统一2.0：如何使用解决与ResolverOverride？ [英] Unity 2.0: How to use Resolve with ResolverOverride?

问题描述

我开始做与统一越来越多的工作。我注意到解析方法需要的 PARAMS 的参数的 ResolverOverride 的。

I started doing more and more work with Unity. I notice that Resolver method takes a params argument ResolverOverride.

有人可以给我一个例子，说明我可以使用的 ResolverOverride 的或点我在哪里可以得到更多的线索其他来源。

Can someone give me an example how I can use ResolverOverride or point me some other source where I can get more clues.

推荐答案

正如您已经注意到，这是一个新的（真的很酷的功能）此功能让你

As you have noticed this is a new (and realy cool feature) of the Unity 2. This feature let you

• 参数传递给在当下构造函数时您解决这个类。在统一1，你可以在那一刻，当你通过注册新InjectionConstructor类型只设定一个值（...）

有 ParameterOverride：ResolverOverride

一个ResolverOverride类，可以让你   覆盖传递给命名参数   构造函数。

A ResolverOverride class that lets you override a named parameter passed to a constructor.

• 在相同的依赖关系 DependencyOverride：ResolverOverride

这将覆盖值A级   注入每当有   依赖给定类型的，   不论在何地出现在中   对象图。

A class that overrides the value injected whenever there is a dependency of the given type, regardless of where it appears in the object graph.

• 在相同的性能与 PropertyOverride：ResolverOverride

一个ResolverOverride，让你重写值的指定属性。

A ResolverOverride that lets you override the value for a specified property.

示例

using System;
using Microsoft.Practices.Unity;

namespace ConsoleApplication1 {
    class Program {
        static void Main(string[] args) {

            var container = new UnityContainer();

            //ParameterOverride example

            container.RegisterType<IConcreteService, ConcreteService>(
                new InjectionConstructor(7) //Old way to pass value to constructor - not flexible. 
                                            //All resolved (without ovverride wich aapears only in unity 2.0) classes will hav val=7
                );

            var service0 = container.Resolve<IConcreteService>();
            Console.WriteLine(service0.Val); //prints 7

            var service = container.Resolve<IConcreteService>(new ParameterOverride("val", 3));
            Console.WriteLine(service.Val); // prints 3

            var service2 = container.Resolve<IConcreteService>(new ParameterOverride("val", 5));
            Console.WriteLine(service2.Val); // prints 5

            Console.ReadLine();

            //DependencyOverride example

            var b0 = container.Resolve<B>(new DependencyOverride<IConcreteService>(new ConcreteService(42)));
            Console.WriteLine(b0.Service.Val); //print 42
            Console.WriteLine(b0.Service1.Val); //print 42

            var b = container.Resolve<B>(new DependencyOverride<IConcreteService>(new ConcreteService(-42)));
            Console.WriteLine(b.Service.Val); // print -42
            Console.WriteLine(b.Service1.Val); // print -42

            Console.ReadLine();

            //PropertyOverride example 

            var b1 = container.Resolve<B>(new PropertyOverride("Service", new ConcreteService(42)), 
                new PropertyOverride("Service1", new ConcreteService(-42)));
            Console.WriteLine(b1.Service.Val); //print 42
            Console.WriteLine(b1.Service1.Val); //print -42

            Console.ReadLine();



        }
    }

    public interface IConcreteService {
        int Val { get; set; }
    }
    public class ConcreteService : IConcreteService {

        public int Val { get; set; }

        public ConcreteService(int val) {
            Val = val;
        }
    }

    public class B {
        [Dependency]
        public IConcreteService Service{ get; set; }

        [Dependency]
        public IConcreteService Service1 { get; set; }

    }
}

不知道为什么谷歌一直对沉默。

Have no idea why does google keeps silence about that.

行情是从Unity源$ C ​​$ C XML文档。

Quotes are from Unity source code xml docs.

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