Value type field required in Razor View - asp.net-mvc-4

Question

I have an enum type field called Title.
[Serializable]
public enum Title
{
NotSet,
Miss = 4,
Mr = 1,
Mrs = 3,
Ms = 2
}
I want to bind a property of type Title to the Razor View but I don't want it to be a required field. However, on tabbing out or OnBlur, it is showing as required, although I have not specified this as required.
Is there any way I can get around this?

Answer 1

create
namespace YourApplicationName.Helper
{
public class ModelValueListProvider : IEnumerable<SelectListItem>
{
List<KeyValuePair<string, string>> innerList = new List<KeyValuePair<string, string>>();
public static readonly ModelValueListProvider TitleList = new TitleListProvider();
protected void Add(string value, string text)
{
string innerValue = null, innerText = null;
if (value != null)
innerValue = value.ToString();
if (text != null)
innerText = text.ToString();
if (innerList.Exists(kvp => kvp.Key == innerValue))
throw new ArgumentException("Value must be unique", "value");
innerList.Add(new KeyValuePair<string, string>(innerValue, innerText));
}
public IEnumerator<SelectListItem> GetEnumerator()
{
return new ModelValueListProviderEnumerator(innerList.GetEnumerator());
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
private struct ModelValueListProviderEnumerator : IEnumerator<SelectListItem>
{
private IEnumerator<KeyValuePair<string, string>> innerEnumerator;
public ModelValueListProviderEnumerator(IEnumerator<KeyValuePair<string, string>> enumerator)
{
innerEnumerator = enumerator;
}
public SelectListItem Current
{
get
{
var current = innerEnumerator.Current;
return new SelectListItem { Value = current.Key, Text = current.Value };
}
}
public void Dispose()
{
try
{
innerEnumerator.Dispose();
}
catch (Exception)
{
}
}
object System.Collections.IEnumerator.Current
{
get
{
return Current;
}
}
public bool MoveNext()
{
return innerEnumerator.MoveNext();
}
public void Reset()
{
innerEnumerator.Reset();
}
}
private class TitleListProvider : ModelValueListProvider
{
public TitleListProvider (string defaultText = null)
{
if (!string.IsNullOrEmpty(defaultText))
Add(string.Empty, defaultText);
Add(Title.NotSet, "NotSet");
Add(Title.Miss , "Miss");
Add(Title.Mr , "Mr");
Add(Title.Mrs , "Mrs");
Add(Title.MS, "MS");
}
public void Add(Title value, string text)
{
Add(value.ToString("d"), text);
}
}
}
}
in your model
public Title? Titleformation { get; set; }
public string[] SelectedTitle { get; set; }
in your view, also add the name space to your view
#using YourApplicationName.Helper;
#Html.ListBoxFor(m => m.SelectedTitle , new SelectList(ModelValueListProvider.TitleList, "Value", "Text"))
hope this help you

Answer 2

Enums require values, and cannot be null (aka not set) despite what someone commented above. What I do for salutations is have a "none" member of the enum, and whenever I print this out, I just check in the code to see if the value of the enum is > 0 (aka, the none option) and don't print it.
public enum Salutation { none,
[Description("Mr.")] Mr,
[Description("Mrs.")] Mrs,
[Description("Ms.")]Ms,
[Description("Miss")] Miss }

Answer 3

Use a class rather than enum ie:
public class Title
{
NotSet;
Miss = 4;
Mr = 1;
Mrs = 3;
Ms = 2;
}