// ログリスト初期化メソッド private ObservableCollection <OperationLog> GetLogs() { DatabaseAccess db = new DatabaseAccess(); var all_Logs = db.Get_AllOperation(); foreach (var log in all_Logs) { Logs.Add(log); } Logs = new ObservableCollection <OperationLog>(from i in Logs orderby i._date descending select i); return(Logs); }