How do I specify which field should be displayed with MVC Scaffolding - entity-framework

Question

I am creating an MVC4 application using EF Code First database. I am working with some foreign key declarations. I wish to use define the field to display in the dropdown in the scaffolding in the model declarations. For instance:
My simplified model declaration is as follows:
public class Contact
{
public int ID { get; set; }
public string Prefix { get; set; }
public string First { get; set; }
public string Middle { get; set; }
public string Last { get; set; }
public string FullName
{
get { return (Last + ", " + First + " " + Middle).Trim(); }
}
}
public class Role
{
public int ID { get; set; }
public string RoleName { get; set; }
public string RoleDescription { get; set; }
}
public class RoleAssignment
{
[Key]
public int ID { get; set; }
[ForeignKey("Contact")]
public int Contact_ID { get; set; }
public virtual Contact Contact { get; set; }
[ForeignKey("Role")]
public int Role_ID { get; set; }
public virtual Role Role { get; set; }
}
I generate the standard scaffolding and the edit .cshtml looks like this:
<fieldset>
<legend>RoleAssignment</legend>
#Html.HiddenFor(model => model.ID)
<div class="editor-label">
#Html.LabelFor(model => model.Contact_ID, "Contact")
</div>
<div class="editor-field">
#Html.DropDownList("Contact_ID", String.Empty)
#Html.ValidationMessageFor(model => model.Contact_ID)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.Role_ID, "Role")
</div>
<div class="editor-field">
#Html.DropDownList("Role_ID", String.Empty)
#Html.ValidationMessageFor(model => model.Role_ID)
</div>
<p>
<input type="submit" value="Save" />
</p>
</fieldset>
However, the dropdown uses the "Prefix" field for the drop down and display. I want it to use the "FullName" field. How do I designate this in the Contact model declaration? (I know how to do this my modifying the .cshtml code, but I want it to work with pure generated code.)

Answer 1

OK. Figured it all out. To specify a custom naming field for your table for drop-downs, use the "DisplayColumn" on the model class, and then use the "NotMapped" attribute to prevent the custom display field from being mapped to the database, and give it a setter that does nothing:
[DisplayColumn("FullName")]
public class Contact
{
public int ID { get; set; }
[NotMapped]
[Display(Name = "Full Name")]
public string FullName
{
get { return (Last + ", " + First + " " + Middle).Trim(); }
}
public string Prefix { get; set; }
public string First { get; set; }
public string Middle { get; set; }
public string Last { get; set; } }

Answer 2

I have a partial answer to my question:
Adding the "DisplayColumn" attribute to the model class allows you to change the display field for the scaffolding as follows:
[DisplayColumn("First")]
public class Contact
{
public int ID { get; set; }
[Display(Name = "Full Name")]
public string FullName
{
get { return (Last + ", " + First + " " + Middle).Trim(); }
}
public string Prefix { get; set; }
public string First { get; set; }
}
However, it does not work with the read only field "FullName". Still trying to figure that one out...