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本篇实现中国省市区三级联动，先看最终效果：
初始状态:
当选择第1个Select,第2、3个Select可供选择：
当选择第２个Select,第１个不变、第3个Select可供选择：
当选择第３个Select,第１、２个不变：
下面是代码：
控制器Controllers\HomeController.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using 省市区__三级联动.Models;
namespace 省市区__三级联动.Controllers
{
public class HomeController : Controller
{
//
// GET: /Home/
[HttpGet] //刚开始加载页面的时候
public ActionResult Index()
{
//省份 根据编号0001查的就是省份
List<ChinaStates> listsheng = new ChinaDA().SelectBysheng("0001");
ViewBag.shengs = new SelectList(listsheng, "AreaCode", "AreaName");
List<ChinaStates> listshi = new ChinaDA().SelectByshi("11");
ViewBag.shis = new SelectList(listshi, "AreaCode", "AreaName");
List<ChinaStates> listqu = new ChinaDA().SelectByqu("1101");
ViewBag.qus = new SelectList(listqu, "AreaCode", "AreaName");
return View();
}
[HttpPost]
public ActionResult Index(string sheng, string shi, string qu)
{
List<ChinaStates> listsheng = new ChinaDA().SelectBysheng("0001");
ViewBag.shengs = new SelectList(listsheng, "AreaCode", "AreaName",sheng);
List<ChinaStates> listshi = new ChinaDA().SelectByshi(sheng);
ViewBag.shis = new SelectList(listshi, "AreaCode", "AreaName",shi);
var b = listshi.Exists(P => P.AreaCode == shi) ? shi : listshi[0].AreaCode;
List<ChinaStates> listqu = new ChinaDA().SelectByqu(b);
ViewBag.qus = new SelectList(listqu, "AreaCode", "AreaName");
return View();
}
}
}
模型:
首先要用linq连接数据库 然后建一个类开始写方法
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace 省市区__三级联动.Models
{
public class ChinaDA
{
private ChinaDataContext _Context = new ChinaDataContext();
public List<ChinaStates> Select()
{
return _Context.ChinaStates.ToList();
}
public List<ChinaStates> SelectBysheng(string AreaCode)
{
var query = _Context.ChinaStates.Where(p => p.ParentAreaCode == AreaCode);
return query.ToList();
}
public List<ChinaStates> SelectByshi(string AreaCode)
{
var query = _Context.ChinaStates.Where(p => p.ParentAreaCode == AreaCode);
return query.ToList();
}
public List<ChinaStates> SelectByqu(string AreaCode)
{
var query = _Context.ChinaStates.Where(p => p.ParentAreaCode == AreaCode);
return query.ToList();
}
}
}
视图:
@using 省市区__三级联动.Models
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Index</title>
</head>
<body>
@using (Html.BeginForm("Index", "Home", FormMethod.Post))
{
<div>
@Html.DropDownList("sheng",ViewBag.shengs as SelectList,new { onchange="document.forms[0].submit();"})
@Html.DropDownList("shi",ViewBag.shis as SelectList, new { onchange="document.forms[0].submit();"})
@Html.DropDownList("qu",ViewBag.qus as SelectList)
</div>
}
</body>
</html>
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原文地址：http://www.cnblogs.com/Mr-xue/p/4636244.html
