ObservableCollection<T>.Clear() does not raise propertychanged event?

[maslewandowski]

when i execute the .Clear() method of a observablecollection (in my case ObservableCollection) it does not raise the propertychangedevent.

is this because of the datatype drawingline?

var drawingLineCollection = new ObservableCollection<IDrawingLine>();
//this raises the event:
drawingLineCollection = new ObservableCollection<IDrawingLine>();
//this not:
drawingLineCollection.Clear();

thanks for help.

[maslewandowski]

Solution:

ObservableCollection.Clear() does not raise propertychanged event.

If you want the popertychanged event to be raised, you need to
option 1:
create a new object and "overwrite" the existing variable value
var collection = new ObersvableCollection<IDrawingLine>();

option 2:
Call OnPropertyChanged manually
OnPropertyChanged(nameof(collection))

Just in case somebody is wondering.

greetings