CSharp: Simple Factory Pattern in donet core 3

 

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/// <summary>    /// 简单工厂模式 Simple Factory Pattern    /// geovindu,Geovin Du edit    /// 动物    /// </summary>    public interface IAnimal    {          /// <summary>        ///        /// </summary>        void AboutMe();    }      /// <summary>    /// 简单工厂模式 Simple Factory Pattern    /// geovindu,Geovin Du edit    /// </summary>    public class Dog : IAnimal    {          /// <summary>        ///        /// </summary>        public void AboutMe()        {            Console.WriteLine("狗说: 汪汪。我更喜欢吠叫.");        }    }      /// <summary>    /// 简单工厂模式 Simple Factory Pattern    /// geovindu,Geovin Du edit    /// </summary>    public class Tiger : IAnimal    {        public void AboutMe()        {            Console.WriteLine("老虎说:geovindu。我更喜欢打猎.");        }    }   /// <summary>    /// 简单工厂模式 Simple Factory Pattern    /// geovindu,Geovin Du edit    /// </summary>    public class SimpleFactory    {          /// <summary>        ///        /// </summary>        /// <returns></returns>        public IAnimal CreateAnimal()        {            try            {                IAnimal intendedAnimal = null;                Console.WriteLine("输入你的选择(0代表狗，1代表虎)");                string b1 = Console.ReadLine();                int input;                if (int.TryParse(b1, out input))                {                    Console.WriteLine("你有输入 {0} 数字", input);                    switch (input)                    {                        case 0:                            intendedAnimal = new Dog();                            break;                        case 1:                            intendedAnimal = new Tiger();                            break;                        default:                            Console.WriteLine("你已输出错，您必须输入0或1");                            break;                            //We'll throw a runtime exception for any other choices.                            // throw new ApplicationException(String.Format(" Unknown Animal cannot be instantiated."));                    }                }                return intendedAnimal;            }            catch(Exception ex)            {                Console.WriteLine(ex.Message);                return null;            }          }    }

　　

调用：

 

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//简单工厂模式            Console.WriteLine("*** 简单工厂模式  Simple Factory Pattern Demo.***\n");            IAnimal preferredType = null;            SimpleFactory simpleFactory = new SimpleFactory();            #region The code region that can vary based on users preference.            /*             * Since this part may vary,we're moving the             * part to CreateAnimal() in SimpleFactory class.             */            preferredType = simpleFactory.CreateAnimal();            #endregion              #region The codes that do not change frequently.            if (object.Equals(preferredType, null))            {                Console.WriteLine("没有选择正确的数字。");            }            else            {                  preferredType.AboutMe();            }                         #endregion              Console.ReadKey();

　　

输出：

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*** 简单工厂模式  Simple Factory Pattern Demo.***   输入你的选择(0代表狗，1代表虎) 1 你有输入 1 数字 老虎说:geovindu。我更喜欢打猎.