Mvc调用Api的显示、添加+二级联动

public List LoadShow(string Dname, int? Cid, int? Eid, int? Ctid, int pageindex, int pagesize, out int totalcount, out int totalpage)
        {
            var query = from a in mm.DeliveryInfos
                        join b in mm.Cities on a.Cid equals b.Cid
                        where b.Cityid == 0
                        join c in mm.Cities on a.Ctid equals c.Cid
                        where c.Cityid > 0
                        join d in mm.Expresses on a.Eid equals d.Eid
                        select new ViewModel
                        {
                            Cid = b.Cid,
                            Cname = b.Cname,
                            Cityid = b.Cityid,
                            Eid = d.Eid,
                            Ename = d.Ename,
                            Ctid = a.Ctid,
                            Did = a.Did,
                            Dname = a.Dname,
                            ImgCp = a.ImgCp,
                            Name = a.Name,
                            Phone = a.Phone,
                            Site = a.Site,
                            State = a.State
                        };
            if (!string.IsNullOrWhiteSpace(Dname))
            {
                query = query.Where(k => k.Dname.Contains(Dname));
            }
            if (Cid != null)
            {
                query = query.Where(k => k.Cid == Cid);
            }
            if (Eid != null)
            {
                query = query.Where(k => k.Eid == Eid);
            }
            if (Ctid != null)
            {
                query = query.Where(k => k.Cityid == Ctid);
            }
            totalcount = query.Count();
            totalpage = Convert.ToInt32(Math.Ceiling(totalcount * 1.0 / pagesize));
            return query.OrderBy(k => k.Did).Skip((pageindex - 1) * pagesize).Take(pagesize).ToList();

public int Add(DeliveryInfo d)
        {
            mm.DeliveryInfos.Add(d);
            return mm.SaveChanges();
        }

public List CityType(int Cityid)
        {
            return mm.Cities.Where(k => k.Cityid == Cityid).ToList();
        }

    class="table table-bordered">
        "background-color:coral;color:azure">
            "background-color:coral;color:azure">
                "tblist">
"8">产品发货管理
        
        

            
"8">
                产品名称 "text" id="Dname" />
                快递公司
                <select id="Express">
                    所有
                select>
                <select id="Province" onchange="Shi()">
                select>
                <select id="City">
                select>
                "button" value="查询" class="btn btn-info" onclick="Load()"/>
                "button" value="添加" class="btn" style="background-color:coral;color:azure"  />
            
        
            
产品名称
                
收货人
                
收货人手机
                
收货地址
                
快递公司
                
图片
                
状态
                
操作
            
        

    

"pageinfo">
"#" onclick="page(‘F‘)">首页
"#" onclick="page(‘P‘)">上页
"#" onclick="page(‘N‘)">下页
"#" onclick="page(‘L‘)">尾页

 function LodaAdd() {
        $.post(‘http://localhost:51198/api/Default/Add‘, {
            Dname: $("#Dname").val(),
            Name: $("#Name").val(),
            Phone: $("#Phone").val(),
            Cid: $("#Province").val(),
            Ctid: $("#City").val(),
            Site: $("#Site").val(),
            Eid: $("#Express").val(),
            ImgCp:"",
            State: $("[name=State]:checked").val()
        }, k => {
            if (k > 0) {
                alert("添加成功！");
                location.href = "/Mvc/Index";
            }
        })
    }

$(function () {
        Sheng();
        Express();
    })
    function Sheng() {
        $("#Province").append("请选择")
        $.get(‘http://localhost:51198/api/Default/CityType?Cityid=0‘, k => {
            $(k).each(function () {
                $("#Province").append(""+this.Cid+">" + this.Cname + "")
            })
        })
    }
    function Shi() {
        var id = $("#Province").val();
        $("#City").empty();
        $("#City").append("请选择")
        $.get(‘http://localhost:51198/api/Default/CityType?Cityid=‘ + id, k => {
            $(k).each(function () {
                $("#City").append("" + this.Cid + ">" + this.Cname + "")
            })
        })
    }