LabelFor incorrect when using AllowHtml

Question

I'm using MVC 5.2.2.0, .net 4.5.1 and I'm seeing some odd behavior. I have a model like so:

public class Program
{
    // .... Other Properties 

    [Display(Name = "Courses Description")]
    [RichText]
    [AllowHtml]
    public string CoursesDescription { get; set; }

    // .... Other Properties
}

RichText is a custom attribute:

[AttributeUsage(AttributeTargets.Property)]
public class RichText : Attribute
{
    public RichText() { }
}

All it is used for is to tell the T4 template to add the wysi data-editor attribute to the TextAreaFor html helper.

My view has the following:

 <div class="form-group">
     @Html.LabelFor(model => model.CoursesDescription, htmlAttributes: new { @class = "control-label col-sm-3" })
     <div class="col-sm-6">
         @Html.TextAreaFor(model => model.CoursesDescription, 10, 20, new { @class = "form-control", data_editor = "wysi" })
         @Html.ValidationMessageFor(model => model.CoursesDescription, "", new { @class = "text-danger" })
     </div>
 </div>

With the AllowHtml attribute, the View renders like this:

However, if I modify the model by removing the AllowHtml attribute, the view renders correctly.

public class Program
{
    // .... Other Properties 

    [Display(Name = "Courses Description")]
    [RichText]
    public string CoursesDescription { get; set; }

    // .... Other Properties
}

It is also worth pointing out that removing the RichText attribute doesn't change anything, the View still ignores the Display attribute.

Any ideas why AllowHtml is interfering with LabelFor?

Answer 1

Digging deeper into this, I noticed that my MVC project was using MVC 5.2.2.0, but I had inadvertently installed MVC 5.2.3.0 for my models project.

Downgrading the models project to 5.2.2.0 fixed the problem.