MVC中如何使用DropDownList

var users=GetUsers();//获取所有用户
var selectList=new SelectList(users,"Age","Name","24");
ViewBag.list=selectList;

//cshtml使用
@Html.DropDownList("list")

//说明

列表:users

显示的选项:"Age"

选项对应的值:"Name"

默认选中的项为 值为"24"的记录

//控制器中用:

ViewBag.ProvinceId = Provinces.Select(o => new SelectListItem

{

Selected = o.ProName == "河南省" ? true : false,

Text = o.ProName,

Value = o.ProID.ToString()

});

//前端用:这样配合就会有默认值

@Html.DropDownList("ProvinceId")

List<SelectListItem> items = new List<SelectListItem>();
items.Add(new SelectListItem { Text = "Kirin", Value = "29" });
items.Add(new SelectListItem { Text = "Jade", Value = "28", Selected = true});
items.Add(new SelectListItem { Text = "Yao", Value = "24"});
ViewBag.list = items;

//在View中使用

@Html.DropDownList("list")

List<SelectListItem> items = new List<SelectListItem>();
items.Add(new SelectListItem { Text = "Kirin", Value = "29" });
items.Add(new SelectListItem { Text = "Jade", Value = "28"});
items.Add(new SelectListItem { Text = "Yao", Value = "24"});
ViewBag.list = items;
ViewBag.selected = 24;

//View中使用

@Html.DropDownList("selected", ViewBag.list as IEnumerable<SelectListItem>)

//说明

将ViewBag.list绑定为下拉框，然后从ViewBag获取key为selected的项，并将下list中Value值与该项的值相等的SelecteListItem设为默认选中项。

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

//view中使用

@Html.DropDownList("MovieType")