C # design pattern series: simple factory)

1. Introduction to the simple factory Model

1.1>, definition

The simple factory mode defines a factory class, which can return instances of different classes according to different parameters. The created instances usually have a common parent class.

In simple factory mode, only one factory class is required.

The simple factory mode is also called the static factory mode. The factory class is a static class or contains a static method.

1.2>. Usage Frequency

Medium

2. Simple factory mode structure

2.1>, structure chart

 

2.2> participants

Participants in the simple factory model:

Abstract product: Abstract product class. It abstracts and extracts common code of a specific product class and encapsulates it in an abstract product class.

◊ Concreteproduct: A product class that encapsulates the code of various product objects to be created into a specific product class.

Factory: A factory class that provides a factory class for creating various products and a factory method for creating products in the factory class, this method can create different product Objects Based on different input parameters.

Consumer Client: client class. You only need to call the factory method of the factory class and input the corresponding parameters to obtain a product object.

3. Simple factory mode structure implementation