C# 反射在工厂设计模式中的应用
利用设计模式可以使我们的代码更灵活,更容易扩展,更容易维护。各种面向对象的程序设计语言都提供了基本相同的机制:比如类、继承、派生、多态等等。但是又有各自的特色,c# 中的反射机制便是一个很重要的工具,好好地利用就可以在实际中发挥很大的作用。
例子:
using System;
namespace Factory
{
public interface IFruit
{
}
public class Orange : IFruit
{
public Orange()
{
Console.WriteLine("An orange is got!");
}
}
public class Apple : IFruit
{
public Apple()
{
Console.WriteLine("An apple is got!");
}
}
public class FruitFactory
{
private static FruitFactory _instance = new FruitFactory();
public static FruitFactory Instance
{
get { return _instance; }
}
public IFruit MakeFruit(string Name)
{
IFruit MyFruit = null;
try
{
Type type = Type.GetType(Name, true);
MyFruit = (IFruit)Activator.CreateInstance(type);
}
catch (TypeLoadException e)
{
Console.WriteLine("I dont know this kind of fruit,exception caught - {0}", e.Message);
}
return MyFruit;
}
}
public class Test
{
static void Main()
{
string FruitName = Console.ReadLine();
FruitFactory.Instance.MakeFruit("Factory." + FruitName);
}
}
}
运行:
输入: Apple 查看结果
例子:
using System;
namespace Factory
{
public interface IFruit
{
}
public class Orange : IFruit
{
public Orange()
{
Console.WriteLine("An orange is got!");
}
}
public class Apple : IFruit
{
public Apple()
{
Console.WriteLine("An apple is got!");
}
}
public class FruitFactory
{
private static FruitFactory _instance = new FruitFactory();
public static FruitFactory Instance
{
get { return _instance; }
}
public IFruit MakeFruit(string Name)
{
IFruit MyFruit = null;
try
{
Type type = Type.GetType(Name, true);
MyFruit = (IFruit)Activator.CreateInstance(type);
}
catch (TypeLoadException e)
{
Console.WriteLine("I dont know this kind of fruit,exception caught - {0}", e.Message);
}
return MyFruit;
}
}
public class Test
{
static void Main()
{
string FruitName = Console.ReadLine();
FruitFactory.Instance.MakeFruit("Factory." + FruitName);
}
}
}
运行:
输入: Apple 查看结果