Unity IOC容器的构造函数使用笔记（不能错过的Unity示例）

示例一，正常使用：

相关定义：

public interface ICar {     int Run(); }  public class BMW : ICar {     private int _miles = 0;      public int Run()     {         return ++_miles;     } }  public class Ford : ICar {     private int _miles = 0;     public int Run()     {         return ++_miles;     } }  public class Audi : ICar {     private int _miles = 0;      public int Run()     {         return ++_miles;     }  } public class Driver {     private ICar _car = null;      public Driver(ICar car)     {         _car = car;     }      public void RunCar()     {         Console.WriteLine("Running {0} - {1} mile ", _car.GetType().Name, _car.Run());     } }

使用：

var container = new UnityContainer(); container.RegisterType<ICar, BMW>();  var driver = container.Resolve<Driver>(); driver.RunCar();

我们使用Resolve来解析我们想要的调用对象，在这里是Driver。

示例二，多个注入：

相关定义的代码不变，将使用部分的代码改为：

var container = new UnityContainer(); container.RegisterType<ICar, BMW>(); container.RegisterType<ICar, Audi>("LuxuryCar");  // Register Driver type             container.RegisterType<Driver>("LuxuryCarDriver",                  new InjectionConstructor(container.Resolve<ICar>("LuxuryCar")));  Driver driver1 = container.Resolve<Driver>();// injects BMW driver1.RunCar();  Driver driver2 = container.Resolve<Driver>("LuxuryCarDriver");// injects Audi driver2.RunCar();

示例三，多个构造函数参数：

相关定义：

public interface ICarKey {           }  public class BMWKey : ICarKey  {  }  public class AudiKey : ICarKey  {  }  public class FordKey : ICarKey  {  }  public class Driver {     private ICar _car = null;     private ICarKey _key = null;      public Driver(ICar car, ICarKey key)      {         _car = car;         _key = key;     }      public void RunCar()     {         Console.WriteLine("Running {0} with {1} - {2} mile ", _car.GetType().Name , _key.GetType().Name,  _car.Run());     } }

相关使用：

var container = new UnityContainer();              container.RegisterType<ICar, Audi>(); container.RegisterType<ICarKey, AudiKey>();  var driver = container.Resolve<Driver>(); driver.RunCar();

示例四，多个构造函数：

相关定义不变，将使用部分代码改为：

public class Driver {     private ICar _car = null;             [InjectionConstructor]     public Driver(ICar car)     {         _car = car;     }          public Driver(string name)     {     }          public void RunCar()     {         Console.WriteLine("Running {0} - {1} mile ", _car.GetType().Name, _car.Run());     } }

container.RegisterType<Driver>(new InjectionConstructor(new Ford()));  //or   container.RegisterType<ICar, Ford>(); container.RegisterType<Driver>(new InjectionConstructor(container.Resolve<ICar>()));

示例五，基类型作为构造函数参数：

相关定义：

public class Driver {     private ICar _car = null;     private string _name = string.Empty;      public Driver(ICar car, string driverName)     {         _car = car;         _name = driverName;     }      public void RunCar()     {         Console.WriteLine("{0} is running {1} - {2} mile ",                          _name, _car.GetType().Name, _car.Run());     } } 

相关使用：

var container = new UnityContainer();              container.RegisterType<Driver>(new InjectionConstructor(new object[] { new Audi(), "Steve" }));  var driver = container.Resolve<Driver>(); // Injects Audi and Steve driver.RunCar();

完整请参考：

http://www.tutorialsteacher.com/ioc/constructor-injection-using-unity-container

文章来源: Unity IOC容器的构造函数使用笔记（不能错过的Unity示例）