深入c#工厂模式的详解

public class Customer
{
    public void CallSomeOne(){
        PhoneA p1 = new PhoneA();
        p1.Call();
    }
}
public class PhoneA
{
    public void Call(){}
}
public class PhoneB
{
    public void Call(){}
}

using System;
namespace Example1
{
    public interface IProduct { }
    public class PhoneA : IProduct { }
    public class PhoneB : IProduct { }
    public class Factory
    {
        public IProduct Create()
        {
            // 工厂决定到底实例化哪个子类。
            return new PhonetA ();
        }
    }
}
using System;
namespace Example1
{
    public enum Category
    {
        A,

    }
    public static class ProductFactory
    {
        public static IProduct Create(Category category)
        {
            switch (category)
            {
                case Category.A:
                    return new PhoneA();
                case Category.B:
                    return new PhoneB();
                default:
                    throw new NotSupportedException();
            }
        }
    }
}

[TestMethod]
        public void Test()
        {
            Factory factory = new Factory();
            IProduct phone = factory.Create();   
            Assert.AreEqual<Type>(phone.GetType(), typeof(PhoneA));
        }

namespace Example2
{
    /// <summary>
    /// 抽象的工厂类型特性描述
    /// </summary>
    public interface IFactory
    {
        IProduct Create();  //  每个工厂所需要具有的工厂方法――创建产品
    }
    /// <summary>
    /// 实体工厂类型
    /// </summary>
    public class FactoryA : IFactory
    {
        public IProduct Create()
        {
            return new PhoneA();
        }
    }
    /// <summary>
    /// 实体工厂类型
    /// </summary>
    public class FactoryB : IFactory
    {
        public IProduct Create()
        {
            return new PhoneB();
        }
    }
}
using System;
using System.Diagnostics;
namespace Example2
{
    class Client
    {
        public void SomeMethod()
        {
            IFactory factory = new FactoryA();   // 获得了抽象Factory的同时，与FactoryA产生依赖；
            IProduct Phone = factory.Create(); // 后续操作仅以来抽象的IFactory和IProduct完成
            // ...
        }
        private IFactory factory;
        public Client(IFactory factory)     // 将IFactory通过Setter方式注入
        {
            if (factory == null) throw new ArgumentNullException("factory");
            this.factory = factory;
        }
        public void AnotherMethod()
        {
            IProduct Phone = factory.Create();
            // ... ...
        }
    }
}