'宣言 Public ReadOnly Property Area As System.Collections.ObjectModel.ObservableCollection(Of Quadrilateral)
public System.Collections.ObjectModel.ObservableCollection<Quadrilateral> Area {get;}
'宣言 Public ReadOnly Property Area As System.Collections.ObjectModel.ObservableCollection(Of Quadrilateral)
public System.Collections.ObjectModel.ObservableCollection<Quadrilateral> Area {get;}