Simple factory, simple factory Model

Simple factory, simple factory Model

: Simple factories are used to produce "things", and any sub-classes of "things", such as automobiles, bicycles, ships, and shampoos, can be produced, however, the pressure on a simple factory is too high. Any subclass of "things" can be produced, and the burden is too heavy. Therefore, simple factory classes are also called, it is called "God class".
The factory method model reduces the burden on the factory class, and submits a class/class to a factory for production, while adding a class of "stuff" does not need to be modified, you only need to add a factory that produces such "things", so that the factory class complies with the open-closed principle.

# Region simple factory public abstract class product {public abstract string display ();} public class Product 1: Product {public override string display () {return "model: Product 1. ";}} Public class Product 2: Product {public override string display () {return" model: product 2. ";}} Public enum product type {1 = 0, 2} public class simple factory {public static product creation (product type) {product template = null; switch (type) {case product type. i. template = new Product 1 (); break; case product type. ii. template = new product 2 (); break; default: break;} return template; }}# endregion