Question

我有第三方图书馆返回班级实例。它不在我的cotrol中，但我想用Unity来影响它的公共属性。由于我不能将DependecyAttribute添加到其属性中，因为该类不是部分的，也不是继承的，我想知道是否可以使用Unity XML配置来执行操作。

是否可以使用Unity's XML配置来配置构建依赖项？如果答案是肯定的。如何配置XML来做到这一点？

我试过了：

<register type="IService" mapTo="Service"> <!--Service has public constructor-->
</register>

<!--ThirdPartyObj has no interface and no public constructor-->
<register type="ThirdPartyObj " mapTo="ThirdPartyObj">
    <!-- Inject the property "Service" -->
    <property name="Service" /> //type of the property is IService
</register>

如果Unity Resolve ThidPartyObj购买不在BuilUp中工作（服务属性中为空引用）且不能Resolve ThirdPartyObj，则此配置将有效公共建设者。

我想要成就的简单例子：

IUnityContainer uc = New UnityContainer() //create container
container.LoadConfiguration() // load from XML config
ThirdPartyObj foo = ThirdPartyLibrary.getFooInstace() //get third party instance
container.BuildUp(foo.getType, foo) //inyect dependencies
Console.WriteLine(foo.Service.getServiceMessage)

Answer 1

为Unity创建一个包装友好的包装器：

public interface IThirdpartyWrapper
{
   ThirdpartyObj ConfiguredObject{get;}
}
public class ThirdpartyWrapper:IThirdpartyWrapper
{
    private ThirdpartyObject _thirdPartyObject;
     public ThirdpartyWrapper(IService myService)
    {
         _thirdPartyObject=ThirdPartyLibrary.getFooInstance();
         _thirdPartyObject.Service=myService;
    }
     public ThirdpartyObj ConfiguredObject
    {
      get{return _thirdPartyObject;}
    }

}

现在我们有一个Unity友好的课程来玩

Unity Xml配置：

<register type="IService" mapTo="Service"> <!--Service has public constructor-->
</register>

<!--ThirdPartyObj has no interface and no public constructor-->
<register type="IThirdpartyWrapper" mapTo="IThirdpartyWrapper">
</register>

当我执行以下操作时：

var wrapper=_container.Resolve<IThirdpartyWrapper>();
var configuredObject=wrapper.ConfiguredObject;

包装器实例化第三方对象的副本，然后将服务注入相应的属性（或者可以通过方法调用等传入）。

这不会占用太多代码，可以进行单元测试并满足您的需求。

Answer 2

根据您发布的代码，应该没有问题。

我创建了两个项目：一个控制台应用程序和一个名为ThirdPartyLibrary的类库。

ThirdPartyLibrary包含以下内容（根据发布的代码推断）：

namespace ThirdPartyLibrary
{
    public interface IService
    {
        string GetServiceMessage { get; }
    }

    public class Service : IService
    {
        public Service() { }

        public string GetServiceMessage
        {
            get { return "The message!"; }
        }
    }

    public static class ThirdPartyLibrary
    {
        public static ThirdPartyObj GetFooInstance()
        {
            return new ThirdPartyObj();
        }
    }

    public interface IThirdPartyObj { }
    public class ThirdPartyObj : IThirdPartyObj
    {
        internal ThirdPartyObj() { }
        public IService Service { get; set; }
    }
}

XML配置如下所示：

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

  <unity xmlns="http://schemas.microsoft.com/practices/2010/unity">

    <container>
      <register type="ThirdPartyLibrary.IService, ThirdPartyLibrary" mapTo="ThirdPartyLibrary.Service, ThirdPartyLibrary">
      </register>

      <register type="ThirdPartyLibrary.IThirdPartyObj, ThirdPartyLibrary" mapTo="ThirdPartyLibrary.ThirdPartyObj, ThirdPartyLibrary">
        <!-- Inject the property "Service" -->
        <property name="Service" />
      </register>
    </container>

  </unity>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
  </startup>
</configuration>

控制台应用程序是：

class Program
{
    static void Main(string[] args)
    {
        IUnityContainer container = new UnityContainer(); //create container
        container.LoadConfiguration(); // load from XML config
        ThirdPartyObj foo = ThirdPartyLibrary.ThirdPartyLibrary.GetFooInstance(); //get third party instance
        container.BuildUp(foo.GetType(), foo); //inyect dependencies
        Console.WriteLine(foo.Service.GetServiceMessage);
    }
}

此工作正常，并按预期输出The message!。也许，确切的情况与您发布的（我假设是虚构的）示例或其他未正确配置的情况不同？

没有DependencyAttribute的Unity BuildUp

2 个答案: