'宣言 Public ReadOnly Property HistoryItem As ViewHistoryItem
'使用法 Dim instance As HistoryItemAddingEventArgs Dim value As ViewHistoryItem value = instance.HistoryItem
public ViewHistoryItem HistoryItem {get;}
'宣言 Public ReadOnly Property HistoryItem As ViewHistoryItem
'使用法 Dim instance As HistoryItemAddingEventArgs Dim value As ViewHistoryItem value = instance.HistoryItem
public ViewHistoryItem HistoryItem {get;}