public static HtmlString DropDownEnumFor <TModel, TValue>(this HtmlHelper <TModel> helper,
Expression <Func <TModel, TValue> > expression, SelectListItem defauItem = null, object htmlAttributes = null)
{
var typeOfProperty = expression.ReturnType;
if (!typeOfProperty.IsEnum)
{
throw new ArgumentException(string.Format("Type {0} is not an enum", typeOfProperty));
}
//getting the enum that is defined..
int?value = (int)ModelMetadata.FromLambdaExpression(expression, helper.ViewData).Model;
// if (Enum.IsDefined(typeOfProperty, expression))
// {
// defaultValue = (int)ModelMetadata.FromLambdaExpression(expression, helper.ViewData).Model;
// }
var enumValues = new List <SelectListItem>();
if (defauItem != null) //adding the default value before anything else...
{
if (value == null)
{
defauItem.Selected = true;
}
enumValues.Add(defauItem);
}
//retrieves the elements..
enumValues.AddRange(Enum.GetValues(typeOfProperty).Cast <Enum>().Select(x => new SelectListItem()
{
Value = (Convert.ToInt32(x)).ToString(),
Text = GeneralHelper.GetEnumDescriptionIrName(x),
Selected = ((int)value) == (Convert.ToInt32(x))
}));
// var selecteItem = defaultValue != null
// ? enumValues.FirstOrDefault(x => Convert.ToInt32(x.Value) == defaultValue)
// : enumValues.First();
return(helper.DropDownListFor(expression, enumValues, htmlAttributes: htmlAttributes));
}
public IList<SelectListItem> SelectListItemGenerator<T>(bool descriptorAsText = true, bool intAsValue = true)
where T : struct, IConvertible
{
if (!typeof (T).IsEnum)
{
throw new ArgumentException("T must be an enumerated type");
}
//now doing the rest of the work...
IEnumerable<Enum> listElments = Enum.GetValues(typeof (T)).Cast<Enum>();
return listElments.Select(a => new SelectListItem
{
Text = descriptorAsText ? _generalHelper.GetEnumDescriptionIrName(a) : a.ToString(),
Value = intAsValue ? (Convert.ToInt32(a)).ToString() : a.ToString()
}).ToList();
}
