c# - Why does overriding GetHashCode() block INotifyPropertyChanged? -

c# - Why does overriding GetHashCode() block INotifyPropertyChanged? -

i have dead simple view model inherits inotifypropertychanged. after attempting create automated tests view model, ended overriding equals() , gethashcode(). tests passed, happy camper.

however, windows forms info bindings aren't reacting when property in view model changes. if comment gethashcode() implementation works expected, except tests.

here implementation:

public override int gethashcode() { unchecked { var hashcode = (_subject != null ? _subject.gethashcode() : 0); hashcode = (hashcode * 397) ^ (_message != null ? _message.gethashcode() : 0); hashcode = (hashcode * 397) ^ (_body != null ? _body.gethashcode() : 0); homecoming hashcode; } }

this resharper generated me.

why overriding gethashcode() stop info bindings picking on view model changes despite me calling propertychanged event?

i seek avoid adding code production code solely testing purposes. since implemented equals , gethashcode testing purposes, possible implement iequalitycomparer<t> , utilize in unit tests performs assertions.

c# winforms inotifypropertychanged