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POASP.NET MVC posted file model binding when parameter is Model
 

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    <p>Is there any way to get posted files (<code>&lt;input type="file" /&gt;</code>) to take part in model binding in ASP.NET MVC <strong>without manually looking at the request context in a custom model binder, and without creating a separate action method which only takes a posted file as input?</strong></p> <p>I would have thought that this would work:</p> <pre><code>class MyModel { public HttpPostedFileBase MyFile { get; set; } public int? OtherProperty { get; set; } } &lt;form enctype="multipart/form-data"&gt; &lt;input type="file" name="MyFile" /&gt; &lt;input type="text" name="OtherProperty" /&gt; &lt;/form&gt; public ActionResult Create(MyModel myModel) { ... } </code></pre> <p>But given the above scenario, <strong><code>MyFile</code> isn't even part of the value provider values in the binding context.</strong> (<code>OtherProperty</code> is, of course.) But it works if I do this:</p> <pre><code>public ActionResult Create(HttpPostedFileBase postedFile, ...) { ... } </code></pre> <p>So, why does no binding occur when the parameter is a model, and how can I make it work? I have no problem with using a custom model binder, but how can I do this in a custom model binder without looking at <code>Request.Files["MyFile"]</code>? </p> <p>For consistency, clarity and testability, I'd like my code to provide automatic binding of all properties on a model, including those bound to posted files, without manually inspecting the request context. I am currently testing model binding using <a href="http://www.hanselman.com/blog/SplittingDateTimeUnitTestingASPNETMVCCustomModelBinders.aspx" rel="noreferrer">the approach Scott Hanselman wrote about</a>.</p> <p>Or am I going about this in the wrong way? How would you solve this? Or is this not possible by design due to the history of separation between Request.Form and Request.Files?</p>
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