控制器post参数接收

public class TestController : ApiController
{
        [HttpPost]
        public string SaveData1(Tb_a ota)
        {
            return ota.aa.ID + ota.bb.FirstOrDefault().NAME;
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="ota"></param>
        /// <returns></returns>
        [HttpPost]
        public bool SaveData(Tb_a ota)
        {
            return true;
        }
}
 public class Tb_a
    {
        public TB_CHARGING aa { get; set; }
        public List<TB_CHARGING> bb { get; set; }
    }

var postData = { ID: "1", NAME: "Jim", CREATETIME: "1988-09-11" };
 var postData1 = [{ ID: "1", NAME: "Jim", CREATETIME: "1988-09-11" }, { ID: "1", NAME: "Jim", CREATETIME: "1988-09-11" }];
        
$.ajax({
                type: "post",
                url: ApiUrl + "api/Test/SaveData",
                data: { aa: { ID: "1", NAME: "Jim", CREATETIME: "1988-09-11" }, bb: [{ ID: "1", NAME: "Jim", CREATETIME: "1988-09-11" }, { ID: "1", NAME: "Jim", CREATETIME: "1988-09-11" }] },
                success: function (data, status) { }
            });


            $.ajax({
                type: "post",
                url: ApiUrl + "api/Test/SaveData1",
                data: { aa: postData, bb: postData1 },

                success: function (data, status) {
                    alert(data);
                }
            });