[MVC] EnumDropDownList

MVC 에서 Enum Type을 DropDownList에 바인딩 하는 코드이다.

1. public static class CommonUtil
2.     {
3.         private static readonly SelectListItem[] SingleEmptyItem = new[] { new SelectListItem { Text = "", Value = "" } };
4.  
5.         public static MvcHtmlString EnumDropDownListFor<TModel, TEnum>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TEnum>> expression, SelectListItem firstSelectItem)
6.         {
7.             ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
8.             Type enumType = GetNonNullableModelType(metadata);
9.             IEnumerable<TEnum> values = Enum.GetValues(enumType).Cast<TEnum>();
10.  
11.             TypeConverter converter = TypeDescriptor.GetConverter(enumType);
12.  
13.             IEnumerable<SelectListItem> items =
14.                 from value in values
15.                 select new SelectListItem
16.                 {
17.                     Text = converter.ConvertToString(value),
18.                     Value = value.ToString()
19.                 };
20.  
21.             if (metadata.IsNullableValueType)
22.             {
23.                 items = SingleEmptyItem.Concat(items);
24.             }
25.  
26.             
27.             if (firstSelectItem != null)
28.             {
29.                 firstSelectItem.Selected = true;
30.                 SelectListItem[] newItem = new SelectListItem[1];
31.                 newItem[0] = firstSelectItem;
32.                
33.                 items = newItem.Concat(items);
34.             }
35.                         
36.             MvcHtmlString html = htmlHelper.DropDownList("DDL" + metadata.PropertyName, items);
37.  
38.             return html;
39.         }
40.  
41.         
42.         private static Type GetNonNullableModelType(ModelMetadata modelMetadata)
43.         {
44.             Type realModelType = modelMetadata.ModelType;
45.  
46.             Type underlyingType = Nullable.GetUnderlyingTy

1. @Html.EnumDropDownListFor(model => model.EnumColor, new SelectListItem { Text = "--", Value = "" })