AccessViolationException was unhandled

Question

I'm attempting to use Steve Sanderson's blog post in order to edit a variable length list in my ASP MVC 3 view. The project builds fine, however whenever the partial view is rendered the program blows up on the using(Html.BeginColletionItem() line with this error:

AccessViolationException was unhandled
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

Here's a screen shot of the full exception

Complete stack trace below

at Microsoft.VisualStudio.WebHost.Host.ProcessRequest(Connection conn)
at Microsoft.VisualStudio.WebHost.Server.OnSocketAccept(Object acceptedSocket)
at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
at System.Threading.ThreadPoolWorkQueue.Dispatch()
at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()

Partial View

@model Monet.Models.AgentRelationshipCodes


@using (Html.BeginCollectionItem("AgentRelationshipCodes")) @*Exception thrown here*@
{
    <tr>
        <td>@Html.EditorFor(model => model.EffectiveDate, "NullableDate", new { @class = "relCodeDate2" })</td>
        <td>@Html.EditorFor(model => model.RelationshipId, "NullableDate", new { @class = "relDistCode1", maxlength = 3 })</td>
        @Html.HiddenFor(model => model.ID)
        @Html.HiddenFor(model => model.RelCodeOrdinal)
    </tr>
}

View

    <script>
    $(document).ready(function() {
        $(".addCode").click(function () {
                $.ajax({
                url: '@Url.Action("NewRelationshipCode", "AgentTransmission")',
                dataType: 'html',
                cache: false,
                success: function (html) {
                    console.log(html);
                    $("#Experiment > tbody").append(html);
                }
            })
        });
    });
    </script>
    .
    .
<fieldset>
    <legend>Relationship Codes</legend>
    <table id="Experiment">
        <thead>
            <tr>
                <th>Relationship Effective Date</th>
                <th>Relationship Dist Code</th>
            </tr>
        </thead>
        <tbody>
            @foreach (var item in Model.AgentRelationshipCodes)
            {
                @Html.Partial("AddRelationshipCodePartial", item)
            }
        </tbody>
    </table>
    <br/>
    <a href="javascript:void(0)" class ="addCode">Add Another</a>
</fieldset>

Controller

    [HandleProcessCorruptedStateExceptions]
    public ViewResult NewRelationshipCode()
    {
        return View("AddRelationshipCodePartial", new AgentRelationshipCodes());
    }

AgentRelationshipCodes

namespace Monet.Models
{
    using System;
    using System.Collections.Generic;

    public partial class AgentRelationshipCodes
    {
        public int ID { get; set; }
        public int RelCodeOrdinal { get; set; }
        public string RelationshipId { get; set; }
        public Nullable<System.DateTime> EffectiveDate { get; set; }
        public System.DateTime LastChangeDate { get; set; }
        public string LastChangeId { get; set; }

        public virtual AgentTransmission AgentTransmission { get; set; }
    }
}

EDIT

I've been able to get the demo working in a project outside the solution I'm using right now, so it apparently has to do with some dlls in this workspace. Now I'm above my paygrade, however, as I'm unsure how to debug something like this. Here are the exceptions that are identified by WinDbg prior to Visual Studio throwing the AccessViolationException. There is A LOT of information in between the exceptions being thrown, if that is needed by anyone please let me know.

*** WARNING: Unable to verify checksum for C:\Windows\assembly\NativeImages_v4.0.30319_32\mscorlib\d12f4fda3d1bfabf888342e96983e9a7\mscorlib.ni.dll
*** ERROR: Module load completed but symbols could not be loaded for C:\Windows\assembly\NativeImages_v4.0.30319_32\mscorlib\d12f4fda3d1bfabf888342e96983e9a7\mscorlib.ni.dll

*** WARNING: Unable to verify checksum for C:\Windows\assembly\NativeImages_v4.0.30319_32\System.Xaml\9d3572e8c3c314a0f12383d41e8bee78\System.Xaml.ni.dll
*** ERROR: Module load completed but symbols could not be loaded for C:\Windows\assembly\NativeImages_v4.0.30319_32\System.Xaml\9d3572e8c3c314a0f12383d41e8bee78\System.Xaml.ni.dll

*** WARNING: Unable to verify checksum for C:\Windows\assembly\NativeImages_v4.0.30319_32\Presentatio5ae0f00f#\8711b01d60a94d6ef6a02d7fd0578493\PresentationFramework.ni.dll
*** ERROR: Module load completed but symbols could not be loaded for C:\Windows\assembly\NativeImages_v4.0.30319_32\Presentatio5ae0f00f#\8711b01d60a94d6ef6a02d7fd0578493\PresentationFramework.ni.dll

*** WARNING: Unable to verify checksum for C:\Windows\assembly\NativeImages_v4.0.30319_32\WindowsBase\ac2e26bafa70e93b307087d7fe6b9dd2\WindowsBase.ni.dll
*** ERROR: Module load completed but symbols could not be loaded for C:\Windows\assembly\NativeImages_v4.0.30319_32\WindowsBase\ac2e26bafa70e93b307087d7fe6b9dd2\WindowsBase.ni.dll

*** WARNING: Unable to verify checksum for C:\Windows\assembly\NativeImages_v4.0.30319_32\Microsoft.V4e91a071#\207156ac71b58fb31310a2f78c3d0c44\Microsoft.VisualStudio.Web.Application.ni.dll
*** ERROR: Module load completed but symbols could not be loaded for C:\Windows\assembly\NativeImages_v4.0.30319_32\Microsoft.V4e91a071#\207156ac71b58fb31310a2f78c3d0c44\Microsoft.VisualStudio.Web.Application.ni.dll

UPDATE

By selecting the "Native Code" option in the project's Debuggers menu

I now receive a slightly more detailed error message:

Lastly, by switching to IIS Express as suggested below I am still receiving the AccessViolationException. Here are the settings I used to enable IIS for debugging (under project properties)

Here is the error message

Call stack:

Answer 1

Seems to me that you're working harder than you need to.

First, replace the foreach with a for loop, passing the indexed element into an editor template. This will establish your template context.

<fieldset>
    <legend>Relationship Codes</legend>
    <table id="Experiment">
        <thead>
            <tr>
                <th>Relationship Effective Date</th>
                <th>Relationship Dist Code</th>
            </tr>
        </thead>
        <tbody>
            @for (var i = 0; i < Model.AgentRelationshipCodes.Count(); i++)
            {
                @Html.EditorFor(model => model.AgentRelationshipCodes[i])
            }
        </tbody>
    </table>
    <br/>
    <a href="javascript:void(0)" class ="addCode">Add Another</a>
</fieldset>

Then create an editor template called AgentRelationshipCodes.cshtml (in Views/Shared/EditorTemplates)

@model Monet.Models.AgentRelationshipCodes
<tr>
    <td>@Html.EditorFor(model => model.EffectiveDate, "NullableDate", new { @class = "relCodeDate2" })</td>
    <td>@Html.EditorFor(model => model.RelationshipId, "NullableDate", new { @class = "relDistCode1", maxlength = 3 })</td>
    @Html.HiddenFor(model => model.ID)
    @Html.HiddenFor(model => model.RelCodeOrdinal)
</tr>

This eliminates the need for the custom helpers which are what appear to be causing the problem.

Lastly, for adding new elements - move the fieldset to a partial:

<script>
    $(document).ready(function() {
       $(".addCode").click(function () {
            $('#fieldset').load('@Url.Action("NewRelationshipCode", "AgentTransmission")',$('#fieldset').closest('form').serialize());
       });
    });
</script>

<div id="fieldset">
   @Html.Partial("fieldset");
</div>

And return the fieldset view from your NewRelationshipCode action method:

[HandleProcessCorruptedStateExceptions]
public ViewResult NewRelationshipCode(YourViewModel model)
{
    model.AgentRelationshipCodes.Add(new AgentRelationshipCodes());
    return View("fieldset", model);
}