<PackageReference Include="System.Collections.NonGeneric" Version="4.3.0" />
CollectionBase
public int Count {
get; }
protected virtual void OnInsert(
int index,
object value)
protected virtual void OnRemove(
int index,
object value)
protected virtual void OnSet(
int index,
object oldValue,
object newValue)
protected virtual void OnSetComplete(
int index,
object oldValue,
object newValue)