コード例 #1
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 private static bool HasNotFoundQuantity(OrderForm form) => form.Count == 0;
コード例 #2
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 private static bool HasNotFoundDate(OrderForm form) => form.DeliveryDate == null;
コード例 #3
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 private static bool HasNotFoundFoodItem(OrderForm form) => string.IsNullOrEmpty(form.Item);