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POHow can I create a binding in Ninject that changes based on the requested controller?
 

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  1. POHow can I create a binding in Ninject that changes based on the requested controller?
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    <p>I have an ASP.NET MVC 3 app, and have run into the following situation. On my page, I have a side bar, which can contain related links specific to that page, i.e., determined by controller type. The links will be determined by the current page's content. </p> <p>I have followed <a href="http://haacked.com/archive/2009/11/18/aspnetmvc2-render-action.aspx" rel="nofollow">Phil Haack's blog post</a> on rendering dynamic side bars such as this using <code>Html.Action</code> and a separate controller. I like the separation of concerns this approach gives me: my controllers don't know anything about the side bar at all, which is the way it should be. </p> <p>I now want to inject an instance of a derived type of <code>SideBar</code> into my <code>SideBarController</code>, an action on which will be called to render the side bar itself. There is one derived type of <code>SideBar</code> per controller, and so I find myself wanting to write code similar to this:</p> <pre><code>kernel.Bind&lt;SideBar&gt;().ToMethod(_ =&gt; controllerName == "foo" ? new FooSideBar(kernel.Get&lt;UrlHelper&gt;()) : new BarSideBar(kernel.Get&lt;UrlHelper&gt;())); </code></pre> <p>but there's quite a lot that is wrong about that fragment of code, not least the fact that I can't get hold of the controller name in the lambda, and the question of what happens when a third type of controller comes along, and then a fourth, etc. </p> <p>Note that I can't use <code>WhenInjectedInto&lt;T&gt;()</code>, as the <code>SideBar</code> instance will always be injected into the <code>SideBarController</code>. </p> <p>For what it's worth, the instances of <code>SideBar</code> are currently being created via the Ninject Factory extension, so the relevant side bar bindings are as follows (I've hard-bound an implementation of SideBar just to prove the approach so far works):</p> <pre><code>kernel.Bind&lt;ISideBarFactory&gt;().ToFactory().InRequestScope(); kernel.Bind&lt;SideBar&gt;().To&lt;FooSideBar&gt;().InRequestScope(); </code></pre> <p>Finally, I essentially have a one-to-one mapping between the derived types of <code>SideBar</code> and the controller types. It feels a little bit like there might be a bit of duplication here, but also it represents the relationship between the components, so I think I'm ok with it. </p> <p>This all makes me think that my approach to this part of the problem is wrong, and so I would welcome suggestions on how to achieve a clean solution with Ninject. </p>
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    1. COI don't see how specifying my bindings in XML would help resolve the problem I described.
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    2. COYou are 100% correct. Sorry, I completely misread the question. I think in my haste I actually read what I wanted to read instead of what was actually written. I am deleting the comment so that it doesn't mislead anyone in the future.
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