请教大牛ModelBinder的问题

[shizheng163]

项目架构是ASP.NET ,MVC4框架
现在问题是使用ajax传送json串到控制器,modelBinder没有正确绑定,小弟初学者,还请各位大牛多多指教。
请各位大侠指点迷津啊！！！

//控制器函数
[HttpPost]
        public ActionResult Insert(DB_BedType model,List<CG_ChargeStandard>Addlist)//插入只有addlist
        {
            string retMsg = "";
            bool ret = false;

            try
            {
                foreach (var info in Addlist)
                    _chargeStandardService.Add(info, out retMsg);
                ret = _bedTypeService.Add(model, out retMsg);
            }
            catch (Exception e)
            {
                retMsg = string.Format("发生错误:{0}", e.Message);
                Util.CLogServiceHandler.ErrorLogAdd(retMsg);
            }

            return Content(retMsg);
        }

//DB_BedType
public partial class DB_BedType
    {
        public int ID { get; set; }
        public string Code { get; set; }
        public string Name { get; set; }
        public string Remark { get; set; }
        public string Fk_ChargeType { get; set; }
       .....................//一些导航属性删掉了
    }

// CG_ChargeStandard
public partial class CG_ChargeStandard
    {
        public int ID { get; set; }
        public int Fk_BedType { get; set; }
        public System.DateTime EffectTime { get; set; }
        public decimal CostStandard { get; set; }
        public string Remarks { get; set; }
        public Nullable<decimal> DepositStandard { get; set; }
        public System.DateTime OperatorTime { get; set; }
        public string OperatorCode { get; set; }
    
        public virtual DB_BedType DB_BedType { get; set; }
    }

前台ajax 请求的json串

chrome浏览器开发者工具截取到的数据


前台js部分代码,中间有部分代码未用到,已删减

var postData = {};
var BedTypeJson = { 'ID': ID, 'Code': $code.val(), 'name': $name.val(), 'remark': $remark.val(), 'FK_ChargeType': $('#ChargeType').combobox('getValue') };
var Addlist = [];
 for (var i = 0; i < rows.length; i++) {
        var o = rows[i];
        if (o.waitOpeartor == 1) {
            var json = {
                Id: 0,
                Fk_bedType: ID,
                EffectTime: o.StartTime,
                CostStandard: o.HotelMoney,
                DepositStandard: o.DepositType
            };
            Addlist.push(json);
}
postData['model'] = BedTypeJson;
postData['Addlist'] = Addlist;
alert(JSON.stringify(postData));
    $.ajax({
        type: 'POST',
        url: url,
        dataType: 'text',
        data: postData,
        success: function (msg) {

            if (msg == '') {
                $("#DivAdd").dialog("close");
                $("#grid").datagrid("reload");
                $('#grid').datagrid('clearSelections');
                $('#grid').datagrid('clearChecked');
                $.messager.alert('系统提示', '操作成功！', 'info');
            }
            else {
                $.messager.alert('系统提示', "操作失败：" + msg, 'error');
            }
        }
    });

[wq1234wq]

你浏览器提交的是Json字符串 ,接收的Action的参数请用string类型，然后再用Json库将该Json字符串反序列化回来。