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POAttempted to read or write protected memory
 

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    <p>I have a sample ASP.NET MVC 3 web application that is following Jonathan McCracken's Test-Drive Asp.NET MVC (great book , by the way) and I have stumbled upon a problem. Note that I'm using MVCContrib, Rhino and NUnit.</p> <pre><code> [Test] public void ShouldSetLoggedInUserToViewBag() { var todoController = new TodoController(); var builder = new TestControllerBuilder(); builder.InitializeController(todoController); builder.HttpContext.User = new GenericPrincipal(new GenericIdentity("John Doe"), null); Assert.That(todoController.Index().AssertViewRendered().ViewData["UserName"], Is.EqualTo("John Doe")); } </code></pre> <p>The code above always throws this error:</p> <blockquote> <p>System.AccessViolationException : Attempted to read or write protected memory. This is often an indication that other memory is corrupt.</p> </blockquote> <p>The controller action code is the following:</p> <pre><code>[HttpGet] public ActionResult Index() { ViewData.Model = Todo.ThingsToBeDone; ViewBag.UserName = HttpContext.User.Identity.Name; return View(); } </code></pre> <p>From what I have figured out, the app seems to crash because of the two assignements in the controller action. However, I cannot see how there are wrong!?</p> <p>Can anyone help me pinpoint the solution to this problem.</p> <p>Thank you.</p> <p><strong>Edit 1</strong></p> <p>I've done some experiments to see what the problem is. When removing the <code>ViewData,Model</code> assignment the problem transcends in <code>Expected result to be of type ViewResult. It is actually of type ViewResult.</code>. The <code>ViewData</code> assignment is so basic that I do not think that it is the problem so I think there is something wrong with either Rhino or MVCcontrib in conjunction with MVC 3.</p> <p>I also have the following test written earlier for the same controller action:</p> <pre><code> [Test] public void ShouldDisplayAListOfTodoItems() { Assert.That(((ViewResult)new TodoController().Index()).ViewData.Model, Is.EqualTo(Todo.ThingsToBeDone)); } </code></pre> <p>This one fails now with <code>System.NullReferenceException : Object reference not set to an instance of an object</code> probably becuase there's no HttpContext set up for this particular test. When removing the <code>ViewBag</code> assignment, everything is ok.</p> <p>Hope that makes the problem more clear.</p> <p><strong>Edit 2</strong></p> <p>When debugging the code after removing the <code>ViewData.Model</code> assignment, it throws a different error: <code>System.NullReferenceException : Object reference not set to an instance of an object.</code> on the <code>ViewBag</code> assignment.</p>
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    1. COOn which line exactly is the exception thrown and could you post the full stack trace?
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    2. COWell, it dies when I try to assign something into the ViewData. So, if I comment the two lines where I assign stuff to ViewData and ViewBag it does not die.
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