Unity - Factory via XML

问题

I am using the Unity framework as IoC container.

My Config looks some like this:

<unity>
  <container>
    <register type="Namespace1.IFoo, FooAsm"
              mapTo="Namespace2.Bar, BarAsm">
    </register>
</conainer>

I would like to register a container to use a factory method. How do i achive it using the app.config?

I am looking for something like this:

<unity>
  <container>
    <register type="Namespace1.IFoo, FooAsm"
              factory="Namespace2.Bar, BarAsm"
              method="create">
    </register>
  </conainer>
</unity>

Any suggestsions?

回答1:

This thread offers a nice response about how to add support of Factory methods for Unity. I fact you have to download this bitbucket source (and change the references to 4.0 framework).
If you now add Generic support for Unity you get a pretty awesome solution that might look like this:

<?xml version="1.0"?>
<configuration>
  <configSections>
    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection,Microsoft.Practices.Unity.Configuration"/>
  </configSections>
  <unity xmlns="schemas.microsoft.com/practices/2010/unity">
    <sectionExtension type="Unity.FactoryConfig.FactoryConfigExtension, Unity.FactoryConfig"/>
    <alias alias="Factory" type="Namespace1.GenericFactory`1, asm1"/>
    <container>
      <register type="Namespace1.ITest, asm1">
        <factory type="Factory[[Namespace1.ITest, asm1]]" method="Create" />
      </register>
    </container>
  </unity>
</configuration>

Support of generic Factories for unity framework using xml configuration!
Thanks for all comments :)

回答2:

I don't think there is a built-in way to do this currently. I usually just register the factory itself (Map IMyFactory -to-> MyFactoryImpl) then inject the factory into the classes that need it, and have the classes call the factory.

However, I think you can probably make something call a factory straight from Unity by making an extension for Unity. There are a couple mentioned in the answers to this question: How to create objects using a static factory method?

来源：https://stackoverflow.com/questions/9943216/unity-factory-via-xml