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PODependency Injection and Factories
 

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    <p>What is a decent way to handle conditional sub-factories with a DI approach. The scenario is the loader object that gets injected into an entry is dependent on the settings of that entry. Originally I was injecting the IoC container into the factory and using that to resolve based on naming conventions. However, I'd really like to keep the factory clean of the container.</p> <p>The factory is injected into a class that will load all the settings from a database, and then use the factory to create a set of entries. The settings determine which loader will be used inside that given entry.</p> <p>Edit: Changing code to better highlight the actual question. The issue is that multiple database managers must be supported simultaneously, if this were not the case then it would be simple. The database manager type is determined by the entry settings stored for a particular entry.</p> <pre><code>public class Entry : IEntry { private ISomething loader; public Entry(ISomething something) { this.loader = something; } } public class EntryFactory : IEntryFactory { IEntry BuildEntry(IEntrySetting setting) { //Use setting object to determine which database manager will be used } } public class EntryManager { public EntryManager(IEntryFactory entryFactory) { var entrySettings = this.settings.Load(); foreach(var setting in entrySettings) { this.entries.Add(entryFactory.BuildEntry(setting)); } } } </code></pre> <p>I had considered having the sub-factories register with a primary factory and resolve them that way, but I don't know if there is a better approach.</p>
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    1. COYou have a runtime input into the dependency resolution mechanism, so I doubt there's a way to achieve complete container independence here. So pushing it off into a factory seems to be the best you can do. You may also find [Autofac's relationship types](http://code.google.com/p/autofac/wiki/RelationshipTypes) interesting.
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    2. COAs I see you are doing work in your entry constructor and that's the problem why the whole DI and factory staff wont work. loader.Load(); Let constructor contain only field initialization. What does the load method do? Does it fills the entry object with data? In this case that's not a constructor job. The factory must put ready to use loaded data into entry, getting it from somewhere else.
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