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POInject different repository depending on a querystring / derive controller and inject the repository depending on the controller type / ASP.NET MVC
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  1. POInject different repository depending on a querystring / derive controller and inject the repository depending on the controller type / ASP.NET MVC
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    copied!<p>I have a search form that can search in different provider. I started out by having a base controller</p> <pre><code>public SearchController : Controller { protected readonly ISearchService _searchService public SearchController(ISearchService searchService) { _searchService= searchService; } public ActionResult Search(...) { // Use searchService to query and return a view. } } </code></pre> <p>And child controllers </p> <pre><code>TwitterController : SearchController { ... } NewsController : SearchController { ... } </code></pre> <p>I use StructureMap to insert all my dependencies in the controller. With this setup, I was able to change the SearchService depending on the type of the controller being instanciated.</p> <pre><code>x.For&lt;ISearchService&gt;().ConditionallyUse(o =&gt; { o.TheDefault.Is.OfConcreteType&lt;NewsSearchService&gt;(); o.If(c =&gt; c.ParentType == typeof(TwitterController)) .ThenIt.Is.OfConcreteType&lt;TwitterSearchService&gt;(); ... }); </code></pre> <p>That even allowed me to set different Views for each controller, (just putting the corresponding folder (Twitter, News...) and the Parent controller is still handling all the Search, with a simple </p> <pre><code>return View(results) </code></pre> <p>which is displaying the correct view specific to twitter, news, or other</p> <p>Now that was cool and looked great, I a single form and the different views are displayed in tabs on the same page. That's where it starts to get complicated with this approach. The form has to post to /Twitter to search in twitter, to /News to search in news... which means I should change the action parameter of the form depending on which tab I am and display the correct tab on when the form returns depending on.. the url? craziness follows.</p> <p>If you have built something like this already or know what's the best approach to this, please advices are welcome.</p> <p>Now I think I would have less pain using a parameter in the form and posting to a single controller. I am thinking of injecting the correct SearchService depending on this parameter. What would be the best approach? I thought of using a model binder,</p> <p>So I would have my ActionMethod that look like this:</p> <pre><code>public ActionResult Search(ISearchService service, Query query) { var results = service.Find(query); } </code></pre> <p>But I think would need to make a call like this in the ModelBinder</p> <pre><code>ObjectFactory.GetInstance(...); </code></pre> <p>Based on the querystring parameter that describe which provider to use, and that doesn't seem more elegant to me. I feel stuck, help :(.</p>
 

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