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PODI-Container: Howto pass configuration to objects
 

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    <p>Sometimes I have classes which need to get some information for construction. I am not talking about references to other objects (which will be injected) but about (for instance) strings which are holding unique information:</p> <pre><code>// Scoped as singleton! class Repository { public Repository( InjectedObject injectedObject, string path ) { ... } } </code></pre> <p>How do you get this string injected? One possiblity is to write an <code>Init()</code> method and to avoid injection for the string:</p> <pre><code>class Repository { public Repository( InjectedObject injectedObject ) { ... } public void Init( string path ) { ... } } </code></pre> <p>Another possibility is to wrap the information into an object, which can be injected:</p> <pre><code>class InjectedRepositoryPath { public InjectedRepositoryPath( string path ) { ... } public string Path { get; private set; } } class Repository { public Repository( InjectedObject injectedObject, InjectedRepositoryPath path ) { ... } } </code></pre> <p>This way I'd have to create an instance of <code>InjectedRepositoryPath</code> during the initialisation of my DI-Container and register this instance. But I need such an unique configuration object for every similar class.</p> <p>Of course I can resolve a <code>RepositryFactory</code> instead of the <code>Repository</code> object, so the factory would ask me for the path:</p> <pre><code>class RepositoryFactory { Repository Create( string path ) { ... } } </code></pre> <p>But again, this is one factory just for a singleton object ...<br> Or, finally, since the path will be extracted from a configuration file, I could skip passing around the string and read the config in my constructor (which is probably not as optimal, but possible):</p> <pre><code>class Repository { public Repository( InjectedObject injectedObject ) { // Read the path from app's config } } </code></pre> <p>What's your favorite method? For non-singleton classes you have to use imho the <code>Init()</code> or factory solution, but what about singleton-scoped objects?</p>
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