from NumericUpDown in WinForms.

I want to handle changes to the DecimalPlaces-Property of NumericUpDown, therefore I have both tried declaring a

void OnDecimalPlacesChanged()
{
    MessageBox.Show("Moeeep");
}

and also manually subscribing the PropertyChanged-event in the ctor manually. It seems to just not fire when I update DecimalPlaces and I have no idea why.

Can you show some more code? Sure you didn't miss the `override` on `void OnDecimalPlacesChanged()`? — Patrick Hofman, Dec 03 '15 at 07:56
There is no method to override. This is a convention by Fody.PropertyChanged. How ever, as I said the event doen't fire, no matter what way I am subscribing — nozzleman, Dec 03 '15 at 07:59

score 3 · Accepted Answer · answered Dec 03 '15 at 08:21

3

Since Control does not implement INotifyPropertyChanged, only your class does. Because of that, the Control doesn't raise any event when the DecimalPlaces changes. No framework can inject that into their code.

For now, the best thing you have is to override the UpdateEditText method. It is called when the DecimalPlaces property changes. Note that this is of course not the only reason the method is called, so you might have a problem there...

answered Dec 03 '15 at 08:21

Patrick Hofman

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Something like https://harmony.pardeike.net/articles/patching.html could actually inject that into the base class – StayOnTarget Aug 06 '22 at 21:59

Fody.PropertyChanged doesn't fire on inherited Property

1 Answers1