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POContextual / Conditional dependency injection with depth greater than 1 with Ninject?
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  1. POContextual / Conditional dependency injection with depth greater than 1 with Ninject?
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    copied!<p>I have a <code>IDataContext</code> interface implemented by a <code>InMemoryDataContext</code> and <code>MyApplicationDataContext</code>. This is consumed by all of my repositories which are defined as <code>BananaRepository : IBananaRepository</code> and take the data context in their constructor:</p> <pre><code>interface IDataContext {} class InMemoryDataContext : IDataContext {} class MyApplicationDataContext : IDataContext {} interface IBananaRepository {} class BananaRepository : IBananaRepository { public BananaRepository(IDataContext dataContext) {} } </code></pre> <p>So far my consumers of the interfaces and services are ASP.NET MVC controllers, synchronous commands and queries. NInject is configured in my Web project and <code>IDataContext</code> is bound to <code>MyApplicationDataContext</code> with <code>InRequestScope()</code>.</p> <pre><code> kernel.Bind&lt;IDataContext&gt;().To&lt;MyApplicationDataContext&gt;().InRequestScope(); kernel.Bind&lt;IBananaRepository&gt;().To&lt;BananaRepository&gt;(); </code></pre> <p>I have reached the point in the evolution of my project where I want to start adding asynchronous processing (commands, events+handlers, etc). The problem I am facing is that for those I need to get a transient <code>IDataContext</code> (new one each time) but the binding is already set-up for a <code>IDataContext</code> instance per request for my controllers.</p> <p>Consider this simple scenario, where my <code>DoSomethingAsyncCommand</code> will execute on a new thread:</p> <pre><code>class DoSomethingAsyncCommand : IAsyncCommand&lt;TArgs&gt; { public DoSomethingAsyncCommand(IBananaRepository repository) {} public bool Execute(TArgs args) {} } </code></pre> <p>I want when NInject instantiates a class implementations of <code>IAsyncCommand</code> the <code>IBananaRepository</code> (and all my other repositories) to be initialized with a new instance of <code>IDataContext</code> rather than the one for the web request to be reused (effectively I want for <code>IAsyncCommand</code> my <code>IDataContext</code> to be bound as <code>InTransientScope()</code>)</p> <p>How can I do that?</p> <p>P.S: I am using the CommonServiceLocator rather than the Ninject kernel directly to instantiate IAsyncCommand instances.</p>
 

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