For the ProductsBLL class we need to add a total of seven methods.

在ProductsBLL类中，我们一共需要为其添加7个方法。

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Remember that you need to add the necessary inherited abstract methods for your class.

请记住，您需要为类添加必要的继承抽象方法。

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Remember that you need to add the necessary inherited abstract methods for your class.

请记住，您需要为类添加必要的继承抽象方法。

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