簡單工廠模式

UML類圖:

代碼示例：

[csharp]
//基類  
public abstract class Animal 
{ 
    public string Name { get; set; } 
    public abstract void Run(); 
} 
//子類1  
public class Chicken : Animal 
{ 
    public override void Run() 
    { 
        Console.WriteLine("Chicken was running..."); 
    } 
} 
//子類2  
public class Dog : Animal 
{ 
    public override void Run() 
    { 
        Console.WriteLine("Dog was running..."); 
    } 
} 
//工廠類  
public class AnimalFactory 
{ 
    public Animal CreateAnimal(string animalType) 
    { 
        switch (animalType) //依靠字符串分類  
        { 
            case "chicken": 
                return new Chicken(); 
            case "dog": 
                return new Dog(); 
            default: 
                throw new Exception("Invalid param..."); 
        } 
    } 
} 

    //基類
    public abstract class Animal
    {
        public string Name { get; set; }
        public abstract void Run();
    }
    //子類1
    public class Chicken : Animal
    {
        public override void Run()
        {
            Console.WriteLine("Chicken was running...");
        }
    }
    //子類2
    public class Dog : Animal
    {
        public override void Run()
        {
            Console.WriteLine("Dog was running...");
        }
    }
    //工廠類
    public class AnimalFactory
    {
        public Animal CreateAnimal(string animalType)
        {
            switch (animalType) //依靠字符串分類
            {
                case "chicken":
                    return new Chicken();
                case "dog":
                    return new Dog();
                default:
                    throw new Exception("Invalid param...");
            }
        }
    }