与MVC3相比，差别很大：

表现形式一：

public ActionResult Main()        {            List
     
       items = new List
      
       ();            items.Add(new SelectListItem { Text = "Action", Value = "0" });            items.Add(new SelectListItem { Text = "Comedy", Value = "2" });            ViewBag.MovieType = items;            return View();        }
      
     

@Html.DropDownList("MovieType")

表现形式二：

public enum Unit{  吨,  堆,  捆}var values = Enum.GetValues(typeof(Unit)).Cast
     
      ();var items = from value in values           select new SelectListItem { Text = value.ToString(), Value = value.ToString()., Selected = value == Unit.堆 };
     

@Html.DropDownList("MovieType")

使用方法扩展：

/// 
/// 在MVC开发中我们常常用到枚举类型，通常枚举类型在使用中是是用DropDownList，每次转换不是什么好办法。 通过扩展加以实现此功能。/// 
public static class ExSelectListItem{ public static IEnumerable
     
       ToSelectListItem(this Enum valueEnum) {  var values = Enum.GetValues(valueEnum.GetType());  var result= from int value in values select new SelectListItem { Text =Enum.GetName(valueEnum.GetType(),value), Value = value.ToString() }; return result;   }   public static List
      
        ToSelectListItem(this Enum valueEnum, string selectName)   {     return (from int value in Enum.GetValues(valueEnum.GetType())             select new SelectListItem                    {                        Text = Enum.GetName(valueEnum.GetType(), value),                        Value = Enum.GetName(valueEnum.GetType(), value),                        Selected = Enum.GetName(valueEnum.GetType(), value) == selectName ? true : false                    }).ToList();        }    }
      
     

var items = Unit.堆.ToSelectListItem("捆");ViewBag.Unit = items;

表现形式三（编辑、更新有默认值）：

//下拉菜单            List
     
       list = new List
      
       ()            {                new SelectListItem(){Value="Man",Text="Man"},                new SelectListItem(){Value="Female",Text="Female"}            };            ViewBag.Gender = new SelectList(list, "Value", "Text",entity.Gender);
      
     

@Html.DropDownList("Gender", null, new { @class = "form-control" })