1、下面代码包含了三种绑定DropDownList的方法
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;namespace SupermarketManagement.Controllers
{
public class HtmlControlsController : Controller
{
//单位枚举
public enum Units
{
米,
厘米,
毫米,
微米
} /// <summary>
/// DropDownList 控件
/// </summary>
/// <returns></returns>
public ActionResult DropDownListIndex()
{
//1、第一种表现形式(性别)
List<SelectListItem> sexItems = new List<SelectListItem>();
sexItems.Add(new SelectListItem { Text = "请选择", Value = "", Selected = true });
sexItems.Add(new SelectListItem { Text = "男", Value = "" });
sexItems.Add(new SelectListItem { Text = "女", Value = "" });
ViewBag.Sex = sexItems; //2、第二种表现形式
var values = Enum.GetValues(typeof(Units)).Cast<Units>();
var items = from value in values
select new SelectListItem { Text = value.ToString(),Value=value.ToString() };
ViewBag.Unit = items;//2.1 ViewBag.UnitEx = Units.米.ToSelectListItem("毫米");//2.2：这里用的扩展方法 //3、第三种表现形式选中(用户更新，展示)
List<SelectListItem> list = new List<SelectListItem>()
{
new SelectListItem(){Value="Man",Text="Man"},
new SelectListItem(){Value="Female",Text="Female"}
};
ViewBag.Gender = new SelectList(list, "Value", "Text","Female"); return View();
}
} //枚举扩展方法
public static class ExSelectListItem
{
/// <summary>
/// 显示所有列表
/// </summary>
/// <param name="valueEnum"></param>
/// <returns></returns>
public static IEnumerable<SelectListItem> 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;
} /// <summary>
/// 选中的列表项
/// </summary>
/// <param name="valueEnum"></param>
/// <param name="selectName"></param>
/// <returns></returns>
public static List<SelectListItem> 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();
}
}
}
2、Views 代码
<body>
<p>
一、第一种表现形式<br />
性别：@Html.DropDownList("Sex")
</p>
<p>
二、第二种表现形式<br />
单位：@Html.DropDownList("Unit")<br />
单位：@Html.DropDownList("UnitEx")
</p>
<p>
三、第三种表现形式<br />
性别：@Html.DropDownList("Gender")
</p>
</body>
3、结果：
