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POResolving dependencies with constructor injection and named mappings using attributes on the constructor parameter
 

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    <p>Let's suppose I have two different concrete classes that both implement the same interface:</p> <pre><code>public interface IDataSource{ Connection CreateConnection(); } public class DataSourceA: IDataSource { .... } public class DataSourceB: IDataSource { .... } </code></pre> <p>Now I want to register both of these with my unity container:</p> <pre><code>var container = new UnityContainer(); container.RegisterType&lt;IDataSource, DataSourceA&gt;("A"); container.RegisterType&lt;IDataSource, DataSourceB&gt;("B"); </code></pre> <p>I know that I can specify the mapping name when I resolve a dependency :</p> <pre><code>var myDataSource = conatiner.Resolve&lt;IDataSource&gt;("A"); </code></pre> <p>However, in my case, I won't be resolving the dependency myself. I am creating many different controllers and I will be using <code>UnityDependencyResolver</code> (from ASP.Net MCVC) to create all the controllers. Some of my controllers required DataSource A, some require DataSource B, and some require both. What I'd like to do is specify which one to use as an attribute on the constructor parameter, like this:</p> <pre><code>public class ReportController{ public ReportController([InjectionQualifier("A")] IDataSource dataSource) { ... } } </code></pre> <p>Is something like that possible? I come from the spring world in java and I would use an @Qualifier annotation in this case using that stack.</p>
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    1. COWhat you want is exactly possible. See here http://stackoverflow.com/questions/7046779/with-unity-how-do-i-inject-a-named-dependency-into-a-constructor
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