2009-05-25 Part 2: Dependency injection with Unity and XML configuration

2009-05-25 part-2-dependency-injection-with-unity-and-xml-configuration

# Title: Part 2: Dependency injection with Unity and XML configuration
# Author: Mikael Lundin
# Link: http://blog.mikaellundin.name/2009/05/25/part-2-dependency-injection-with-unity-and-xml-configuration.html

Unity.config.xml

<type type="RssDocument" mapTo="RssDocument" name="Movies">
  <typeConfig extensionType="Microsoft.Practices.Unity.Configuration.TypeInjectionElement,
                             Microsoft.Practices.Unity.Configuration">
    <constructor>
      <param name="version" parameterType="System.String">
        <value value="2.0" type="System.String" />
      </param>
      <param name="channelGenerators" parameterType="RssChannelGeneratorArray">
        <array>
          <dependency name="MovieList" />
        </array>
      </param>
    </constructor>
  </typeConfig>
</type>

Unity2.config.xml

<type type="RssChannelGenerator" mapTo="Kino.Lib.Rss.RssDirectoryGenerator, Kino.Lib" name="MovieList">
  <typeConfig extensionType="Microsoft.Practices.Unity.Configuration.TypeInjectionElement,
                             Microsoft.Practices.Unity.Configuration">
    <constructor>
      <param name="title" parameterType="System.String">
        <value value="Movies" type="System.String" />
      </param>
      <param name="link" parameterType="System.String">
        <value value="http://mint.litemedia.se" type="System.String" />
      </param>
      <param name="description" parameterType="System.String">
        <value value="Sharing of movies" type="System.String" />
      </param>
      <param name="documentation" parameterType="System.String">
        <value value="http://blogs.law.harvard.edu/tech/rss" type="System.String" />
      </param>
      <param name="managingEditor" parameterType="System.String">
        <value value="[email protected]" type="System.String" />
      </param>
      <param name="webMaster" parameterType="System.String">
        <value value="[email protected]" type="System.String" />
      </param>
      <param name="basePath" parameterType="System.String">
        <value value="C:\Movies" type="System.String" />
      </param>
      <param name="searchPattern" parameterType="SearchPatterns">
        <array>
          <value value="*.wmv" type="System.String" />
          <value value="*.avi" type="System.String" />
          <value value="*.mpg" type="System.String" />
        </array>
      </param>
    </constructor>
  </typeConfig>
</type>

UnityContainer.cs

public UnityContainer GetContainer(string name)
{
    if (configurationSection == null)
        throw new InvalidOperationException("No unity configuration was found, could not instansiate container");
 
    var container = new UnityContainer();
 
    UnityContainerElement containerConfiguration = configurationSection.Containers[name];
    if (containerConfiguration == null)
        throw new ConfigurationErrorsException("No unity configuration for " + name + " was found");
 
    containerConfiguration.Configure(container);
    return container;
}

Web.config.xml

<configuration>
  <configSections>
    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration, Version=1.2.0.0" />
  </configSections>
  <unity configSource="Unity.config" />
</configuration>