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因此，我了解 IoC，尤其是在“将未知的混凝土注入”到课程中时。在构造函数中或通过属性将“ILogger”注入类的最通用示例。

现在，我有一个较旧的工厂模式，我试图弄清楚如何/是否可以转换为 IoC。（我正在使用 Unity，仅供参考）。

下面我有我的旧工厂模式。它基本上是根据当前的天然气（石油）价格做出工厂决定。如果汽油真的很贵，我会骑自行车。如果汽油价格中等，我会开车。如果汽油变得便宜，那我开卡车上班！（这是一个愚蠢的例子，请随它去吧）。

我不明白的是我如何将其“翻译”为 IoC ......当涉及到返回哪个具体类的业务逻辑决策时。

我错过了什么？也许我还需要工厂？还是我错过了一些关键概念？

在此先感谢您的帮助...

namespace MyApp
{
    public interface IVehicle
    {
        void MakeTrip();
    }

    public class Bicycle : IVehicle
    {
        public void MakeTrip() { Console.WriteLine("Bicycles are good when gas is expensive."); }
    }

    public class Car : IVehicle
    {
        public void MakeTrip() { Console.WriteLine("Cars are good when gas is medium priced"); }
    }

    public class PickupTruck : IVehicle
    {
        public void MakeTrip() { Console.WriteLine("Gas is back to 1980's prices.  Drive the truck!"); }
    }


    public static class VehicleFactory
    {

        public static IVehicle GetAConcreteVehicle(decimal priceOfGasPerGallon)
        {
            if (priceOfGasPerGallon > 4.00M)
            {
                return new Bicycle();
            }

            if (priceOfGasPerGallon > 2.00M)
            {
                return new Car();
            }

            return new PickupTruck();
        }
    }



public class TripControllerOldFactoryVersion
{
    public decimal PriceOfGasPerGallon { get; set; }

    public TripControllerOldFactoryVersion(decimal priceOfGas)
    {
        this.PriceOfGasPerGallon = priceOfGas;
    }
    public void TakeATrip()
    {
        IVehicle v = VehicleFactory.GetAConcreteVehicle(this.PriceOfGasPerGallon);
        v.MakeTrip();
    }
}

}




    class Program
    {
        static void Main(string[] args)
        {

            try
            {
                TripControllerOldFactoryVersion controller1 = new TripControllerOldFactoryVersion(5.00M);
                controller1.TakeATrip();

                TripControllerOldFactoryVersion controller2 = new TripControllerOldFactoryVersion(3.33M);
                controller2.TakeATrip();

                TripControllerOldFactoryVersion controller3 = new TripControllerOldFactoryVersion(0.99M);
                controller3.TakeATrip();

            }
            catch (Exception ex)
            {

                Exception exc = ex;
                while (null != exc)
                {
                    Console.WriteLine(exc.Message);
                    exc = exc.InnerException;
                }
            }
            finally
            {
                Console.WriteLine("Press ENTER to Exit");
                Console.ReadLine();
            }

        }
}

所以上面是工厂版本。

因此，我试图找出将其转换为 IoC 的最佳方法，但仍有一些“基于天然气价格”的逻辑来确定 IVehicle。

启动代码如下。

public class TripControllerIoCVersion
{
    public IVehicle TheVehicle { get; set; }

    public TripControllerIoCVersion(IVehicle v)
    {
        this.TheVehicle = v;
    }
    public void TakeATrip()
    {
        if (null != this.TheVehicle)
        {
            this.TheVehicle.MakeTrip();
        }
    }
}
4

1 回答 1

1

出色地。我想通了一些东西。我仍然需要考虑。我不喜欢硬编码的“关键”名称。但它确实有效。

仍然需要上面的代码，但我将“工厂”更改为下面的代码。

一是统一配置。

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration"/>
  </configSections>

  <unity>
    <container>

      <register type="MyProjectName.IVehicle, MyProjectName" mapTo="MyProjectName.Bicycle, MyProjectName" name="myBicycleKey" />
      <register type="MyProjectName.IVehicle, MyProjectName" mapTo="MyProjectName.Car, MyProjectName" name="myCarKey" />
      <register type="MyProjectName.IVehicle, MyProjectName" mapTo="MyProjectName.PickupTruck, MyProjectName" name="myPickupTruckKey" />

    </container>
  </unity>

</configuration>

现在是cs代码。

public static class VehicleFactory
{

    public static IVehicle GetAConcreteVehicle(decimal priceOfGasPerGallon)
    {

        var container = new UnityContainer();

        UnityConfigurationSection section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
        section.Configure(container);

        IVehicle v = null;

        if (priceOfGasPerGallon > 4.00M)
        {
            v = container.Resolve<IVehicle>("myBicycleKey");
            return v;
        }

        if (priceOfGasPerGallon > 2.00M)
        {
            v = container.Resolve<IVehicle>("myCarKey");
            return v;
        }

        v = container.Resolve<IVehicle>("myPickupTruckKey");
        return v;

    }
}

我想我从这里得到了这个想法：

http://www.sharpfellows.com/post/Unity-IoC-Container-.aspx

于 2013-02-05T22:01:22.463 回答