效果图：
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主要文件有Index.cshtml ,ErJLDController.cs ，还有数据库文件 。
1、首先在数据库中创建省级、城市的表，我的表如下：我用了一张表放下了省级、城市的数据，用level划分省份和城市，parentId表示该城市所在省份的id
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alt="" />
1 namespace Mvcproject.Controllers 2 { 3 //二级联动 4 public class ErJLDController : Controller 5 { 6 7 ZjbEntities db = new ZjbEntities(); 8 // 9 // GET: /Test/ 10 11 public ActionResult Index() 12 { 13 //pro_city province=new pro_city(); 14 15 return View(); 16 } 17 18 public JsonResult getProvince() { 19 20 List<pro_city> provinceList = (from p in db.pro_city where p.level == 1 select p).ToList(); 21 22 23 JsonResult Jprovince = new JsonResult(); 24 Jprovince.Data = provinceList; 25 Jprovince.JsonRequestBehavior = JsonRequestBehavior.AllowGet; 26 return Jprovince; 27 28 } 29 30 public JsonResult getCity(string pName) 31 { 32 33 //string pid = (from p in db.pro_city where p.areaValue == pName select p.id).ToString(); 34 //int id = int.Parse(pid); 35 int id = int.Parse(pName); 36 37 List<pro_city> cityList = (from p in db.pro_city where p.parentId == id select p).ToList(); 38 39 JsonResult Jcity = new JsonResult(); 40 Jcity.Data = cityList; 41 Jcity.JsonRequestBehavior = JsonRequestBehavior.AllowGet; 42 return Jcity; 43 44 } 45 46 } 47 }ErJLDController.cs
1 <body> 2 <div> 3 <select id="provinceId" > 4 <option> 请选择省份</option> 5 </select> 6 <select id="cityId"> 7 <option>请选择市区</option> 8 </select> 9 </div> 10 11 <script type="text/javascript"> 12 13 14 15 //用json从数据库里取一级列表的参数 16 $(function () { 17 18 $.getJSON("ErJLD/getProvince/", function (obj) { 19 $.each(obj, function (i, p) { 20 $("#provinceId").append("<option value='"+p.id+"'>" + p.areaValue + "</option>"); 21 }); 22 23 $("#provinceId").change(function () { 24 //用attr（）方法获取当前选择的option的value值（即p.id ,数据库里的id值， 25 //虽然在TestController中的getCity方法中传入的是string类型的形参，但是后来需要变换成int类型, 所以value值应该为数字） 26 var pName = $("#provinceId").attr("value"); 27 $.getJSON("ErJLD/getCity?pName=" + pName, getcity); 28 }); 29 }); 30 }); 31 32 33 34 35 function getcity(obj) { 36 $("#cityId").empty(); 37 $.each(obj, function (m, v) { 38 $("#cityId").append("<option >" + v.areaValue + "</option>"); 39 }); 40 41 }; 42 43 44 45 46 </script> 47 </body>Index.cshtml
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