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POTryUpdateModel throws NullReferenceException in ASP.NET MVC 3 unit test
 

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    <p>Since I upgraded from MVC 2 to MVC 3 RC, using TryUpdateModel causes a NullReferenceException. This problem only occurs when running my action method as part of a unit test. Running it on the actual server works as expected.</p> <p>Here's a stack trace of the exception:</p> <blockquote> <p>System.NullReferenceException: Object reference not set to an instance of an object. at System.Web.Mvc.JsonValueProviderFactory.GetValueProvider(ControllerContext controllerContext) at System.Web.Mvc.ValueProviderFactoryCollection.&lt;>c_<em>DisplayClassc.b</em>_7(ValueProviderFactory factory) at System.Linq.Enumerable.WhereSelectEnumerableIterator<code>2.MoveNext() at System.Linq.Enumerable.WhereSelectEnumerableIterator</code>2.MoveNext() at System.Collections.Generic.List<code>1..ctor(IEnumerable</code>1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source) at System.Web.Mvc.ValueProviderFactoryCollection.GetValueProvider(ControllerContext controllerContext) at System.Web.Mvc.Controller.TryUpdateModel[TModel](TModel model, String prefix)<br> ... my own code from here on....</p> </blockquote> <p>In case it matters, my controller has the following signature:</p> <pre><code>[AcceptVerbs(HttpVerbs.Post)] public virtual ActionResult Edit(int id, FormCollection collection) { } </code></pre> <p>My guess is that this has to do with the new way DI works in MVC3, but I can't figure out what I'm doing wrong. Perhaps there is something in terms of DI setup that is required in MVC 3, but wasn't required in MVC 2?</p>
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