//省份public class Province{      public int ProvinceId{get;set;}      public string ProvinceName{get;set;}}//市public class City{      public int CityId{get;set;}      public string CityName{get;set;}  }//縣區public class District{      public int DistrictId{get;set;}      public string DistrictName{get;set;}}

//省public PartialViewResult GetProvince(int ProvinceId=0,int CityId=0,int DistrictId=0){      ViewData["provinceID"]=ProvinceId;      ViewData["cityId"]=CityId;      ViewData["districtId"]=DistrictId;      List<Province> listPro=獲取到省份的方法;              Return PartialView(listPro);  }//市public PartialViewResult GetCity(int ProvinceId=0,int CityId=0,int DistrictId=0){      if(ProvinceId==0)    {          ViewData["provinceID"]=0;          ViewData["cityId"]=0;          ViewData["districtId"]=0;          Return PartialView();      }    else    {          ViewData["provinceID"]=ProvinceId;          ViewData["cityId"]=CityId;          ViewData["districtId"]=DistrictId;          List<City> listPro=獲取到城市的方法(ProvinceId);                  Return PartialView(listPro);      }}        //縣區public ActionResult GetDistrict(int CityId=0,int DistrictId=0){     if(CityId==0)    {          ViewData["cityId"]=0;          ViewData["districtId"]=0;          Return PartialView();      }    else    {          ViewData["cityId"]=CityId;          ViewData["districtId"]=DistrictId;          List<District> listPro=獲取到縣區的方法(CityId);                  Return PartialView(listPro);      }}//省市聯動（異步刷新）///<summary>///根據傳值的省份Id加載出隸屬的城市///</summary>[HttpPost]public JsonResult AsynGetCity(){      string dealType=Request["GetCity"];      string id=Request["ID"];      List<City> listC=得到城市的方法(id);      return Json(listC);    }//市縣區聯動（異步刷新）///<summary>///根據傳值的城市id加載出隸屬的縣區///</summary>[HttpPost]public JsonResult AsynGetDistrict(){      string dealType=Request["GetDistrict"];      string id=Request["ID"];      List<District> listDis=獲取到縣區的方法(id);      return Json(listDis); }

@model List<Province><select id="ddlregions1" selectset="regions" name="ddlregions1"   onchange="getValue(this[selectedIndex].value)">      <option value="0">--請選擇--</option>          @foreach(var item in Model)      {           if((int)ViewDate["provinceID"]==item.ProvinceId)                  <option value="@ViewData["provinceID"]" selected="selected">@item.ProvinceName</option>           else                   <option value="@item.ProvinceId">@item.ProvinceName</option>          }    </select><span>省</span><!--市分布視圖-->@{Html.RenderAction("GetCity","Home",new {ProvinceId=ViewData["provinceID"],City=ViewData["cityId"],DistrictId=ViewData["districtId"]});}<!--Js--><!--Jquery引用。。。。。。。--><script>    function BindData(id,controlld)    {         $("#"+controlld).empty();         $("#"+controlld).append("<option value='0'>--請選擇--</option>");         $.Ajax({             type:"post",             url:"AsynGetCity",             dataType:"json",             data:{"dealType":"GetCity","ID":id},             success:function(result)             {                   $(result).each(function(){                        $("#"+controlld).append("<option value='"+this.CityId+"'>"+this.CityName+"</option>");                   })              }        })    }    $(function(){         $("#ddlRegions1").change(function(){              var id=$(this).val();              $("#ddlRegions3").empty();              $("#ddlRegions3").append("<option value='0'>--請選擇--</option>");              BindData(id,"ddlRegions2");         })    })</script>            

@model List<City><select id="ddlRegions2" onchange="getValue(this[selectedIndex].value)" selectset="regions">    @if((int)ViewData["ProvinceID"]==0)    {         <option value='0'>--請選擇--</option>    }else    {         <option value='0'>--請選擇--</option>         foreach(var item in Model)        {             if((int)ViewData["cityId"]==item.CityId || (int)ViewData["cityId"]==0)                  <option value="@ViewData["cityId"]" selected="selected">@item.CityName</option>             else                  <option value="@item.CityId">@item.CityName</option>        }    }</select><span>市</span><!--縣區-->@{Html.RenderAction("GetDistrict","Home",new{CityId=ViewData["cityId"],DistrictId=ViewData["districtId"]});}<!--Js--><!--jQuery引用--><script>    function BindData(id,controlld)    {        $("#"+controlld).empty();        $("#"+controlld).append("<option value='0'>--請選擇--</option>");        $.ajax({            type:"post",            url:"AsynGetDistrict",            dataType:"json",            data:{"dealType":"GetDistrict","ID":id}            success:function(result)            {                 $(result).each(function(){                      $("#"+controlld).append("<option value='"+this.DistrictId+"'>"+this.DistrictName+"</option>")                 })            }        })    }    $(function(){        $("#ddlRegions2").change(function(){              var id=$(this).val();              BindData(id,"ddlRegions3");        })    })</script>

@model List<District><select id="ddlRegions3" name="ddlRegions3" onchange="getValue(this[selectedIndex].value)" selectset="regions">    @if((int)ViewData["cityId"]==0)          <option value="0">--請選擇--</option>     else          <option value="0">--請選擇--</option>          @foreach(var item in Model)          {                if((int)ViewData["districtId"]==item.DistrictId)                    <option value="@ViewData["districtId"]">@item.DistrictName</option>                else                     <option value="@item.DistrictId">@item.DistrictName</option>          }</select>    <span>縣/區</span>