static public Expression <Func <int, int> > GetOrderByData(ItemDateKey itemDateKey) { return((item) => DateFile.instance.GetItemDateValue(item, itemDateKey)); }
public static int GetItemDateValue(this DateFile df, int itemId, ItemDateKey itemDateKey) => GetItemDateValue(df, itemId, (int)itemDateKey);
static public Expression <Func <int, bool> > GetHasDataFilter(ItemDateKey itemDateKey) { return((item) => DateFile.instance.GetItemDateValue(item, itemDateKey) > 0); }