简单写的一个Factory Method, 利用反射简化工厂逻辑,在添加/删除产品后不需要更新工厂.
using System;
using System.Collections.Generic;
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namespace ConsoleApplication1
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{
class Program
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{
static void Main(string[] args)
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{
Light l;
l = LightFactory.Create("Bulb");
l.TurnOn();
l.TurnOff();
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l = LightFactory.Create("Tube");
l.TurnOn();
l.TurnOff();
}
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}
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public interface ILightCreator
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{
Light Create();
}
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public abstract class Light
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{
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public abstract string Name
{ get; }
public abstract void TurnOn();
public abstract void TurnOff();
}
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class BulbLight : Light, ILightCreator
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{
public override void TurnOn()
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{
Console.WriteLine("Bulb Light is turned on");
}
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public override void TurnOff()
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{
Console.WriteLine("Bulb Light is turned off");
}
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ILightCreator Members#region ILightCreator Members
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public Light Create()
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{
return new BulbLight();
}
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#endregion
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public override string Name
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{
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get
{ return "Bulb"; }
}
}
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class TubeLight : Light, ILightCreator
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{
public override void TurnOn()
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{
Console.WriteLine("Tube Light is turned on");
}
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public override void TurnOff()
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{
Console.WriteLine("Tube light is turned off");
}
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ILightCreator Members#region ILightCreator Members
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public Light Create()
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{
return new TubeLight();
}
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#endregion
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public override string Name
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{
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get
{ return "Tube"; }
}
}
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public class LightFactory
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{
public static Light Create(string lightType)
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{
if (ImplementedLightCreator.ContainsKey(lightType))
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{
ILightCreator creator = ImplementedLightCreator[lightType];
return creator.Create();
}
else
return new BulbLight();
}
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static Dictionary<string, ILightCreator> implementedLightCreator;
public static Dictionary<string, ILightCreator> ImplementedLightCreator
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{
get
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{
if (implementedLightCreator == null)
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{
implementedLightCreator = InitilizeCreator();
}
return implementedLightCreator;
}
}
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private static Dictionary<string, ILightCreator> InitilizeCreator()
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{
Dictionary<string, ILightCreator> creators = new Dictionary<string, ILightCreator>();
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Type basic = typeof(ILightCreator);
foreach (Type t in basic.Assembly.GetTypes())
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{
if (basic.IsAssignableFrom(t) && !t.IsAbstract)
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{
ILightCreator instance = (ILightCreator)(Activator.CreateInstance(t));
creators[(string)(t.GetProperty("Name").GetValue(instance, null))] = instance;
}
}
return creators;
}
}
}
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