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POAbstracting the interpretation of MVC checkboxes values received by the FormsCollection object
 

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    <p>In ASP.NET MVC a checkbox is generated by the HtmlHelper code here:</p> <pre><code>&lt;%= Html.CheckBox("List_" + mailingList.Key, true) %&gt; </code></pre> <p>as this HTML:</p> <pre><code>&lt;input id="List_NEW_PRODUCTS" name="List_NEW_PRODUCTS" type="checkbox" value="true" /&gt; &lt;input name="List_NEW_PRODUCTS" type="hidden" value="false" /&gt; </code></pre> <p>In case you're wondering why is there an extra hidden field? - then <a href="https://stackoverflow.com/questions/220020#479220">read this</a>. Its definitely a solution that makes you first think 'hmmmmm' but then you realize its a pretty elegant one.</p> <p>The problem I have is when I'm trying to parse the data on the backend. Well its not so much of a problem as a concern if anything in future were to change in the framework.</p> <p>If I'm using the built in binding everything is great - its all done for me. But in my case I'm dynamically generating checkboxes with unknown names and no corresponding properties in my model.</p> <p>So i end up having to write code like this :</p> <pre><code>if (forms["List_RETAIL_NOTIFICATION"] == "true,false") { } </code></pre> <p>or this: </p> <pre><code>if (forms.GetValues("List_RETAIL_NOTIFICATION")[0] == "true") { } </code></pre> <p>Both of which i still look at and cringe - especially since theres no guarantee this will always be the return value. I'm wondering if theres a way to access the layer of abstraction used by the model binders - or if I'm stuck with my controller 'knowing' this much about HTTP POST hacks. </p> <p>Yes I'm maybe being a little picky - but perhaps theres a better clever way using the model binders that I can employ to read dynamically created checkbox parameters. </p> <p>In addition i was hoping this this post might help others searcheing for : "true,false". Even though I knew why it does this I just forgot and it took me a little while to realize 'duh'.</p> <p><hr> FYI: I tried another few things, and this is what I found :</p> <p><code>forms["List_RETAIL_NOTIFICATION"]</code> evaluates to "true,false" <code>forms.GetValues("List_RETAIL_NOTIFICATION")[0]</code> evaluates to "true" <code>(forms.GetValue("List_RETAIL_NOTIFICATION").RawValue as string[])[0]</code> evaluates to "true" <code>forms.GetValues("List_RETAIL_NOTIFICATION").FirstOrDefault()</code> evaluates to "true"</p>
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