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POReturning different components in different scopes with Autofac
 

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  1. POReturning different components in different scopes with Autofac
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    <p>I have two scopes, one nested inside the other. When I resolve a particular service, I would like one component to be resolved in one root scope and a different one in the child scope. Is there an easy way of doing this?</p> <p>I have managed to get something working using a factory class that determines what the current scope is and then returning the appropriate instance:</p> <pre><code>IContainer BuildContainer() { var builder = new ContainerBuilder(); // ... builder.RegisterType&lt;FooInParentScope&gt;().AsSelf(); builder.RegisterType&lt;FooInChildScope&gt;().AsSelf(); builder.RegisterType&lt;FooFactory&gt;().AsImplementedInterfaces(); builder.Register&lt;IFoo&gt;(c =&gt; c.Resolve&lt;IFooFactory&gt;().GetFoo()).InstancePerLifetimeScope(); // ... } class FooFactory : IFooFactory { private readonly ILifetimeScope m_scope; public FooFactory(ILifetimeScope scope) { m_scope = scope; } public IFoo GetFoo() { if (m_scope.Tag == "ParentScope") return m_scope.Resolve&lt;FooInParentScope&gt;(); else return m_scope.Resolve&lt;FooInChildScope&gt;(); } } class FooInParentScope : IFoo { } class FooInChildScope : IFoo { } </code></pre> <p>There are a number of issues with this approach:</p> <ol> <li>I have to add an extra class (or 2 - not sure if the IFooFactory is really necessary)</li> <li>The code above does not cope with other scopes that are nested in ParentScope. I can fix this by casting the scope to <code>Autofac.Core.Lifetime.LifetimeScope</code> and examining the <code>ParentLifetimeScope</code> property, but that is probably not a particularly safe thing to do.</li> </ol>
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    1. USJohn Hall
    1. USJohn Hall
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      1. USAnton Kalcik
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