Represents a generic collection of key/value pairs that provides notifications when items get added, removed, changed or when the whole list is refreshed.
'宣言
Public Class ObservableDictionary
(Of TKey,TValue)
Inherits System.Collections.ObjectModel.ObservableCollection(Of ObservableKeyValuePair(Of TKey,TValue))
public class ObservableDictionary<TKey,TValue> : System.Collections.ObjectModel.ObservableCollection<ObservableKeyValuePair<TKey,TValue>>